The Company has unvested restricted stock units outstanding that are considered participating securities and, therefore, computes basic and diluted earnings (loss) per share under the two-class method. Basic earnings (loss) per share for the periods are based upon the weighted average number of shares of common stock outstanding during each period. Diluted earnings per share include the effects of certain stock options and performance stock units. Diluted loss per share excludes the effects of certain stock options and performance stock units because the effect of including them would have been antidilutive.


	Three Months Ended June 30,				Six Months Ended June 30,
	2026		2025		2026		2025
Net income (loss) attributable to Westlake Corporation	$	260	$	(142)	$	91	$	(182)
Less:
Net income (loss) attributable to participating securities	1		(1)		—		(1)
Net income (loss) attributable to common stockholders	$	259	$	(141)	$	91	$	(181)

The following table reconciles the denominator for the basic and diluted earnings (loss) per share computations shown in the consolidated statements of operations:


	Three Months Ended June 30,				Six Months Ended June 30,
	2026		2025		2026		2025
Weighted average common shares—basic	128,039,859		128,238,514		128,016,310		128,273,332
Plus incremental shares from:
Assumed exercise of options and vesting of performance stock units	460,671		—		411,215		—
Weighted average common shares—diluted	128,500,530		128,238,514		128,427,525		128,273,332

Earnings (loss) per common share attributable to Westlake Corporation:
Basic	$	2.02	$	(1.11)	$	0.71	$	(1.42)
Diluted	$	2.01	$	(1.11)	$	0.70	$	(1.42)

Options to purchase 1,124,419 and 1,007,138 shares of common stock for the three months ended June 30, 2026 and 2025, respectively, and 1,025,210 and 769,646 shares of common stock for the six months ended June 30, 2026 and 2025, respectively, are excluded from the computation of diluted earnings per share. These options were outstanding during the periods reported but were excluded because the effect of including them would have been antidilutive. Performance stock units of 168,724 and 191,441 for the three and six months ended June 30, 2025, respectively, were also excluded from the computation of diluted earnings per share, for the respective 2025 periods, because the effect of including them would have been antidilutive.

Dividends declared per common share for the three and six months ended June 30, 2026 and 2025 were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2026		2025		2026		2025
Dividends per common share	$	0.5300	$	0.5250	$	1.0600	$	1.0500