Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands |
Total |
Adtran Networks SE [Member] |
Common Stock [Member] |
Additional Paid-in Capital [Member] |
Additional Paid-in Capital [Member]
Adtran Networks SE [Member]
|
Retained Deficit Earnings [Member] |
Treasury Stock [Member] |
Accumulated Other Comprehensive Income [Member] |
| Beginning Balance at Dec. 31, 2024 |
$ 126,951
|
|
$ 795
|
$ 808,913
|
|
$ (688,813)
|
$ (5,198)
|
$ 11,254
|
| Beginning Balance, Shares at Dec. 31, 2024 |
|
|
79,483
|
|
|
|
|
|
| Net (loss) income |
(8,948)
|
|
|
|
|
(8,948)
|
|
|
| Annual recurring compensation earned |
(2,319)
|
|
|
|
|
(2,319)
|
|
|
| Other comprehensive income (loss), net of tax |
20,378
|
|
|
|
|
|
|
20,378
|
| Deferred compensation adjustments, net of tax |
38
|
|
|
(52)
|
|
|
90
|
|
| ADTRAN RSUs and restricted stock vested |
(1,170)
|
|
$ 4
|
|
|
(1,174)
|
|
|
| ADTRAN RSUs and restricted stock vested, Shares |
|
|
373
|
|
|
|
|
|
| ADTRAN Stock options exercised |
756
|
|
$ 1
|
|
|
755
|
|
|
| ADTRAN Stock options exercised, Shares |
|
|
113
|
|
|
|
|
|
| ADTRAN Stock-based compensation expense |
2,062
|
$ 1,148
|
|
2,062
|
$ 1,148
|
|
|
|
| Redemption of redeemable non-controlling interest |
(3)
|
|
|
|
|
(3)
|
|
|
| Ending Balance at Mar. 31, 2025 |
138,893
|
|
$ 800
|
812,071
|
|
(700,502)
|
(5,108)
|
31,632
|
| Ending Balance, Shares at Mar. 31, 2025 |
|
|
79,969
|
|
|
|
|
|
| Beginning Balance at Dec. 31, 2024 |
126,951
|
|
$ 795
|
808,913
|
|
(688,813)
|
(5,198)
|
11,254
|
| Beginning Balance, Shares at Dec. 31, 2024 |
|
|
79,483
|
|
|
|
|
|
| Other comprehensive income (loss), net of tax |
67,101
|
|
|
|
|
|
|
|
| Ending Balance at Jun. 30, 2025 |
169,613
|
|
$ 800
|
814,749
|
|
(719,183)
|
(5,108)
|
78,355
|
| Ending Balance, Shares at Jun. 30, 2025 |
|
|
80,041
|
|
|
|
|
|
| Beginning Balance at Mar. 31, 2025 |
138,893
|
|
$ 800
|
812,071
|
|
(700,502)
|
(5,108)
|
31,632
|
| Beginning Balance, Shares at Mar. 31, 2025 |
|
|
79,969
|
|
|
|
|
|
| Net (loss) income |
(18,258)
|
|
|
|
|
(18,258)
|
|
|
| Annual recurring compensation earned |
(2,273)
|
|
|
|
|
(2,273)
|
|
|
| Other comprehensive income (loss), net of tax |
46,723
|
|
|
|
|
|
|
46,723
|
| ADTRAN RSUs and restricted stock vested |
(54)
|
|
|
|
|
(54)
|
|
|
| ADTRAN RSUs and restricted stock vested, Shares |
|
|
12
|
|
|
|
|
|
| ADTRAN Stock options exercised |
410
|
|
|
|
|
410
|
|
|
| ADTRAN Stock options exercised, Shares |
|
|
60
|
|
|
|
|
|
| ADTRAN Stock-based compensation expense |
2,678
|
|
|
2,678
|
|
|
|
|
| Redemption of redeemable non-controlling interest |
1,494
|
|
|
|
|
1,494
|
|
|
