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Stockholders' equity | 9 Months Ended
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Sep. 30, 2025
Stockholders' equity |
Stockholders' equity | Note 14 – Stockholders’ equity: Accumulated other comprehensive loss - Changes in accumulated other comprehensive loss attributable to NL stockholders, including amounts resulting from our investment in Kronos Worldwide (see Note 6), are presented in the table below. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2024 |  | 2025 |  | 2024 |  | 2025
​ | ​ | (In thousands)
Accumulated other comprehensive loss, (net of tax and noncontrolling interest): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Currency translation: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (181,619) | ​ | $ | (177,801) | ​ | $ | (177,119) | ​ | $ | (185,423)
Other comprehensive income (loss) | ​ |  | 1,521 | ​ |  | 30 | ​ |  | (2,979) | ​ |  | 7,652
Balance at end of period | ​ | $ | (180,098) | ​ | $ | (177,771) | ​ | $ | (180,098) | ​ | $ | (177,771)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Defined benefit pension plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (40,616) | ​ | $ | (36,026) | ​ | $ | (41,373) | ​ | $ | (36,666)
Other comprehensive income - | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 378 | ​ |  | 326 | ​ |  | 1,135 | ​ |  | 966
Balance at end of period | ​ | $ | (40,238) | ​ | $ | (35,700) | ​ | $ | (40,238) | ​ | $ | (35,700)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
OPEB plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (1,206) | ​ | $ | (1,331) | ​ | $ | (1,114) | ​ | $ | (1,267)
Other comprehensive loss - | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of net gain included in net periodic OPEB cost | ​ |  | (45) | ​ |  | (31) | ​ |  | (137) | ​ |  | (95)
Balance at end of period | ​ | $ | (1,251) | ​ | $ | (1,362) | ​ | $ | (1,251) | ​ | $ | (1,362)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Marketable debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 7 | ​ | $ | — | ​ | $ | (15) | ​ | $ | —
Other comprehensive income (loss) - unrealized (loss) gain arising during the period | ​ | ​ | (7) | ​ | ​ | — | ​ |  | 15 | ​ |  | —
Balance at end of period | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total accumulated other comprehensive loss: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (223,434) | ​ | $ | (215,158) | ​ | $ | (219,621) | ​ | $ | (223,356)
Other comprehensive income (loss) | ​ | ​ | 1,847 | ​ | ​ | 325 | ​ | ​ | (1,966) | ​ | ​ | 8,523
Balance at end of period | ​ | $ | (221,587) | ​ | $ | (214,833) | ​ | $ | (221,587) | ​ | $ | (214,833)
​ See Note 12 for amounts related to our defined benefit pension plans.

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