EXHIBIT 99.1

Weyerhaeuser Reports First Quarter Results

SEATTLE, April 30, 2026 – Weyerhaeuser Company (NYSE: WY) today reported first quarter net earnings of $156 million, or 22 cents per diluted share, on net sales of $1.7 billion. This compares with net earnings of $83 million, or 11 cents per diluted share, on net sales of $1.8 billion for the same period last year and net earnings of $74 million for fourth quarter 2025. Excluding an after-tax benefit of $79 million for special items, the company reported first quarter net earnings of $77 million, or 11 cents per diluted share. This compares with a net loss before special items of $67 million for fourth quarter 2025. There were no special items in first quarter 2025. Adjusted EBITDA for first quarter 2026 was $308 million, compared with $328 million for the same period last year and $140 million for fourth quarter 2025.

In February, Weyerhaeuser completed the previously announced divestiture of 108,000 acres of non-core timberlands in Virginia for $192 million. Subsequent to the first quarter, the company received $22 million in proceeds following the transfer of its timber licenses in British Columbia, representing the final proceeds associated with the sale of its Princeton lumber mill.

"Our teams delivered solid operating performance in the first quarter,” said Devin W. Stockfish, president and chief executive officer. “Despite elevated macroeconomic uncertainty, Adjusted EBITDA improved across each of our business segments compared to fourth quarter 2025. In addition, we advanced key growth initiatives in our Wood Products business and made progress on actions to optimize our portfolio. Looking forward, we are encouraged by the recent increase in lumber pricing and are well positioned to navigate a range of market conditions. We maintain a favorable outlook for the longer-term demand fundamentals that support our businesses and remain focused on serving our customers, driving operational excellence and advancing our strategy to accelerate growth and deliver significant long-term value for shareholders."

TIMBERLANDS

Q1 2026 Performance – In the West, fee harvest volumes were slightly higher than the fourth quarter due to more favorable weather conditions. Sales realizations were slightly lower overall due to mix, but were moderately higher for domestic logs. Per unit log and haul costs and forestry and road costs were seasonally lower. In the South, fee harvest volumes were slightly lower than the fourth quarter, primarily due to adverse weather conditions early in the quarter. Sales realizations and per unit log and haul costs were both comparable to the fourth quarter, and forestry and road costs were higher.

First quarter pretax special items include a $58 million gain on the sale of timberlands.

Q2 2026 Outlook – Weyerhaeuser anticipates second quarter earnings before special items and Adjusted EBITDA will be comparable to the first quarter. In the West, the company expects moderately higher fee harvest volumes and slightly higher sales realizations. In the South, the company expects slightly higher fee harvest volumes and comparable sales realizations. In both regions, the company anticipates higher per unit log and haul costs and seasonally higher forestry and road costs.

STRATEGIC LAND SOLUTIONS

Q1 2026 Performance – Earnings and Adjusted EBITDA increased significantly from the fourth quarter due to a $94 million conservation easement transaction in our Climate Solutions business and due to the timing and mix of real estate sales. The number of real estate acres sold was significantly higher and the average price per acre sold was significantly lower, but consistent with historical levels.

Q2 2026 Outlook – Weyerhaeuser anticipates second quarter earnings before special items will be approximately $80 million lower than the first quarter and Adjusted EBITDA will be approximately $70 million lower than the first quarter due to the absence of a large conservation easement transaction, partially offset by higher Real Estate results due to the timing and mix of sales. The company continues to expect full year 2026 Adjusted EBITDA for the segment to be approximately $425 million and now expects basis as a percentage of Strategic Land Solutions sales to be 20 to 30 percent for the full year.

WOOD PRODUCTS

Q1 2026 Performance – Sales realizations for lumber and oriented strand board increased 13 percent and 8 percent, respectively, compared with fourth quarter averages. For lumber, sales volumes were slightly higher, unit manufacturing costs were lower, and log costs were comparable. For oriented strand board, sales volumes and unit manufacturing costs were slightly lower, and fiber costs were slightly higher. For engineered wood products, sales realizations were lower for most products. Sales volumes were slightly higher, primarily for solid section and medium density fiberboard products. Unit manufacturing costs were comparable and raw material costs were higher, primarily for oriented strand board webstock. For distribution, results were higher than the fourth quarter due to increased sales volumes.

First quarter pretax special items include a $28 million product remediation insurance recovery.

Q2 2026 Outlook – Weyerhaeuser anticipates second quarter earnings before special items and Adjusted EBITDA will be comparable to the first quarter, excluding the effect of changes in average sales realizations for lumber and oriented strand board. For lumber, the company expects higher sales volumes, slightly higher log costs, and comparable unit manufacturing costs. For oriented strand board, the company anticipates higher sales volumes and unit manufacturing costs, and moderately higher fiber costs. For engineered wood products, the company expects higher sales volumes, comparable sales realizations, and slightly higher raw material costs. For distribution, the company anticipates slightly higher results compared to the first quarter.

