UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

FORM 10-K

Commission File No. 0-22166

AETRIUM INCORPORATED

2350 Helen Street
North St. Paul, Minnesota 55109
(Address of principal executive offices) (Zip code)

Registrant’s telephone number, including area code: (651) 770-2000
Securities registered pursuant to Section 12(b) of the Act: None
Securities registered pursuant to Section 12(g) of the Act: Common Stock, $.001 par value

     Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES þ NO o

     Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K o.

     Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act). YES o NO þ

     The aggregate market value of the Registrant’s Common Stock held by non-affiliates, computed by reference to the price at which the Common Stock was last sold as of June 30, 2004, which is the last business day of the Registrant’s most recently completed second fiscal quarter, as reported by The Nasdaq Stock Market was $68,161,000.

     As of March 16, 2005, 9,629,123 shares of Common Stock of the Registrant were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

     Part III of this Annual Report on Form 10-K incorporates by reference information (to the extent specific sections are referred to herein) from the Registrant’s definitive Proxy Statement for its 2005 Annual Meeting of Stockholders to be held May 25, 2005 (the “2005 Proxy Statement”).

Form 10-K

For the fiscal year ended December 31, 2004

TABLE OF CONTENTS

(i)

PART I

     This Form 10-K contains certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. For this purpose, any statements contained in this Form 10-K that are not statements of historical fact may be deemed to be forward-looking statements. Without limiting the foregoing, words such as “may,” “will,” “expect,” “believe,” “anticipate,” “estimate” or “continue” or comparable terminology are intended to identify forward-looking statements. These statements by their nature involve substantial risks and uncertainties, and actual results may differ materially depending on a variety of factors, including those set forth under the heading “Business Risks and Uncertainties” located in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” under Item 7 below. We undertake no obligation to correct or update any forward-looking statements, whether as a result of new information, future events or otherwise. You are advised, however, to consult any future disclosures we may make on related subjects in future filings with the SEC. References in this Form 10-K to “Aetrium,” “the company,” “we” and “our,” unless the context otherwise requires, refer to Aetrium Incorporated and its consolidated subsidiaries and their respective predecessors.

ITEM 1. BUSINESS.

Overview

     We design, manufacture and market a variety of electromechanical equipment used in the handling and testing of semiconductor and passive electronic devices, such as integrated circuits, or ICs, and discrete electronic components. Our primary focus is on high volume IC device types and on the latest device package designs. Our products are purchased primarily by semiconductor manufacturers and their assembly and test subcontractors. Our products are used in the test, assembly and packaging, or TAP, segment of semiconductor manufacturing (in which we include the manufacture of both semiconductor and passive electronic devices). Our products automate critical functions to improve manufacturing yield, raise quality levels, increase product reliability and reduce manufacturing costs.

     We have three principal equipment product lines:

	•	Test Handler Products. In terms of revenue, this is our largest product line. Our broad line of test handler products incorporates thermal conditioning, contacting and automated handling technologies to provide automated handling of ICs and discrete electronic components during production test cycles. We also offer change kits to adapt our test handlers to different device package configurations or to upgrade installed equipment for enhanced performance. Change kits represent a significant part of our revenue.
	•	Semiconductor Automation Products. Most of our semiconductor automation products are sold to semiconductor manufacturers and their subcontractors, and are used to automate the loading and unloading of burn-in boards. The rest of our semiconductor automation products are sold to original equipment manufacturers, or OEMs, to be incorporated as the automated handling components of such OEMs’ own proprietary equipment for a variety of other IC processing requirements, such as marking, lead scanning, and lead trim and form.
	•	Reliability Test Equipment. The primary focus of our reliability test products is to provide IC manufacturers with structural performance data to aid in the evaluation and improvement of IC designs and manufacturing processes to increase IC yield and reliability.

     Test handler products accounted for 56%, 52% and 51% of our net sales in 2004, 2003 and 2002, respectively. Semiconductor automation products accounted for 6%, 11% and 8% of our net sales in 2004, 2003 and 2002, respectively. Reliability test equipment accounted for 21%, 20% and 18% of our net sales in 2004, 2003 and 2002, respectively. Change kits and spare parts accounted for 17%, 17% and 23% of our net sales in 2004, 2003 and 2002, respectively.

     2004 was a year of transitions in the TAP segment of the semiconductor equipment industry. In the first half of 2004, fueled by increasing demand for semiconductors, revenue for the TAP segment of the semiconductor equipment industry increased approximately 80% over that of the same period in 2003, according to Semiconductor Equipment and Materials International, or SEMI, reporting on North American semiconductor equipment manufacturers. However, the semiconductor industry and its distribution channels took quick and strong action in the second half of 2004 to address growing and excess inventories. As a result, revenue for the TAP segment of the semiconductor equipment industry decreased in the second half of 2004, although revenue for the year was approximately 45% higher than for 2003, as reported by SEMI on the same companies. Our results were similar in pattern, although more pronounced. Our revenues for the first half of 2004 increased approximately 140% over that of the same period in 2003, as we enjoyed strong demand across our product lines. Demand for our products lessened considerably, however, in the second half of 2004, as our customers experienced the same market conditions as the rest of the semiconductor industry. Nevertheless, our revenue for all of 2004 increased 97% over that of 2003, our operations were profitable in each quarter of 2004, and our ending cash position for 2004 increased by more than $3,000,000 over 2003. In addition, we continued our product development efforts throughout 2004, which were focused on the newest and fastest growing IC package types and the latest semiconductor processes. We ended the year having made substantial progress on pivotal customer evaluations of our newest product introductions.

