Exhibit 99.1

GLATFELTER REPORTS FIRST QUARTER 2021 RESULTS

CHARLOTTE, North Carolina – May 4, 2021: Glatfelter Corporation (NYSE: GLT), a leading global supplier of engineered materials, today reported net income for the first three months of 2021 of $8.4 million, or $0.19 per diluted share, compared with $7.4 million, or $0.17 per diluted share, in the same period a year ago. Adjusted earnings from continuing operations for the three months ended March 31, 2021 and 2020, were $8.5 million, or $0.19 per share, compared with $10.8 million, or $0.24 per share, respectively. Adjusted earnings is a non-GAAP financial measure for which a reconciliation to the nearest GAAP-based measure is provided within this release. Consolidated net sales for the three months ended March 31, 2021 totaled $225.7 million, compared with $231.6 million for the same period in 2020. On a constant currency basis, Composite Fibers’ and Airlaid Materials’ net sales decreased by 1.4% and 18.8%, respectively.

“Glatfelter continued to deliver strong earnings in the first quarter of 2021 by effectively managing costs and driving operating efficiencies, despite a challenging market,” said Dante C. Parrini, Chairman and Chief Executive Officer. “Composite Fibers performed better than expected as volume growth in food and beverage and favorable wallcover demand improved overall product mix and asset utilization, thereby helping to drive a 6% increase in year-over-year operating profit. In Airlaid Materials, volumes were under pressure, especially in the tabletop category that was down 55% compared to last year due to the pandemic as restaurant dining remains slow to recover. We also experienced lower than anticipated demand in wipes, homecare and feminine hygiene products as customers recalibrated order levels to account for COVID-driven year-end inventory reserves. Despite the overall market volatility, both segments achieved healthy EBITDA margins in the mid-teens.”

Mr. Parrini added, “Our recently announced price increases in the Composite Fibers segment are contributing to offset the steep raw material, energy and logistics cost inflation we are experiencing. While we continue to navigate the dynamic demand conditions resulting from the pandemic, we remain very optimistic about the long-term growth prospects that our essential consumer staples portfolio has to offer as we focus on strong commercial execution to optimize performance in the near term.”

“As recently announced, the regulatory review process has concluded for our pending acquisition of Georgia-Pacific's U.S. nonwovens business. We expect this transaction will close by mid-May, building on our growth strategy and advancing our plans to expand our U.S. footprint. We are excited to begin the integration process that we expect will enable capacity optimization, improve operational enhancements and accelerate innovation efforts to better service our customers' growing needs, especially in the wipes category. Glatfelter is well-positioned to capture and service the growing demand in the broader health and hygiene categories as we continue to make meaningful and accretive investments to add further scale to our platforms,” concluded Mr. Parrini.

First Quarter Results

The following table sets forth a reconciliation of results on a GAAP basis to an adjusted earnings basis, a non-GAAP measure:

A description of each of the adjustments presented above is included later in this release.

Composite Fibers

Composite Fibers’ net sales increased $8.5 million or 6.4% in the first quarter of 2021, compared to the year-ago quarter, mainly driven by favorable currency translation of $10.3 million. Overall shipments, excluding metallized, which was restructured in the second quarter of 2020, were in-line with the first quarter of 2020.

Composite Fibers’ operating income of $16.1 million was $1.0 million higher, or approximately 6% favorable, compared to the first quarter of 2020 as a result of improved sales mix, which favorably impacted results by $1.1 million. Raw material and energy prices were $1.3 million higher than the same period last year, but mostly mitigated by improved operations of $1.2 million.

Airlaid Materials

Airlaid Materials’ net sales decreased $14.4 million in the year-over-year comparison. Shipments were 18% lower driven by continued softness in tabletop demand from delays in restaurants reopening, as well as lower shipments in the hygiene and wipes categories as customers adjusted their buying patterns following elevated year-end inventory levels maintained due to the pandemic. Currency translation was $4.2 million favorable.

Airlaid Materials’ first quarter 2021 operating income of $7.2 million was $4.8 million lower when compared to the first quarter of 2020. Lower shipping volumes unfavorably impacted earnings by $3.2 million and operations were $1.3 million unfavorable driven by lower production to manage customer demand and inventory levels. Selling price increases due to raw material pass-through provisions were more than offset by higher raw material and energy prices, reducing earnings by net $0.3 million.

Other Financial Information

The amount of “Other and Unallocated” operating expense in the table of Segment Financial Information totaled $5.9 million in the first quarter of 2021 compared with $14.8 million in the same period a year ago. Excluding the items identified to present “adjusted earnings,” unallocated expenses for the first quarter of 2021 decreased $1.0 million compared to the first quarter of 2020.

