ADTN insider buying and SEC filings, explained
ADTRAN Holdings, Inc. · CIK 926282
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Company profile
- Exchanges
- Nasdaq
- Industry (SIC)
- Telephone & Telegraph Apparatus
- Fiscal year end
- Dec 31
- Former names
- ADTRAN INC
Insider activity in the last 12 months
Bought
$500K
Insiders who bought
3
Sold (not marked 10b5-1)
$286K
Planned sales (10b5-1)
$2.2M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Aug 6, 2026 | Purchase (code P) | Timothy P Santo (CFO) bought 6,579 shares at $7.60 ($50K), reported as a purchase (code P). Holdings up 12% to 59,924 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 7, 2026 |
| May 20, 2026 | Sale | James Denson Wilson Jr (Chief Revenue Officer) sold 9,332 shares at about $14.72 ($137K). Holdings down 6% to 143,277 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 22, 2026 |
| May 7–8, 2026 | Planned (10b5-1) | Christoph Glingener (Chief Technology Officer) sold 148,392 shares between May 7 and May 8 at about $14.96 ($2.2M), marked as a 10b5-1 plan trade. Holdings down 76% to 46,645 shares. | SEC filing Filed May 11, 2026 |
| Mar 4, 2026 | Sale | Hourigan Rice Jacqueline (Director) sold 14,406 shares at about $10.29 ($148K). Holdings down 51% to 13,809 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 5, 2026 |
| Nov 28, 2025 | Purchase (code P) | Timothy P Santo (CFO) bought 6,150 shares at $8.02 ($49K), reported as a purchase (code P). Holdings up 30% to 26,594 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 1, 2025 |
| Nov 26, 2025 | Purchase (code P) | Nikos Theodosopoulos (Director) bought 12,859 shares at about $7.81 ($100K), reported as a purchase (code P). Holdings up 33% to 52,154 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 1, 2025 |
| Nov 24, 2025 | Purchase (code P) | Thomas R. Stanton (CEO and Director) bought 40,928 shares at about $7.33 ($300K), reported as a purchase (code P). Holdings up 4% to 982,096 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 25, 2025 |
25 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
3 insiders bought in 30 days
$450K in purchases since Nov 24, 2025 · Purchases traded Nov 24, 2025 to Nov 28, 2025 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Thomas R. Stanton (CEO) | $300K | Nov 24, 2025 | SEC filing |
| Nikos Theodosopoulos (Director) | $100K | Nov 26, 2025 | SEC filing |
| Timothy P Santo (CFO) | $49K | Nov 28, 2025 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
| Filed | Items | Tag | Source |
|---|---|---|---|
| Nov 3, 2026, 8:11 AM ET 8-K | Earnings released (Item 2.02) Reg FD disclosure (Item 7.01) | SEC filing | |
| Oct 29, 2026, 5:25 PM ET 8-K | Executive or director change (Item 5.02) Other event (Item 8.01) | SEC filing |
Red flags are objective triggers only: the item or form filed, never an opinion.
Follow ADTN in the Insider Ledger app
Get the appA plain-English brief of insider purchases, 8-Ks and red flags at the companies you pick. No account needed.