     There are many and varied projections offered by analysts of the semiconductor and semiconductor equipment industries as to how 2005 will proceed for those industries. Our customers offer us little visibility into the demand for our products in 2005 as they continue to react very conservatively to the flattened semiconductor industry market conditions. We believe we are positioned to take full advantage of the industry conditions however they develop because of our cost structure, our newer product introductions that led our strong growth in the first half of 2004, our newest product introductions that we believe will open new markets for us, and our strong working capital position.

     All of our product development and manufacturing activities are conducted at either our North St. Paul, Minnesota or Dallas, Texas facilities. We manufacture products within each of our principal product lines at both of these facilities.

Background

     Our strategy has focused on revenue growth through product line expansion, by both internally developing and acquiring complementary technologies, businesses, or product lines.

     In 1998, we acquired the equipment business of WEB Technology, Inc. The primary products we acquired were semiconductor automation products used to automate the loading and unloading of burn-in boards. This equipment can be configured to accommodate any burn-in board currently being manufactured. We manufacture this equipment at our Dallas operations.

     In 1997, we completed two acquisitions that expanded our test handler product lines. In November 1997, we acquired a product line of pick-and-place test handlers from Advantek Inc. This acquisition extended our product line of pick-and-place test handlers for non-memory analog and logic IC devices. We manufacture the product line acquired from Advantek at our North St. Paul operations.

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     In April 1997, we acquired a line of turret based test handler products through our purchase of the assets of Forward Systems Automation, Inc., which we have since expanded and advanced through internal product development. This line of test handlers addresses discrete electronic components and small ICs, including the fastest growing and newest IC package types. We manufacture this product line at our Dallas operations.

     In December 1995, we acquired the assets of E.J. Systems, Inc. Through this acquisition, we obtained some early stage conductive thermal core technology that we have further developed and transferred to our North St. Paul operations.

     In November 1994, we acquired the assets of Sym-Tek Systems, Inc., which expanded our presence in the memory IC market, and also extended our line of gravity feed test handlers for non-memory IC test handler applications. We have since discontinued the products for non-memory applications. In the fourth quarter of 2000, we also decided to exit the highly volatile handler market for memory applications. However, through this acquisition we obtained core pick-and-place and in-tray handling technologies, which we further developed and transferred to our North St. Paul operations.

     In December 1993, we originated our reliability test systems product line through the purchase of the assets of Sienna Technologies, Inc. Since the acquisition, we have developed and introduced a new generation product line that has been well received by a growing customer base. Our reliability test products are primarily manufactured at our North St. Paul operations.

     In April 1988, we acquired the core products of our 5050 series of gravity feed test handlers through our acquisition of Electro-Mechanical Systems, Inc. Since then, through internal development we have expanded this series of products and developed and introduced the 55V6 and 55V8 series of gravity feed test handlers. All of these series of test handlers include a full range of thermal conditioning capabilities, contactors and change kits for a wide range of IC package types. We sell these products into the largest and fastest growing IC market segments. We manufacture our gravity feed test handlers at our North St. Paul operations.

     We were incorporated in Minnesota in December 1982. Our executive offices are located at 2350 Helen Street, North St. Paul, Minnesota 55109. Our telephone number is (651) 770-2000. Our web site address is www.aetrium.com. We make available free of charge through our website our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and all amendments to those reports, as soon as is reasonably practicable after such material is electronically filed with or furnished to the SEC. Our website is not intended to be a part of, nor are we incorporating it by reference into, this Annual Report on Form 10-K.

Financial Information About Segments

     Since our inception, we have operated in the single industry segment of supplying electromechanical equipment to the semiconductor industry. Our financial results are set forth in Items 6 and 15 of this Annual Report on Form 10-K.

Test Handler Products

     Test handlers are electromechanical systems interfaced with a tester to form a test system designed to handle, thermally condition, contact and sort ICs and discrete electronic components automatically during the final test stage of the manufacturing process. The devices are loaded into the handler from bowls, tubes or trays and then, if required, transported to a temperature chamber within the test handler where they are

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thermally conditioned and controlled to the required testing temperature. The devices are then placed into a contactor, which provides an electrical connection between the device and the tester. After testing, the test handler sorts the devices according to test performance as provided by the tester. In some cases, additional process steps are completed by the test handler system. These include marking or inspection of the device packages, and automatic placement of the devices into a tube, tray or tape for shipment to the end user. Test handlers must meet industry criteria for thermal conditioning, contactor integrity and minimization of damage to the device during the test handling cycle.

     ICs are multi-function semiconductor devices that may contain millions of individual transistors, and include microprocessors, microcontrollers, digital signal processors and memory devices. ICs come in a wide range of sizes and package types, depending upon their application. Discrete electronic components are single function semiconductor devices, such as transistors and diodes, and passive electronic devices, such as resistors and capacitors. They are typically very small and are manufactured in several package types.

     In the testing of ICs and discrete electronic components, the device package type being tested often dictates the type of test handler used. Small outline packages, or SOPs, constituting the largest IC package segment, have leads, or electrical contacts, extending from two sides and are typically tested with gravity feed test handlers. Micro leadless packages, or MLPs and sometimes referred to as MLF ^TM s, SONs or QFNs, have electrical contact pads flush with the sides and bottoms of the ICs and are typically tested with gravity feed or turret based test handlers. MLPs constitute one of the fastest growing new IC package types.

     More complex ICs are sometimes packaged in the IC package families more easily damaged in handling. These package families are typically tested with pick-and-place test handlers. More fragile IC package types include QFPs, BGAs, PGAs, some CSPs and the most fragile SOP packages. QFPs, or quad flat packs, have leads extending from all four sides. BGAs, or ball grid array packages, have bumped leads on the bottom of the package. PGAs, or pin grid arrays, have pin type leads extending from the bottom of the package. CSPs, or chip scale packages, are a category of some of the smallest IC packages, with package sizes being no more than 1.2 times the size of the IC die within.

     Discrete electronic component package types include small outline transistor packages, or SOTs, which are also sometimes used for the smallest ICs. Discrete electronic component package types are typically tested with turret based test handlers.

     Our primary focus continues to be on the newest device and package types, and the largest volume and fastest growing markets, in the IC side of the semiconductor industry. We believe we offer the broadest line of test handling products to the semiconductor industry, addressing the full spectrum of non-memory device types, device package types and media transport types. Our test handler products are complementary with minimal overlap of application, and we distribute and service them through a common organization for efficiency.

     Gravity Feed Test Handlers

     Traditionally, test handlers have used gravity to move ICs from tubes through the handler system and back into tubes. Typically, in gravity feed systems ICs are halted at necessary points in the handling process by colliding against other ICs or other stopping mechanisms, which can result in lead damage to more fragile IC packages. Accordingly, gravity feed handlers are best suited for more rugged IC packages, which include MLPs and most SOPs.

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     Our gravity feed test handlers compete most favorably in high-volume applications and their high throughput rates are an added advantage in relatively short test time applications. These handlers adapt to “plunge-to-board”-type contacting and third party contactors, as well as our internally developed proprietary contactors, providing cost-effective solutions to a wide range of customer test requirements. In “plunge-to-board”-type contacting, the IC is placed directly against the test head with no intermediary sockets or connections, which is particularly well suited for high performance ICs. Our gravity feed test handlers can heat or cool the ICs being tested to any test temperature from -55 degrees C to +155 degrees C. They use mechanical refrigeration to cool ICs, which is more economical than liquid nitrogen, commonly used as a refrigerant in competing handlers. Our dual and quad site gravity feed test handlers can simultaneously test devices in each of their sites to increase productivity and reduce testing costs in certain applications. Our principal gravity feed test handlers include:

	•	55V6 Series. First introduced in 2002, our 55V6 Series of single and dual site gravity feed test handlers for analog and logic IC applications addresses a wide range of IC packages, including SOPs and MLPs. The 55V6 Series offers a small footprint, a vertical backplane that can accommodate any size of test head, and our high speed test site actuator that we believe offers significant throughput advantages over our competition, depending upon device test times and thermal conditioning requirements.
	•	55V8 Series. Our newly developed 55V8 Series of quad site gravity feed test handlers for analog and logic IC applications addresses a wide range of IC packages, including SOPs and MLPs. The 55V8 Series offers the advantages of the 55V6 Series, including our high speed test site actuator. We completed our first sales of the 55V8 Series in the fourth quarter of 2004.
	•	5050 Series. Our 5050 Series of gravity feed test handlers for analog and logic IC applications addresses a wide range of SOP package types. In addition to single test site capability, we offer dual test site and quad test site capability within our 5050 Series of handlers.

     Turret Based Test Handlers

     Turret based test handlers have a series of pickup heads that rotate around a fixed axis and move devices from station to station. They are typically configured for bowl feed input and tape and reel output, although they can be configured for tube or tray input and tube or tray output. One or more stations on turret based handlers are used for testing ICs and discrete electronic components. Stations on turret based handlers can also be used for additional process steps such as marking and inspection. Turret based handlers are well suited for discrete electronic components and smaller ICs that are difficult to handle in gravity feed handlers because of their size and small mass, and are well suited for MLPs because MLPs can be handled in bulk. Turret based handlers are typically more costly than gravity feed handlers, but typically offer higher throughput rates than gravity feed handlers.

     Our turret based test handlers are designed for high volume testing of discrete electronic component packages and ICs in MLP, CSP and SOT packages. These test handlers can integrate several functions, including test, laser marking, mark inspection, lead inspection, and tape and reel output. They can be configured for a variety of options for contacting, including “plunge-to-board”-type contacting. These test handlers are typically configured for bowl feed input and tape and reel output. Our principal turret based handlers include:

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Model 5800. We introduced the Model 5800 Small Component Integrated Test Handler in 2000. It has eight stations, and can be configured for up to four test sites. It operates at temperatures ranging from ambient to +150 degrees C, and can be configured for tube input and tube output. The Model 5800 can achieve throughputs of up to 16,000 devices per hour.

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•

Model 8832. We introduced the Model 8832 Small Component Integrated Test Handler in 2000. It has 32 stations, which provide a high degree of flexibility in integrating additional device process functions into the handler. It can be configured for up to eight test sites and, optionally, for tube or tray input and tube or tray output. The Model 8832 is capable of throughputs of up to 24,000 devices per hour.

     Pick-and-Place Test Handlers

     Pick-and-place test handlers move ICs by “picking” up each device and “placing” the device to the appropriate position, similar to a robot. The motions avoid sliding contact and jarring stops that can potentially result in lead damage to some package types. Thus, pick-and-place test handlers can handle a wide variety of packages, including the IC package families most easily damaged in handling.

     Our pick-and-place test handlers can be configured for a wide variety of analog and logic ICs in SOP, QFP, BGA, CSP and PGA packages. Using a conventional thermal chamber technique, these handlers can heat or cool the devices being tested to any test temperature from -55 degrees C to +155 degrees C. These handlers are configured and equipped to safely and reliably handle the most fragile IC packages. Devices are transported with their leads up, virtually eliminating the possibility of lead damage. These handlers feature “plunge-to-board”-type contacting, and can be modified with change kits, typically within 15 minutes, to accommodate nearly every IC package configuration being manufactured in volume today. Our principal pick-and-place handlers include:

	•	Model 3000. The Model 3000 test handler is a dual site pick-and-place test handler, which allows for significantly increased throughput for dual site applications, as compared to single site test handlers.
	•	Model 1400. The Model 1400 is a single site pick-and-place test handler.

     Change Kits, Upgrades and Spare Parts

     We have an ongoing demand for IC and discrete electronic component package change kits for our installed test handler products, including test handlers no longer in our active product lines. We sell a variety of change kits to accommodate the growing variety of device packages used in the semiconductor industry. The demand for change kits is driven by the introduction of new device package types and increased production volumes experienced by our end customers. Also included in change kits are upgrade kits to enhance the performance of installed equipment. We sell spare parts with new orders as kits or separately as piece parts or in kit form as required.

Semiconductor Automation Products

     We have applied our core automation technologies to extend our product lines to other applications of automation of the handling of ICs and discrete electronic components.

     4800 Series Burn-in Board Loaders/Unloaders

     Our 4800 Series is a line of products used to automate the loading and unloading of burn-in boards. Burn-in boards vary in size and density, and are used to place individual ICs into a convection oven for an extensive reliability screening and stress testing procedure known as “burn-in.” Our burn-in board automation products take untested ICs out of trays or other media and place them into sockets on a burn-in board. After the burn-in test is complete, the 4800 Series system unloads and removes ICs that have completed the burn-in cycle from the burn-in board

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sockets and sorts the ICs according to the results of the test as provided by the burn-in system. The burn-in process screens for early failures by operating the IC at elevated voltages and temperatures, usually at 125 degrees C, for periods typically ranging from 12 to 96 hours. Burn-in systems can process thousands of ICs simultaneously, utilizing multiple boards. Most leading-edge microprocessors, digital signal processors, and memory ICs undergo burn-in testing.

     Our 4800 Series comes in single pick-up head, dual-head, five-head, ten-head and our newly introduced sixteen-head versions. The single and dual head models are best suited for large IC packages or for those applications requiring a quick conversion of the 4800 Series system to handle a different IC package. The five-head, ten-head and sixteen-head systems are best suited to very high volume memory applications. Our new sixteen-head version offers significant throughput advantage over other versions and is currently in evaluation and verification process at a key customer. All versions are available with a variety of input and output options, including tubes and trays. Package positioning stations ensure device alignment into sockets and output media. An optional stacked burn-in board elevator and trolley allows the system to process up to 32 burn-in boards without any operator intervention.

     Automation Modules Product Line for OEMs

     We market our Automation Modules product line to a limited number of other semiconductor equipment manufacturers to provide automation for their semiconductor process equipment for a variety of other IC processing requirements, such as marking, lead scanning, and lead trim and form. Our revenues from our Automation Modules product line were severely impacted by the record industry downturn in 2001-2003 as our OEM customers experienced the same business conditions that we were experiencing. As products incorporating our Automation Modules continue to age, we expect that future revenues from this product line will be increasingly dependent upon our success in our OEM customers incorporating Automation Modules into their new product introductions. Sales of Automation Modules represented less than 3% of our revenue in 2004. Currently we are not engaged in any material efforts to develop new applications for our Automation Modules. As a result, we do not expect revenue growth from this product line.