ABOUT WEYERHAEUSER

Weyerhaeuser Company, one of the world's largest private owners of timberlands, began operations in 1900 and today owns or controls more than 10 million acres of timberlands in the U.S., as well as additional public timberlands managed under long-term licenses in Canada. Weyerhaeuser has been a global leader in sustainability for more than a century and manages 100 percent of its timberlands on a fully sustainable basis in compliance with internationally recognized sustainable forestry standards. Weyerhaeuser is also one of the largest manufacturers of wood products in North America and operates additional business lines around product distribution, climate solutions, real estate, and energy and natural resources, among others. In 2025, the company generated $6.9 billion in net sales and employed approximately 9,500 people who serve customers worldwide. Operated as a real estate investment trust, Weyerhaeuser’s common stock trades on the New York Stock Exchange under the symbol WY. Learn more at www.weyerhaeuser.com.

EARNINGS CALL INFORMATION

Weyerhaeuser will hold a live conference call at 7 a.m. Pacific (10 a.m. Eastern) on May 1, 2026, to discuss first quarter results.

To access the live webcast and presentation online, visit the Investors section on www.weyerhaeuser.com on May 1, 2026.

To join the conference call from within North America, dial 1-877-407-0792 (access code: 13755107) at least 15 minutes prior to the call. Those calling from outside North America should dial 201-689-8263 (access code: 13755107). Replays will be available for two weeks at 1-844-512-2921 (access code: 13755107) from within North America, and at 1-412-317-6671 (access code: 13755107) from outside North America.

FORWARD-LOOKING STATEMENTS

This earnings release contains statements concerning the company's future results and performance that are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including, but not limited to, with respect to our outlook and expectations concerning the following: our future operating performance and ability to operate through a range of market conditions; long-term demand drivers for our products; driving operational excellence; advancing our growth strategy and delivering long-term shareholder value and returns; second quarter earnings before special items and Adjusted EBITDA for our Timberlands, Strategic Land Solutions and Wood Products segments; fee harvest volumes, sales realizations, per unit log and haul costs and forestry and road costs for our Timberlands segment; full year Adjusted EBITDA and basis as a percentage of sales for our Strategic Land Solutions segment, as well as expected results from the Real Estate business; sales volumes, log and fiber costs and unit manufacturing costs for our lumber and oriented strand board businesses; sales volumes, sales realizations and raw material costs for our engineered wood products business; and expected second quarter results for our distribution business. Forward-looking statements can be identified by the fact that they do not relate strictly to historical or current facts. They often involve use of words and expressions such as “anticipate,” “expect,” “outlook,” “will” and similar words and expressions or reference events to occur in a future time period or by a future date. They may use the positive, negative or another variation of those and similar words and expressions. These forward-looking statements are based on our current expectations and assumptions and are not guarantees of future events or performance. The realization of our expectations and the accuracy of our assumptions are subject to a number of risks and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements. These risks and uncertainties include, but are not limited to:

It is not possible to predict or identify all risks and uncertainties that might affect the accuracy of our forward-looking statements and, consequently, our descriptions of such risks and uncertainties should not be considered exhaustive. There is no guarantee that any of the events anticipated by these forward-looking statements will occur, and if any of the events do occur, there is no guarantee what effect they will have on the company's business, results of operations, cash flows, financial condition and future prospects.

Forward-looking statements speak only as of the date they are made, and we undertake no obligation to update our forward-looking statements after the date of this earnings release.

RECONCILIATION OF ADJUSTED EBITDA TO NET EARNINGS

We reconcile Adjusted EBITDA to net earnings for the consolidated company and to operating income (loss) for the business segments, as those are the most directly comparable U.S. GAAP measures for each.

The table below reconciles Adjusted EBITDA for the quarter ended December 31, 2025:

The table below reconciles Adjusted EBITDA for the quarter ended March 31, 2026:

The table below reconciles Adjusted EBITDA for the quarter ended March 31, 2025:

RECONCILIATION OF NET EARNINGS BEFORE SPECIAL ITEMS TO NET EARNINGS (INCOME TAX AFFECTED)

We reconcile net earnings before special items to net earnings and net earnings per diluted share before special items to net earnings per diluted share, as those are the most directly comparable U.S. GAAP measures. We believe the measures provide meaningful supplemental information for investors about our operating performance, better facilitate period to period comparisons and are widely used by analysts, lenders, rating agencies and other interested parties.

The table below reconciles net earnings before special items to net earnings:

The table below reconciles net earnings per diluted share before special items to net earnings per diluted share:

RECONCILIATION OF ADJUSTED FAD TO NET CASH FROM OPERATIONS

We reconcile Adjusted FAD to net cash from operations, as that is the most directly comparable U.S. GAAP measure. We believe the measure provides meaningful supplemental information for investors about our liquidity.

The table below reconciles Adjusted FAD to net cash from operations: