Severin Hacker
CIK 1870272 · Chief Tech Officer, Co-Founder · last filed 2026-05-29
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$9.6K
Companies
1
Total Filings
82
Lifetime Open-Market Net
-$225.09M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| DUOL | Chief Tech Officer, Co-Founder | 72 | $132.75 | $9.6K | -$225.09M | 73 | 2026-05-29 |
Recent Filings · Page 4 of 9
82 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2025-01-07 | DUOL | Mixed | — | -$3.36M | EDGAR |
| 2025-01-03 | DUOL | Mixed | — | $0 | EDGAR |
| 2024-12-20 | DUOL | Mixed | — | -$3.37M | EDGAR |
| 2024-12-19 | DUOL | Notice (144) | −60,000 | -$19.97M | EDGAR |
| 2024-12-16 | DUOL | Mixed | — | -$14.85M | EDGAR |
| 2024-12-13 | DUOL | Mixed | — | -$14.13M | EDGAR |
| 2024-12-13 | DUOL | Mixed | — | -$64.14M | EDGAR |
| 2024-12-11 | DUOL | Notice (144) | −274,248 | -$99.23M | EDGAR |
| 2024-12-02 | DUOL | Mixed | — | $0 | EDGAR |
| 2024-11-27 | DUOL | Tax (F) | — | $0 | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.