UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

Commission file number 0-13198

Morton Industrial Group, Inc.

www.mortongroup.com

(Exact name of registrant as specified in its charter)

Securities registered pursuant to Section 12(b) of the Act:

None

Securities registered pursuant to section 12(g) of the Act:

Class A Common Stock, par value $.01 per share

(Title of class)

     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.     þ

      Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) 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.     þ

      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 common stock held by non-affiliates of the registrant (based upon the last reported sale price on the Nasdaq Small Cap Market) on the last day business day of the registrant’s most recently completed second fiscal quarter was approximately $6,700,000.

      As of March 4, 2005, the aggregate market value of the Class A Common Stock held by non-affiliates was approximately $12,000,000 and there were 4,842,211 shares of Class A Common Stock and 100,000 shares of Class B Common Stock issued and outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

      Portions of the definitive Proxy Statement of the Registrant for the Annual Meeting of Shareholders to be held in June 2005 are incorporated by reference into Part III hereof.

      “Safe Harbor” Statement Under The Private Securities Litigation Reform Act Of 1995: This annual report contains “forward looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, including statements containing the words “anticipates,” “believes,” “intends,” “estimates,” “expects,” “projects” and similar words. The forward looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results to be materially different from any future results expressed or implied by such forward looking statements. Such factors include, among others, the following: the loss of certain significant customers; the cyclicality of our construction and agricultural sales; the availability of working capital; general economic and business conditions, both nationally and in the markets in which we operate or will operate; competition; and other factors referenced in the Company’s reports and registration statements filed with the Securities and Exchange Commission. Given these uncertainties, prospective investors are cautioned not to place undue reliance on such forward-looking statements. The forward-looking statements contained herein speak only of the Company’s expectation as of the date of this annual report. We disclaim any obligations to update any such factors or publicly announce the result of any revisions to any of the forward looking statements contained herein to reflect future events or developments.

PART I

Narrative Description of Business

      We are a contract manufacturer of highly engineered metal components and subassemblies for construction, industrial, and agricultural original equipment manufacturers (“OEM’s”). Our products include engine enclosures, panels, platforms, frames, tanks and other components used in backhoes, excavators, tractors, wheel loaders, power generators, turf care equipment and similar industrial equipment. Our products are typically highly engineered, cosmetically sensitive, require structural strength and contain complex weldments.

      Our largest customers include Deere & Co. (“Deere”) and Caterpillar Inc. (“Caterpillar”) who together generated 87% of our 2004 net sales. Our five manufacturing facilities are located in the Midwestern and Southeastern United States in close proximity to our customers. We have no foreign operations.

      Customers use our products in construction, industrial, and agricultural equipment. As OEM’s in these industries have intensified their focus on core competencies, they have increasingly outsourced more of their production parts to reduce costs. To effectively manufacture products for OEMs, suppliers must invest in technologically advanced equipment, develop in-house design capabilities, and coordinate manufacturing and product delivery with their customers.

      Historically, our largest customers, Deere and Caterpillar, have been supplied by a large number of local suppliers that would each produce a small number of products. As these OEMs have increased the complexity of their equipment and become more dependent on component and subassembly suppliers, they have reduced the size of their supplier base and have established close relationships with a smaller number of sophisticated suppliers who can provide a range of services, including design engineering, prototyping, sophisticated quality systems, and just-in-time delivery. The high levels of service necessary to serve these customers, coupled with significant tooling investments, have resulted in the sole-sourcing of many products rather than dual or multi-sourcing. Currently, we are the sole-source provider of over 90% of the products that we supply to our customers. As these customers continue to reduce the size of their supplier base and outsource a growing percentage of their product needs, we expect to become the sole-source provider on an increasing number of products.

      Virtually all of our customers are located in the United States, and we do not have material sales to foreign customers. Considering our relatively low volume of parts manufactured, the cosmetic sensitivity of those parts, and the bulk involved in shipping those parts, we believe that our customers prefer to source those parts domestically.

      The $18 billion U.S. construction equipment industry includes construction, earth moving and forestry equipment, as well as some material handling equipment, lifts, off-highway trucks and a variety of machines for specialized industrial applications. Caterpillar and Deere dominate the U.S. construction equipment industry, and together accounted for an estimated 50% of total U.S. unit sales in 2004. We supply metal components and subassemblies, such as engine enclosures, platforms, frames and complex weldments. Our customers use these products in backhoes, excavators, wheel loaders, skid-steer loaders, lifts and similar construction equipment. Our sales per construction equipment vehicle range up to $2,500. Construction equipment products account for approximately 65% of our 2004 net sales.