In the first quarter of 2021, income from continuing operations totaled $15.6 million and income tax expense totaled $7.2 million. On adjusted pre-tax income of $15.5 million, income tax expense was $7.0 million in the first quarter of 2021. The comparable amounts in the same quarter of 2020 were $17.8 million and $7.0 million, respectively. The effective tax rate on adjusted earnings was 45% in the first quarter of 2021.

Balance Sheet and Other Information

Cash and cash equivalents totaled $87.4 million as of March 31, 2021, and net debt was $219.4 million compared with $213.9 million at the end of 2020. Net leverage increased nominally to 1.9 times on March 31, 2021 versus 1.8 times at December 31, 2020. (Refer to the calculation of this measure provided in the tables at the end of this release.)  

Capital expenditures during the first quarter of 2021 and 2020 totaled $5.4 million and $7.0 million, respectively. Adjusted free cash flow for the first three months of 2021 was a use of $8.9 million compared with a use of $10.6 million in the same period of 2020. (Refer to the calculation of measure provided in the tables at the end of this release.)

Conference Call

As previously announced, the Company will hold a conference call today at 11:00 a.m. (Eastern) to discuss its first quarter results. The Company will make available on its Investor Relations website this quarter’s earnings release and an accompanying financial presentation that includes significant financial information to be discussed on the conference call including the Company’s outlook pertaining to financial performance. Information related to the conference call is as follows:

Interested persons who wish to hear the live webcast should go to the website prior to the starting time to register and ensure any necessary audio software is installed.

Glatfelter Corporation and subsidiaries

Consolidated Statements of Income

(unaudited)

Segment Financial Information

(unaudited)

Selected Financial Information

(unaudited)

Reconciliation of GAAP Financial Information to Non-GAAP Financial Information

This press release includes a measure of earnings before the effects of certain specifically identified items, which is referred to as adjusted earnings, a non-GAAP measure. The Company uses non-GAAP adjusted earnings to supplement the understanding of its consolidated financial statements presented in accordance with GAAP. Non-GAAP adjusted earnings is meant to present the financial performance of the Company’s core operations, which consist of the production and sale of composite fibers and airlaid materials. Management and the Company’s Board of Directors use non-GAAP adjusted earnings to evaluate the performance of the Company’s fundamental business in relation to prior periods and established business plans. For purposes of determining adjusted earnings, the following items are excluded:

Unlike net income determined in accordance with GAAP, non-GAAP adjusted earnings does not reflect all charges and gains recorded by the Company for the applicable period and, therefore, does not present a complete picture of the Company’s results of operations for the respective period. However, non-GAAP adjusted earnings provide a measure of how the Company’s core operations are performing, which management believes is useful to investors because it allows comparison of such operations from period to period. Non-GAAP adjusted earnings should not be considered in isolation from, or as a substitute for, measures of financial performance prepared in accordance with GAAP.

Caution Concerning Forward-Looking Statements  

Any statements included in this press release which pertain to future financial and business matters are “forward-looking statements” within the meaning of the safe harbor provisions of the United States Private Securities Litigation Reform Act of 1995. The Company uses words such as “anticipates”, “believes”, “expects”, “future”, “intends”, “plans”, “targets”, and similar expressions to identify forward-looking statements. Any such statements are based on the Company’s current expectations and are subject to numerous risks, uncertainties and other unpredictable or uncontrollable factors that could cause future results to differ materially from those expressed in the forward-looking statements including, but not limited to, the impacts of the COVID-19 pandemic, changes in industry, business, market, and economic conditions, demand for or pricing of its products, market growth rates and currency exchange rates. In light of these risks, uncertainties and other factors, the forward-looking matters discussed in this press release may not occur and readers are cautioned not to place undue reliance on these forward-looking statements. The forward-looking statements speak only as of the date of this press release and Glatfelter undertakes no obligation, and does not intend, to update these forward-looking statements to reflect events or circumstances occurring after the date of this press release. More information about these factors is contained in Glatfelter’s filings with the U.S. Securities and Exchange Commission, which are available at www.glatfelter.com.

About Glatfelter

Glatfelter is a leading global supplier of engineered materials. The Company’s high-quality, innovative and customizable solutions are found in tea and single-serve coffee filtration, personal hygiene and packaging products as well as home improvement and industrial applications. Headquartered in Charlotte, NC, the Company’s annualized net sales approximate $916 million with customers in over 100 countries and approximately 2,415 employees worldwide. Operations include eleven manufacturing facilities located in the United States, Canada, Germany, France, the United Kingdom, and the Philippines. Additional information about Glatfelter may be found at www.glatfelter.com.