Reliability Test Equipment

     The IC industry’s demand for higher performance devices through smaller circuit geometries has led to significant technological changes in the materials and processes used to manufacture ICs, including a continuing migration to copper materials for the increasingly minute circuitry of devices. These changes in technology, along with IC user demand for increased reliability, have created a need for increasingly sophisticated reliability testing of IC designs and manufacturing processes. Our reliability test equipment product line enables IC manufacturers to force and measure precise levels of voltage and current through ICs, collect and analyze relevant data, and predict lifetime performance of ICs. This equipment can be utilized to perform reliability testing of packaged and unpackaged ICs.

     In 1998, we introduced our 1164 Series of reliability test equipment, including a suite of applications for customers to perform a variety of tests. We have since added many new features, including the full reliability test functionality necessary for testing an IC manufacturer’s entire copper process. The 1164 Series features a modular design that allows for great flexibility in performing reliability tests, and can test up to 4,096 devices at a time and perform numerous simultaneous tests on batches of ICs. 14 of the top 20 semiconductor manufacturers in the world are using our 1164 Series of reliability test equipment for copper and related advanced process technologies.

     Our reliability test products also include a line of products designed to test over-voltage protection devices for telecommunications applications.

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Competition

     The semiconductor capital equipment market is highly competitive. In the market for test handler products, we compete with a number of companies ranging from very small businesses to large companies, some of which have substantially greater financial, manufacturing, marketing and product development resources than we have. Some of these companies manufacture and sell both testers and test handlers. The particular companies with which we compete vary with our different test handler product lines, with no one company dominating the overall test handler market. The companies with which we compete most directly in the test handler market include Multitest Electronic Systems GmbH, Rasco AG, Ismeca S.A., SRM Technology (M) Sdn Bhd, Tesec Corporation and Cohu, Inc.

     We compete for test handler sales primarily on the basis of effective handler throughput, cost of ownership, temperature accuracy and other performance characteristics of our products, the breadth of our product lines, the effectiveness of our sales and distribution channels and our customer relationships. We believe we compete favorably on all of these factors.

     The market for burn-in board automation products is highly competitive. We compete with a number of companies ranging from very small businesses to large companies, some of which have substantially greater financial, manufacturing, marketing and product development resources than we have. The companies with which we compete most directly in this market include Cohu, Inc., Racal Instruments and Todo Seisakusho, Ltd.

     We compete for burn-in board automation product sales primarily on the basis of effective throughput, cost of ownership, versatility, and other performance characteristics of our products, the breadth of our product line, the effectiveness of our sales and distribution channels and our customer service. We believe we compete favorably on all of these factors.

     We believe that the market for our Automation Modules sold on an OEM basis has no clearly defined commercial competitors offering similar automated handling modules to the IC equipment industry. Historically, OEMs supplying equipment for IC manufacturing processes have developed custom or semi-custom handling components. Many of these OEMs have internal development capability for automated handling and many engineering companies also have automated handling development capability.

     The market for our reliability test equipment is also highly competitive and our competitors include QualiTau, Ltd., Chiron Technology Pte. Ltd., ESPEC Corp. and Reedholm Instruments Co. We compete for reliability test system sales on the basis of technology, price, delivery, system flexibility and overall system performance. We believe we compete favorably on all of these factors.

Manufacturing and Supplies

     We manufacture test handlers, reliability test equipment and our Automation Modules product line at our North St. Paul, Minnesota facility. We manufacture our turret based test handler products, some of our reliability test equipment and our 4800 Series at our Dallas, Texas facility. Our manufacturing operations consist of procurement and inspection of components and subassemblies, assembly and extensive testing of finished products.

     We emphasize quality and reliability in both the design and manufacture of our products. We or our suppliers inspect all components and subassemblies for mechanical and electrical compliance to our specifications. We test all finished products against our specifications, and

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customer specifications where applicable, and fully assembled test handler products are tested at all temperatures for which they are designed and with all the device packages to be accommodated.

     A significant portion of the components and subassemblies used in our products, including machined parts, PC boards, refrigeration systems, vacuum pumps and contactor elements, are manufactured by third parties on a subcontract basis. As a part of our total quality management program, we have an ongoing supplier quality program under which we select, monitor and rate our suppliers, and recognize suppliers for outstanding performance.

     Certain components used in our products, including certain contactor components, printed circuit boards and refrigeration systems, are currently available from only a limited number of sources. We do not maintain long-term supply agreements with most of our suppliers, and we purchase most of our components through individual purchase orders. We may not always be able to replace all of our suppliers within a time period consistent with our business requirements. We attempt to keep an adequate supply of critical components in our inventory to minimize any significant impact the loss of a supplier may cause.

Customers

     We rely on a limited number of customers for a substantial percentage of our net sales. In 2004, Maxim Integrated Products, Inc. and Samsung America, Inc. each accounted for more than 10% of net sales. Maxim Integrated Products, Inc. also accounted for more than 10% of net sales in 2003 and 2002, and MB Electronique S.A. also accounted for more than 10% of net sales in 2003. The loss of or a significant reduction in orders by these or other significant customers, including reductions due to market, economic or competitive conditions in the semiconductor industry, would likely have a negative impact on our financial condition and results of operations.