      We produce a range of components and subassemblies for equipment used in a variety of industrial applications, including store fixtures, motor homes, turf care equipment and power generators. Customers in the industrial equipment area generally serve stable or growth markets, and these customers include Caterpillar, Deere, Kubota, Hallmark and Winnebago. Industrial equipment products account for approximately 22% of our 2004 net sales.

      The $15 billion U.S. agricultural equipment industry includes large, relatively expensive products such as tractors, combines and other farming equipment. Deere and Caterpillar accounted for an estimated 35% of total U.S. agricultural equipment unit sales in 2004. We supply metal components and subassemblies such as steps, grills, and landing decks. Our sales per agricultural equipment vehicle range from $200 to $3,000. Agricultural equipment products account for approximately 13% of our 2004 net sales.

      Our investments in modern equipment and systems have allowed us to produce a broad line of highly engineered components and subassemblies. We strive to meet customers’ needs for design engineering, prototyping, product fabrication and just-in-time delivery.

      Our sheet metal fabrication capabilities include laser and plasma cutting, forming, punching, welding, painting and assembly processes. Our sheet metal fabrication processes operate on information created by CAD/ CAM software, utilize optic laser cutting machines to cut parts at high speeds and use robotic welders to complement manual welding operations. Our painting operations are capable of producing the wide variety of paint finishes required by customers.

      Fabricated Sheet Metal Products Include:

      We offer our customers a number of services described below:

      This service category includes design, development, analysis and costing for our products. We prefer to and often work with customers in the early stages of designing their products.

      This service category includes prototyping, tooling and pre-production steps in the manufacturing process. Our dedicated prototype and tooling departments work with customers throughout development efforts, allowing for a smooth introduction of new products.

      This service category includes a number of decorating operations such as liquid and powder coat painting and decal application.

      This service category includes providing customers the ability to order products in low lot sizes with minimal lead time enabling them to reduce their overall order cycle time. We also provide deliveries that are specially sequenced to customers’ manufacturing schedules.

      Engineering capabilities have become increasingly emphasized as suppliers provide design services for new projects. Computer aided design capabilities include Pro/ ENGINEER, Anvil 1000/5000, Apollo, Merry Mechanization and CADKEY. We have focused our computer aided design investment on the Pro/ ENGINEER system during the last several years because Pro/ ENGINEER is the preferred system of the majority of our customers. Computer aided design allows us to download completed and approved designs directly to production equipment in most plants. The resulting direct interaction between customers’ designers and our engineers facilitates joint development of new components and redesigns of old parts.

      Consistent with our emphasis on technology, computer systems and controls are an integral part of our operating strategy. We have invested heavily in management information systems and computer aided design capabilities and control functions, particularly during the last several years. We also use computer systems to provide timely performance measurements of shop floor quality and activity, daily actual cost information for each factory, electronic data interchange with major customers, real-time dispatching of work orders, integration of purchasing information with production scheduling, capacity management and inventory information.

Sales and Marketing

      To better serve our customers, we have combined our sales and engineering organizations. The sales and engineering group has primary responsibility for managing relationships with customers and working with

them to design new products. Our customers are serviced by account teams led by an account manager and include representatives from our primary functional areas. These areas include engineering and customer service. Account teams work with the customer to design products and produce prototypes, schedule production and monitor quality and customer satisfaction. Our account managers also lead the new business development process, working with customers to obtain details of new outsourcing programs, new products currently being designed and existing products which will be redesigned. We believe that the structure of our sales and marketing organization helps to ensure cooperation in product design and helps us to gain repeat and new business from our customers.

Manufacturing/ Production

      We use a range of manufacturing processes to serve the needs of our customers. Using these processes, we can manufacture products ranging from simple metal parts to more complex metal subassemblies. Our design and engineering capabilities provide us with a competitive edge in obtaining and maintaining preferred supplier status with our customers.

      Sheet Metal Fabrication. Our sheet metal fabrication capabilities include laser cutting, punching, forming, folding, welding, painting and assembly processes. Our sheet metal fabrication processes, operating on information created by Pro/ ENGINEERING software, use optic laser cutting machines to cut parts at high speeds. We use robotic welders to complement our manual welding operations. Our painting operations are capable of producing the wide variety of paint finishes required by our customers.

