Exhibit 99.1
FOR IMMEDIATE RELEASE
Kaiser Aluminum Corporation Announces Filing of
Shelf Registration Statement for VEBA Trust
Shelf Registration Statement for VEBA Trust
FOOTHILL
RANCH, Calif., April 2, 2010 — Kaiser Aluminum Corporation (NASDAQ:KALU) today
announced the filing of a shelf registration statement covering the possible sale from time to time
by a voluntary employees’ beneficiary association (VEBA) trust of up to 4,392,265 shares of Kaiser
Aluminum’s common stock. The shares being registered were distributed by Kaiser Aluminum to the
VEBA trust when the Company emerged from chapter 11 bankruptcy in July 2006. The filing of the
registration statement by Kaiser Aluminum was made in response to a demand by the VEBA trust under
a registration rights agreement entered into by Kaiser Aluminum and the VEBA trust in July 2006.
Pursuant to a stock transfer restriction agreement that Kaiser Aluminum entered into with the
trustee of the VEBA trust in July 2006, the VEBA trust may not sell more than 1,321,485 shares of
Kaiser Aluminum’s common stock in any 12-month period without consent of Kaiser Aluminum’s board of
directors. Currently, under these restrictions, the VEBA trust is limited to the sale of 868,285
shares prior to March 24, 2011.
The registration statement relating to these securities has been filed with the Securities and
Exchange Commission, but has not yet become effective. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes effective. You may
obtain a copy of the prospectus included in the registration statement from the Securities and
Exchange Commission’s website at http://www.sec.gov. Alternatively, you may obtain a copy of the
prospectus included in the registration statement by writing Kaiser Aluminum at the following
address: Investor Relations Department, Kaiser Aluminum Corporation, 27422 Portola Parkway, Suite
200, Foothill Ranch, California, 92610-2831.
Kaiser Aluminum Corporation, headquartered in Foothill Ranch, Calif., is a leading producer of
semi-fabricated specialty aluminum products, serving customers worldwide with highly-engineered
solutions for aerospace and high-strength, general engineering, and custom automotive and
industrial applications. The Company’s North American facilities produce value-added sheet, plate,
extrusions, forgings, rod, bar and tube products.
Certain statements in this press release may constitute “forward-looking statements” within
the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements
can be identified by the use of forward-looking terminology such as “expects,” “may” or “will” or
the negative of the foregoing or other variations or comparable terminology, or by discussions of
strategy or intentions. These statements are based on the beliefs and assumptions of Kaiser
Aluminum’s management based on information available to management at the time such statements are
made. Readers are cautioned that any such forward-looking statements are not guarantees of future
performance or events and involve significant risks and uncertainties, and that actual results or
events may vary materially from those in the forward-looking statements as a result of various
factors. These