| 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 | | Six months ended | | | June 30, | | June 30, | | | 2024 | | 2025 | | 2024 | | 2025 | | | | (In thousands) | Accumulated other comprehensive loss, (net of tax and noncontrolling interest): | | | | | | | | | | | | | Currency translation: | | | | | | | | | | | | | Balance at beginning of period | | $ | (182,085) | | $ | (181,238) | | $ | (177,119) | | $ | (185,423) | Other comprehensive income (loss) | | | 466 | | | 3,437 | | | (4,500) | | | 7,622 | Balance at end of period | | $ | (181,619) | | $ | (177,801) | | $ | (181,619) | | $ | (177,801) | | | | | | | | | | | | | | Defined benefit pension plans: | | | | | | | | | | | | | Balance at beginning of period | | $ | (40,994) | | $ | (36,349) | | $ | (41,373) | | $ | (36,666) | Other comprehensive income - | | | | | | | | | | | | | Amortization of prior service cost and net losses included in net periodic pension cost | | | 378 | | | 323 | | | 757 | | | 640 | Balance at end of period | | $ | (40,616) | | $ | (36,026) | | $ | (40,616) | | $ | (36,026) | | | | | | | | | | | | | | OPEB plans: | | | | | | | | | | | | | Balance at beginning of period | | $ | (1,161) | | $ | (1,300) | | $ | (1,114) | | $ | (1,267) | Other comprehensive loss - | | | | | | | | | | | | | Amortization of net gain included in net periodic OPEB cost | | | (45) | | | (31) | | | (92) | | | (64) | Balance at end of period | | $ | (1,206) | | $ | (1,331) | | $ | (1,206) | | $ | (1,331) | | | | | | | | | | | | | | Marketable debt securities: | | | | | | | | | | | | | Balance at beginning of period | | $ | — | | $ | — | | $ | (15) | | $ | — | Other comprehensive income - unrealized gain arising during the period | | | 7 | | | — | | | 22 | | | — | Balance at end of period | | $ | 7 | | $ | — | | $ | 7 | | $ | — | | | | | | | | | | | | | | Total accumulated other comprehensive loss: | | | | | | | | | | | | | Balance at beginning of period | | $ | (224,240) | | $ | (218,887) | | $ | (219,621) | | $ | (223,356) | Other comprehensive income (loss) | | | 806 | | | 3,729 | | | (3,813) | | | 8,198 | Balance at end of period | | $ | (223,434) | | $ | (215,158) | | $ | (223,434) | | $ | (215,158) |
See Note 12 for amounts related to our defined benefit pension plans.
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