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ADTN ADTRAN Holdings, Inc. Insider Trading

Latest: CTO Sold $2.2M of Shares · May 2026

Multiple insiders have been active at ADTRAN Holdings, Inc. (ADTN): 4 distinct insiders account for 3 buy filings and 1 sell filing as of May 2026. Its highest-significance filing in the last 90 days: CTO Glingener Christoph sold $2.2M, transaction dated May 2026.

4 filings analyzed · Latest 2026-05-11

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Buys
3
Sells
1
Insiders
4
Direction
Net buying

ADTRAN Holdings, Inc. leadership

CEO
Thomas R. Stanton — Chief Executive Officer
CFO
Timothy Santo — Chief Financial Officer
Chair
Thomas R. Stanton — Chairman of the Board

Historically, stocks have lagged the S&P 500 by a median ~3% over the 90 days after a low insider sell (n ≈ 1,162, 2024-2026). Past results don't predict the future. How we measure this ↗

May 2026
2026-05-11 10b5-1 Plan
low
Chief Technology Officer
148,392 shares
$2,219,844
@ $14.96
Significance 4

CTO Glingener exercises stock options and immediately sells all shares for net proceeds above exercise value.

Glingener, ADTN's Chief Technology Officer, exercised three tranches of stock options and sold all 148,392 acquired shares within two trading days, realizing roughly $2.2M in proceeds while the stock trades nearly a fifth below its 52-week high. The mechanics are straightforward: he acquired shares at weighted-average prices between $7.01 and $12.17 per share and sold them at prices ranging from $14.73 to $15.06, capturing the spread between strike and market. This is Glingener's first open-market sales in the 36-month window and reflects standard option exercise-and-sell behavior—a liquidity event rather than a discretionary trading signal. The company itself is unprofitable year-to-date, though it has grown revenue substantially, and the stock's recent rally provides the context for why the options became valuable enough to exercise now. Without evidence of prior open-market purchases by this executive, this transaction does not indicate conviction in the company's direction; it is a compensation realization opportunity.

December 2025
2025-12-01
medium
SVP of Finance; CFO
6,150 shares
$49,323
@ $8.02
Significance 6

CFO Santo Timothy P bought 6,150 shares at $8.02 amid stock down 24.1% in 30 days; cluster pattern with 2 other insiders buying in past 14 days.

CFO Santo Timothy P purchased 6,150 shares at $8.02, increasing his holdings by 30.1% to 26,594 shares. The buy occurred as ADTN stock has fallen 24.1% over the past 30 days and 33.1% from its 52-week high of $11.83, trading at $7.91. Notably, this purchase is part of a cluster pattern, with 2 other insiders also buying within the past 14 days. The company is operating under headwinds—annual revenue declined 19.7%, and the most recent fiscal year showed a net loss of $-10,262,000.00, indicating operational challenges alongside the recent price weakness.

2025-12-01
high
12,859 shares
$100,429
@ $7.81
Significance 7

ADTN Director Nikos Theodosopoulos bought 12,859 shares at $7.81; cluster buy pattern with 2 other insiders in 14 days amid -19.7% revenue decline

Director Theodosopoulos purchased 12,859 shares for $100,428.79 on 2025-11-26, increasing his holdings by 32.7% to 52,154 shares. This transaction is part of a cluster buy pattern—2 other insiders also purchased within the past 14 days. While his cross-ticker track record shows strong prior outcomes (2 prior buys with 100.00% 90d win rate and avg 90d return +8.8%), the fundamental backdrop is concerning: ADTN reported -19.7% annual revenue decline, negative full-year net income of -$10,262,000.00, and the stock is -33.1% from its 52-week high of $11.83 and down -24.1% over the past 30 days. The convergence of multiple insider purchases into a declining company at a depressed price point merits examination of whether insiders view the valuation as representative of near-term recovery prospects or if other strategic developments are underway.

November 2025
2025-11-25
high
Chairman & CEO
40,928 shares
$300,002
@ $7.33
Significance 6

ADTRAN CEO Stanton buys 40,928 shares at $7.33 amid -19.7% revenue decline, $-10.3M loss

Stanton Thomas R, Chairman & CEO, purchased 40,928 shares at $7.33 on 2025-11-24 for a total value of $300,002.24, increasing his holdings from 941,167 to 982,095 shares (a +4.3% addition). This open-market purchase occurs as ADTRAN operates under significant financial pressure: the company reported negative net income of $-10.3M in the latest full fiscal year and annual revenue declined -19.7% year-over-year, while current market price of $7.70 remains 34.9% below the 52-week high of $11.83. The timing follows a 23.5% decline over the prior 30 days, leaving the stock at the lower end of its 52-week range. While a CEO's personal investment in company equity at a depressed valuation warrants investor attention, the combination of deteriorating operating results and recent price weakness raises questions about whether this purchase reflects confidence in near-term recovery or is consistent with other board actions and guidance.

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