Sales and Marketing

     We market our products through a combination of direct salespeople, domestic independent sales representatives and international distributors. Our direct sales organization, comprised of seven salespeople, is responsible for most domestic sales, and coordinates the activities of our domestic independent sales representatives and international distributors and actively participates with them in selling efforts. This enables us to establish strong direct ties with our customers.

     We maintain sales and service locations in North St. Paul, Minnesota, Santa Clara, California, San Diego, California, Dallas, Texas, Boise, Idaho, and Saugus, Massachusetts. As of December 31, 2004, we had international distributors located in the United Kingdom, France, Germany, Italy, Korea, Japan, Taiwan, Hong Kong, China, Thailand, Malaysia, Singapore and the Philippines.

     Our marketing efforts include participation in industry trade shows and production of product literature and sales support tools. These efforts are designed to generate sales leads for our domestic independent sales representatives, international distributors and direct salespeople.

     International shipments accounted for 52%, 54% and 59% of our net sales in 2004, 2003 and 2002, respectively. In addition, it is not uncommon for U.S. customers to take delivery of products in the United States for subsequent shipment to international sites, particularly the Automation Modules product line that is sold on an OEM basis. Most of our international shipments are made to international sites of U.S. semiconductor manufacturers, although there is a growing foreign customer base included in our international sales.

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     We invoice all of our international sales in U.S. dollars and, accordingly, have not historically been subject to fluctuating currency exchange rates. We establish credit limits from time to time on our international distributors, who purchase products from us and resell to end-users. We also often require irrevocable letters of credit from our end-user international customers to minimize credit risk and to simplify the purchasing/payment cycle.

Research and Development

     We believe we must continue to enhance, broaden and modify our existing product lines to meet the constantly evolving needs of the semiconductor equipment market. To date, we have relied both on internal development and acquisitions of technology and product lines to extend our product lines, increase our customer base and avoid reliance on any single semiconductor equipment market segment. Our research and development is conducted at both our North St. Paul, Minnesota and Dallas, Texas facilities. We focus our new product development efforts on the most compelling requirements in the largest and fastest growing segments of the IC side of the semiconductor industry, with emphasis on near term revenue potential. In 2004, we concentrated our new product development efforts on:

	•	completing development of and beta testing the 55V8 Series quad test site gravity feed handlers;
	•	developing alternative applications for our high speed test site actuator for the 55V6 and 55V8 Series of test handlers;
	•	integrating laser mark capability on the Model 8832 test handler;
	•	developing and beta testing the sixteen-head model burn in board loader/unloader for the 4800 Series; and
	•	developing additional test capabilities for our 1164 Series of reliability test equipment for the latest generations of copper, gate oxide and transistor device technologies.

     Product development expenses are typically divided approximately 50% for new product development and 50% for continuation engineering. Our continuation engineering efforts include the development of additional change kits to meet the expanding families of IC and discrete electronic component package types, further advancement of contactor technologies, and the addition of features and performance options for existing equipment.

     We expense all research and development costs, including costs for software development, as incurred. In 2004, 2003 and 2002, our expenses relating to research and development were approximately $3.6 million, $2.6 million and $2.3 million, respectively. Over time, our objective is to invest approximately 12% to 15% of our net sales in research and development, and in 2004 our research and development expense totaled about 13% of our revenue. However, the percentage may be higher in periods of reduced sales, such as 2003 and 2002. We employed 27 engineering personnel as of December 31, 2004.

Intellectual Property

     We attempt to protect the proprietary aspects of our products with patents, copyrights, trade secret law and internal nondisclosure safeguards. We currently hold several U.S. patents covering certain features of our handling systems, reliability test systems and Automation Modules, the contactor elements incorporated in certain of our test handlers, and elements of our proprietary conductive thermal

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technology. The source code for the software contained in our products is considered proprietary and we typically do not furnish source code to our customers. We have also entered into confidentiality agreements with our employees. Despite these restrictions, it may be possible for competitors or users to copy aspects of our products or to obtain information that we regard as a trade secret.

     There is a rapid pace of technological change in the semiconductor industry, which in turn compels us to continually enhance and extend our product lines. We believe that patent, trade secret and copyright protection is less significant to our competitive position than factors such as the knowledge, ability and experience of our personnel, new product development, frequent product enhancements, name recognition and ongoing, reliable product maintenance and support.

Backlog

     Our backlog was $2.8 million at the end of 2004 and $6.4 million at the end of 2003. Because purchase orders are generally subject to cancellation or delay by customers with limited or no penalty, our backlog is not necessarily indicative of future revenue or earnings. We expect to ship in 2005 all of our backlog as of the end of 2004.

Employees

     As of December 31, 2004, we had 90 employees, consisting of 35 in manufacturing, 27 in engineering and product development, 17 in sales, marketing and customer service, and 11 in general administration and finance. None of our employees is represented by a labor union or is subject to any collective bargaining agreement. We have never experienced a work stoppage and we believe that our employee relations are satisfactory.