Raw Materials

      The primary raw materials that we use are sheet steel, assembly parts and paint. Prices of these raw materials fluctuate, although the price of our most significant raw material, steel, increased dramatically during 2004. The steel supply tightened, due in part to the national economic recovery, China’s growing steel consumption, and reduced domestic steel production capacity. We expect pricing to stabilize during 2005 at relatively high levels. We have been able to negotiate with our customers to have them absorb substantial amounts of the increases in our raw material costs. We also participate in the steel purchase programs of certain major customers which lowers our cost for steel. Generally, we purchase our raw materials from multiple suppliers, and we believe that the prices we obtain are competitive.

Competition

      The manufacturing and supplying of highly engineered metal products to original equipment manufacturers is a fragmented and highly competitive business, with no single supplier having significant market share. We believe suppliers with a strong management team, a range of capabilities, modernized facilities and technologically sophisticated equipment like us are more likely to benefit from original equipment manufacturers’ increased outsourcing of production than other participants in the industry lacking such assets. However, competitive pressures or other factors could cause us to lose market share or could result in significant price erosion with respect to our products.

Regulatory/ Environmental Matters

      Our operations are subject to numerous federal, state and local environmental and worker health and safety laws and regulations. We believe that we are in substantial compliance with such laws and regulations and have not budgeted any material capital expenditures for environmental control facilities.

Financial Information about Industry Segments

      We have one reportable segment — contract metal fabrication. The contract metal fabrication segment provides full-service fabrication of parts and sub-assemblies for the construction, agricultural and industrial equipment industries.

Backlog

      Our backlog of orders was approximately $120.0 million at December 31, 2004, and $99.0 million at December 31, 2003. We anticipate that we will substantially fill all of the December 31, 2004, backlog orders during the current year.

Patents, Trademarks, Licenses, Franchises, and Concessions; Research and Development

      We hold no material patents, trademarks, franchises, or concessions. We are the licensee under a number of software licenses that we use in our design, production, and other business operations. All of these licenses have customary terms and conditions. Our research and development expenditures are not material.

Working Capital Items

      Our working capital requirements reflect several business factors. Our working capital requirements are typically greater during the second half of the calendar year because both Deere and Caterpillar suspend operations for two weeks of vacation time during July and/or August. Production operations of both of these customers also slow down during the last two weeks of December. During these periods, we must rely more heavily on our credit facilities for liquidity. Additional discussion regarding working capital can be found in Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Employees

      As of February 26, 2005, we employed 1,330 employees, of whom 1,112 were hourly and 218 were salaried. None of these employees was subject to a collective bargaining agreement. We believe our relationship with our employees is good.

Internet

      You can find our web site at www.mortongroup.com. At this website, click on the “Annual Report” link; you can choose to view the latest Annual Report on file, or you can click “SEC Offsite Filings” to link to the SEC website that provides all of the Company’s SEC filings since 1997.

Significant Past Events of the Business

      On January 20, 1998, Morton Metalcraft Holding Co. and its subsidiaries (“Morton”) merged (the “Merger”) with MLX Corp. (“MLX”), with MLX being the surviving corporation. As a result of the Merger, Morton ceased to exist as a separate corporate entity and MLX amended its Articles of Incorporation to change the corporate name of MLX to Morton Industrial Group, Inc. (the Company). Morton was engaged in the business of manufacturing fabricated metal components for construction and agricultural original equipment manufacturers and other industrial customers.

      On April 15, 1999, we acquired from Worthington Custom Plastics three manufacturing facilities that produced plastic components for industrial original equipment manufacturers. The Worthington acquisition expanded our plastic product offerings to include appliance parts, electronics housings and other injection molded and thermoformed plastic products. These plastics facilities operated as Morton Custom Plastics, LLC (MCP, LLC). On November 1, 2002, MCP, LLC, filed for protection as debtor-in-possession under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the District of Delaware. Before filing, MCP, LLC had negotiated the terms of an agreement for sale of substantially all of its assets to Wilbert, Inc., pursuant to an Asset Purchase Agreement. Under the agreement, Wilbert, Inc. was also to assume the liabilities of MCP, LLC under certain of their contracts and leases. This sales transaction closed on December 24, 2002, with the cash consideration applied to the reduction of MCP, LLC’s senior secured debt. The Company also operated an injection molding business in Iowa until that operation was sold in June 2003. These sales allowed the Company to focus on its core competency, manufacturing fabricated sheet metal.