| Ending Balance at Jun. 30, 2025 |
169,613
|
|
$ 800
|
814,749
|
|
(719,183)
|
(5,108)
|
78,355
|
| Ending Balance, Shares at Jun. 30, 2025 |
|
|
80,041
|
|
|
|
|
|
| Beginning Balance at Dec. 31, 2025 |
$ 145,830
|
|
$ 802
|
801,269
|
|
(730,010)
|
(5,108)
|
78,877
|
| Beginning Balance, Shares at Dec. 31, 2025 |
80,188
|
|
80,188
|
|
|
|
|
|
| Net (loss) income |
$ 930
|
|
|
|
|
930
|
|
|
| Annual recurring compensation earned |
(2,251)
|
|
|
|
|
(2,251)
|
|
|
| Other comprehensive income (loss), net of tax |
(8,831)
|
|
|
|
|
|
|
(8,831)
|
| Dividends accrued on unvested restricted stock units |
(7)
|
|
|
|
|
(7)
|
|
|
| Deferred compensation adjustments, net of tax |
36
|
|
|
(57)
|
|
|
93
|
|
| ADTRAN RSUs and restricted stock vested |
(1,671)
|
|
$ 4
|
|
|
(1,675)
|
|
|
| ADTRAN RSUs and restricted stock vested, Shares |
|
|
398
|
|
|
|
|
|
| ADTRAN Stock options exercised |
1,369
|
|
$ 2
|
|
|
1,367
|
|
|
| ADTRAN Stock options exercised, Shares |
|
|
217
|
|
|
|
|
|
| ADTRAN Stock-based compensation expense |
1,819
|
|
|
1,819
|
|
|
|
|
| Redemption of redeemable non-controlling interest |
301
|
|
|
|
|
301
|
|
|
| Ending Balance at Mar. 31, 2026 |
137,525
|
|
$ 808
|
803,031
|
|
(731,345)
|
(5,015)
|
70,046
|
| Ending Balance, Shares at Mar. 31, 2026 |
|
|
80,803
|
|
|
|
|
|
| Beginning Balance at Dec. 31, 2025 |
$ 145,830
|
|
$ 802
|
801,269
|
|
(730,010)
|
(5,108)
|
78,877
|
| Beginning Balance, Shares at Dec. 31, 2025 |
80,188
|
|
80,188
|
|
|
|
|
|
| Other comprehensive income (loss), net of tax |
$ (14,683)
|
|
|
|
|
|
|
|
| Ending Balance at Jun. 30, 2026 |
$ 129,497
|
|
$ 815
|
805,882
|
|
(736,379)
|
(5,015)
|
64,194
|
| Ending Balance, Shares at Jun. 30, 2026 |
81,453
|
|
81,453
|
|
|
|
|
|
| Beginning Balance at Mar. 31, 2026 |
$ 137,525
|
|
$ 808
|
803,031
|
|
(731,345)
|
(5,015)
|
70,046
|
| Beginning Balance, Shares at Mar. 31, 2026 |
|
|
80,803
|
|
|
|
|
|
| Net (loss) income |
(8,704)
|
|
|
|
|
(8,704)
|
|
|
| Annual recurring compensation earned |
(2,201)
|
|
|
|
|
(2,201)
|
|
|
| Other comprehensive income (loss), net of tax |
(5,852)
|
|
|
|
|
|
|
(5,852)
|
| ADTRAN RSUs and restricted stock vested |
51
|
|
$ 12
|
|
|
51
|
|
|
| ADTRAN Stock options exercised |
5,243
|
|
$ 7
|
|
|
5,236
|
|
|
| ADTRAN Stock options exercised, Shares |
|
|
638
|
|
|
|
|
|
| ADTRAN Stock-based compensation expense |
2,851
|
|
|
2,851
|
|
|
|
|
| Redemption of redeemable non-controlling interest |
584
|
|
|
|
|
584
|
|
|
| Ending Balance at Jun. 30, 2026 |
$ 129,497
|
|
$ 815
|
$ 805,882
|
|
$ (736,379)
|
$ (5,015)
|
$ 64,194
|
| Ending Balance, Shares at Jun. 30, 2026 |
81,453
|
|
81,453
|
|
|
|
|
|