Financial Information About Geographic Areas

     See Note 16 to the Consolidated Financial Statements included in this Annual Report on Form 10-K for information about geographic areas.

Certain Important Factors

     In addition to the factors identified above, there are several important factors that could cause our actual results to differ materially from our results in the past and those we anticipate as reflected in any forward-looking statements. Please refer to the heading “Business Risks and Uncertainties” located in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” under Item 7 of this Annual Report on Form 10-K for a discussion of these factors and their potential impact on the success of our operations and our ability to achieve our goals.

ITEM 2. PROPERTIES.

     We conduct our corporate functions and manufacturing, product development, sales, marketing and field service activities in North St. Paul, Minnesota. We currently occupy approximately 45,000 square feet in North St. Paul under a lease that expires in February 2006. We have an option under the lease, exercisable at any time during the initial lease term, to require construction of approximately 45,000 additional square feet for lease at the same rental rate. We also conduct manufacturing, product development, sales, marketing and field service activities in approximately 28,000 square feet in Dallas, Texas, under a lease that expires in April 2006.

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     We also have the following continuing lease obligations:

	•	We vacated a 30,000 square foot facility that is adjacent to our North St. Paul facility in June 2001 when we consolidated our North St. Paul operations into a single building. This facility is under a lease that expires in February 2006. Approximately two-thirds of this space is currently subleased to third parties, and we are actively seeking to sublease the remainder. We remain liable under the lease, on a contingent basis, for the portion of this facility that is subleased.
	•	We vacated a 45,000 square foot facility in Poway, California in 2000. This lease expires in January 2010. This space is currently subleased to third parties. We remain liable for this facility under the lease, on a contingent basis.

ITEM 3. LEGAL PROCEEDINGS.

     We are not a party to, and none of our property is the subject of, any material pending legal, governmental, administrative or other proceedings.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

     We did not submit any matter to a vote of our security holders during the fourth quarter of fiscal year 2004.

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ITEM 4A. EXECUTIVE OFFICERS OF THE REGISTRANT.

     Our executive officers, their ages and the offices they held as of March 1, 2005 are as follows:

     Mr. Levesque has served as our President, Chief Executive Officer and Chairman of our board since 1986. From 1973 to 1986, Mr. Levesque served in various capacities and most recently as Executive Vice President of Micro Component Technology, Inc., a manufacturer of IC testers and test handlers.

     Mr. Hemer has served as one of our directors since 1986, and has served as our Secretary since May 2000 and as our Chief Administrative Officer since March 2001. He served as our Group Vice President from August 1998 to March 2001, as the President of our Poway, California operations from February 1997 to August 1998 and as our Chief Administrative Officer from May 1996 until February 1997. Mr. Hemer was a partner in the law firm of Oppenheimer Wolff & Donnelly LLP for more than 15 years before joining Aetrium. Mr. Hemer is also a director of Versa Companies, a privately held company.

     Mr. Koch has served as our Vice President - Worldwide Sales since March 1991. From March 1990 to March 1991, Mr. Koch served as the Vice President of Sales of Summation, Inc., a company involved with the testing of IC boards. From December 1973 to March 1990, Mr. Koch served in various sales positions and most recently as Vice President of Sales of Micro Component Technology, Inc.

     Mr. Pollock has served as the Vice President and General Manager of our North St. Paul operations since December 2001. From August 1998 to December 2001, Mr. Pollock served as our Vice President of Product Development and Marketing. From April 1998 to August 1998, Mr. Pollock served as interim general manager of our North St. Paul operations. From November 1997 to May 1998, Mr. Pollock served as interim general manager of the handler group we acquired from Advantek Inc. From September 1996 to August 1997, Mr. Pollock served as Business Unit Manager of our Automation Modules product group.

     Mr. Williams has served as the President of our Dallas operations since April 1998, when we acquired the handler equipment business of WEB Technology, Inc. Mr. Williams co-founded WEB in 1982, and served as its President and CEO from its inception until we acquired it.

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     Mr. Askegaard has served as our Treasurer since February 1992. From October 1986 to February 1992, Mr. Askegaard served as our Corporate Controller.

     Mr. Foley has served as the Vice President – Manufacturing of our North St. Paul operations since December 2001. Prior to that, he served at our North St. Paul Operations as Vice President – Operations from August 1998 to December 2001, Vice President – Manufacturing from October 1996 to August 1998, and in various other positions since joining us in 1988.

     Mr. Hedstrom has served as the Vice President – Engineering of our North St. Paul operations since September 2004. From 1993 to 1998 Mr. Hedstrom was a co-founder, director, and later President of CariTech, Inc., a manufacturer of carrier tape materials for the IC industry. Following the acquisition of CariTech by Illinois Tool Works in August 1998, he served as Engineering Manager – World Wide Operations for Illinois Tool Works until May 2001. Prior to founding CariTech and subsequent to his retirement from Illinois Tool Works, Mr. Hedstrom served as President and a Principal of Hedstrom Engineering Co., a consulting firm specializing in industrial automation and controls.

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PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS.