      The following table presents summary information regarding our facilities. The properties are owned except where indicated by the word “leased”. Lease terms for these facilities expire between 2006 and 2008. Our facilities are generally located in close proximity to our customers.

      In addition to manufacturing operations, our 1021 W. Birchwood Street complex in Morton, Illinois houses the senior management of the Company.

      While we own much of the equipment used in our operations, we also use customer-owned tooling and equipment as well as equipment under operating leases. We believe our facilities are adequate to satisfy current and reasonably anticipated future production requirements.

Worthington

      On May 1, 2000, Worthington Industries, Inc. (“Worthington”) filed suit (in the United States District Court for the Southern District of Ohio, Eastern Division (“the Court”)) against us and Morton Custom Plastics, LLC (“MCP, LLC”) related to MCP, LLC’s 1999 acquisition of the non-automotive plastics business from Worthington. Worthington claimed that it was owed additional amounts under the sale agreement and a related service agreement, and that it was owed dividends on shares of our preferred stock that it received. We believed that certain warranties and representations made by Worthington at the time of acquisition were breached and that amounts claimed by Worthington were not due. We had filed a counterclaim against Worthington related to these matters.

      In connection with a preferred stock redemption agreement dated December 23, 2003, the parties settled all litigation between the Company and Worthington. The Court entered an order of dismissal of the Worthington lawsuit on January 20, 2004.

      The preferred stock redemption agreement dated December 23, 2003 provides for 30 monthly redemption payments of $50,000 each (totaling $1.5 million) over a three year period (10 payments each year in 2004, 2005 and 2006) to fully redeem the $10.0 million face value of the redeemable preferred stock. Each $50,000 payment and redemption of 333 (or 334) shares reduces the fully accreted $10.0 million face value of the redeemable preferred stock by $333,000 (or $334,000). As of February 28, 2005, the Company has paid timely 12 of the 30 scheduled redemption payments. The redemption payments in 2004 resulted in a gain on

redemption of preferred shares of $2,833,000 which is reflected in the accompanying Consolidated Statements of Operations.

      The Company is also involved in routine litigation. Management does not believe any legal proceedings would have a material adverse effect on the Company’s financial condition, results of operations or cash flows.

      Not applicable

PART II

Item 5.                      Market for Registrant’s Common Equity and Related Stockholder Matters.

      The trading of the Company’s Class A common stock is on the OTC Bulletin Board. The Company’s ticker symbol is MGRP.OB.

      The following table sets forth for 2004 and for the fourth quarter of 2003 the quarterly high and low closing bids. OTC closing bids reflect interdealer prices, without retail mark-up, mark-down, or commission, and may not necessarily represent actual transactions.

      The following table sets forth for the first three quarters of 2003 the quarterly high and low closing prices. OTC closing prices reflect interdealer prices, without retail mark-up, mark-down, or commission, and may not necessarily represent actual transactions.

      We obtained the foregoing information from research services made available by Pink Sheets.

      As of March 9, 2005 there were 3,258 holders of record and 1,609 beneficial holders of our Class A Common Stock.

      We did not declare or pay any common stock dividends in our fiscal years ended December 31, 2004 and 2003. Our credit agreements preclude the payment of dividends.

      During the year ended December 31, 2004, we did not issue any shares of capital stock that were unregistered under the Securities Act of 1933.

      On September 20, 2000, the Company issued warrants to purchase 238,548 shares of its Class A common stock to its bank lenders. The warrants, as amended, were exercisable at any time through December 31, 2006 at an exercise price of $.01 per share. On March 26, 2004, in connection with a refinancing described in Item 7, the holders surrendered these warrants.

      On March 26, 2004, in connection with the refinancing described in Item 7, we issued to our lenders 545,467 warrants (which expire March 26, 2014) to purchase Class A shares of common stock at an exercise price of $0.02 per share. The number of warrants may decline over the first five years of the related refinancing agreements based on the Company achieving specified EBITDA (earnings before interest, taxes, depreciation and amortization) levels, or achieving certain stated levels of net equity. The Company achieved the specified EBITDA level for 2004, and, accordingly, the maximum number of warrants that can be exercised is 479,859. None of these warrants have been exercised as of March 4, 2005.

      As of December 31, 2004, under our 1997 Stock Option Plan (which was approved by our shareholders), issued and outstanding stock options are as follows:

      In addition to these options, we have reserved for future grants an additional 327,561 shares.

Selected Historical Financial Data

      Set forth below are certain selected historical financial data. This information should be read in conjunction with our financial statements and the related notes thereto and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included herein. The financial data is derived from our audited financial statements.

MANAGEMENT’S DISCUSSION AND ANALYSIS OF

FINANCIAL CONDITION AND RESULTS OF OPERATIONS

      The following discussion should be read in conjunction with our consolidated financial statements and the notes thereto included elsewhere in this annual report.

General

      We are a contract manufacturer of highly engineered metal components and subassemblies for construction, industrial and agricultural original equipment manufacturers. Our largest customers, Caterpillar and Deere, accounted for approximately 87% and 88% of our net sales in 2004 and 2003, respectively.

      Historically, the Company has been a fabricator of sheet metal products. Subsequent to a merger in January, 1998, when the Company became a publicly-traded entity, the Company acquired six facilities that fabricated either injection molded or thermoformed plastic components. Two of the plastics fabrication facilities were acquired separately in 1998, and four were acquired together in 1999. One of the plastics fabrication facilities acquired in 1998 was sold at the end of 1999. The four plastics fabrication facilities acquired together in 1999 were sold in December, 2002. These four facilities, operating as Morton Custom Plastics, LLC, were incurring significant losses and, in 2002, filed for protection as debtor-in-possession under Chapter 11 of the United States Bankruptcy Code. At the time of the sale of Morton Custom Plastics, LLC, the Company determined that is was appropriate to focus solely on its core competency, sheet metal fabrication, and offered for sale its remaining plastics fabrication facility, which was sold in June, 2003. In the Company’s accompanying financial statements, all of the plastics fabrication results are reported as discontinued operations.

      As a part of the 1999 plastics facilities acquisition, the Company issued $10.0 million of redeemable preferred stock with a maturity date of April 2004. The Company negotiated a settlement in December 2003 with the holder of the preferred stock, and began making redemption payments in January, 2004. If the redemption payments are paid according to the terms of the settlement agreement, the payments will aggregate $1.5 million over a three-year period ending in 2006. Through February 28, 2005, all scheduled payments have been made timely; twelve of the thirty scheduled redemption payments have been made.

      Since June 2003, the Company has focused solely on its core business, sheet metal fabrication (the Company’s continuing operations). The Company recognized earnings from its continuing operations in 2003 and 2004, but had incurred losses from its continuing operations in 2001 and 2002 when demand by the Company’s customers was depressed.

      To take advantage of the potential for growth in 2004 and beyond, and to be able to effectively serve our customers, we needed to be able to ensure an adequate flow of raw materials into our production processes, hire and train additional employees, fund our need for new manufacturing equipment and meet our other working capital needs. Accordingly, the Company entered into a new credit facility in March 2004 that is described below. The new credit facility provided additional availability at the closing of approximately $5.0 million. Management believes that the new credit facility has permitted to date, and will continue to permit, the Company to meet its liquidity requirements which are driven by raw material, manpower and capital expenditure requirements, through the term of the facility, which matures in March 2008.

      As noted above, two customers account for a significant portion of our net sales. Caterpillar and Deere continue to forecast greater orders for fabricated parts supplied by Morton Metalcraft Co. We believe that this demand is being fueled by the improved economic conditions in the United States. The Company has responded by hiring additional manpower, adding capital equipment as necessary and increasing the flow of purchased raw materials in a difficult steel market. The U.S. steel industry has restructured, consolidated and is challenged to meet growing domestic and international demand. The steel industry has been impacted by China’s growing consumption of scrap steel and coke, a raw material used in processing steel. Cosmetically

sensitive sheet steel, our core commodity, has seen significant price increases; most steel price increases have been passed through to our customers.

      In pricing our products, we consider the volume of the product to be manufactured, required engineering resources and the complexity of the product. Our customers typically expect us to offset any manufacturing cost increases with improvements in production flow, efficiency, productivity or engineering redesigns. As a part of their supplier development programs, our primary customers initiate cost improvement efforts on a regular basis. At the conclusion of any such effort, when savings can be documented, we share the savings with our customer.

Results of Operations

      The following table presents certain historical financial information expressed as a percentage of our net sales.