Market Information

     Our common stock is quoted on The Nasdaq National Market under the symbol “ATRM.” The following table summarizes the high and low closing sale prices per share of our common stock for the periods indicated, as reported on The Nasdaq National Market. These prices do not include adjustments for retail mark-ups, markdowns or commissions.

Holders

     As of March 16, 2005, there were approximately 169 shareholders of record. We estimate that an additional 4,200 shareholders own stock held for their accounts at brokerage firms and financial institutions.

Dividends

     We have never paid cash dividends on our common stock. We currently intend to retain any earnings for use in our operations and do not anticipate paying cash dividends in the foreseeable future.

Securities Authorized for Issuance Under Equity Compensation Plans

     The information required to be disclosed by Item 201(d) of Regulation S-K, “Securities Authorized for Issuance Under Equity Compensation Plans,” is included under Item 12 of Part III of this Annual Report on Form 10-K.

Recent Sale of Unregistered Securities

     We did not have any unregistered sales of equity securities during fiscal year 2004.

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     ITEM 6. SELECTED FINANCIAL DATA.

     You should read the Selected Financial Data presented below in conjunction with the Consolidated Financial Statements and notes thereto included elsewhere in this Annual Report on Form 10-K, and in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included elsewhere in this Annual Report on Form 10-K.

Five Year Summary
(in thousands, except per share data)

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Quarterly Financial Data (Unaudited)
(in thousands, except per share data)

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

Overview:

     Aetrium designs, manufactures and markets a variety of electromechanical equipment used by the semiconductor industry to handle and test semiconductor and passive electronic devices, such as integrated circuits, or ICs, and discrete electronic components. Our primary emphasis is on the IC segment of semiconductor manufacturing.

     The semiconductor equipment industry is often described as a cyclical growth industry characterized by a long-term growth trend occasionally interrupted by periods of contraction and significant declines in revenue. General industry conditions and the demand for Aetrium’s products can fluctuate significantly from period to period as a result of numerous factors, including but not limited to changes in U.S. and worldwide economic conditions, supply and demand for ICs and discrete electronic components, changes in semiconductor manufacturing capacity, advancements in industry technologies and competitive factors. For these and other reasons, our operating results for 2002, 2003 and 2004 may not be indicative of future operating results.

     Following a very strong year in calendar 2000, the semiconductor equipment industry experienced a deep and prolonged business downturn during the three-year period ended December 31, 2003. During most of this period, U.S. and global economic conditions were generally weak and many semiconductor manufacturers experienced significantly reduced demand for their products, resulting in elevated inventory levels and significant excess production capacity. These factors led to a dramatic cutback in capital spending, resulting in the most severe downturn in the history of the semiconductor equipment industry.

     In 2001, semiconductor manufacturers experienced a significant decrease in demand for their products, which led to sharply reduced capital spending and rescheduling or cancellation of many existing equipment orders. These generally weak industry conditions continued into early 2002, but began to improve somewhat by mid-year as many semiconductor manufacturers began to experience stronger demand for ICs and improvements in capacity utilization. However, the anticipated industry recovery stalled in the second half of the year amid weakening economic conditions, concerns about war and lower consumer demand for products containing ICs and discrete electronic components. As a result, 2002 revenues for the test, assembly and packaging, or TAP, segment of the semiconductor equipment industry dropped approximately 70% compared with 2000 levels, according to Semiconductor Equipment and Materials International, reporting on North American semiconductor equipment companies. Our 2002 revenues of $12.7 million were down 37% compared with 2001 and down 72% compared with 2000.

     In 2003, semiconductor industry business conditions remained very weak although there were signs of improvement as the year progressed, including increasing shipments of semiconductors, decreasing inventory levels, improving capacity utilization rates and an improving economic climate. As the end of the year approached, these factors led to increased capital spending at levels that suggested the beginning of an industry recovery. Aetrium’s revenues remained relatively flat through the first three quarters of 2003 and increased in the fourth quarter as equipment orders increased significantly. As a result of the stronger fourth quarter, our 2003 revenues of $14.1 million were up 11% compared with 2002, which was comparable to the percentage increase in capital spending by the worldwide semiconductor industry as a whole in 2003.

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     In the first half of 2004, business conditions improved significantly as many semiconductor manufacturers increased capital spending in response to increased demand for their products. Aetrium’s revenues increased dramatically in this period and were more than double the revenues for the first half of 2003. However, industry conditions weakened again in the second half of 2004 as semiconductor manufacturers addressed rising inventory levels. As a result, semiconductor manufacturers decreased capital spending, particularly in the TAP segment of the semiconductor equipment industry. Aetrium’s orders and revenues decreased sequentially in the third and fourth quarters, and second half revenues were approximately 18% lower than the first half of the year. Revenues for the year totaled $27.8 million compared with $14.1 million in 2003, an increase of 97%. Although the duration and severity of the current industry slowdown is unknown, we expect industry conditions to remain weak through at least the first quarter of 2005.

Critical Accounting Policies and Estimates:

     Management’s discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. We base our estimates on historical experience and on various other assumptions that we believe are reasonable under the circumstances, the results of which form t