Martin H. Jr. Huber
CIK 1653276 · President, CEO · last filed 2026-05-22
"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
$2.02M
Companies
5
Total Filings
44
Lifetime Open-Market Net
-$805.0K
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 |
|---|---|---|---|---|---|---|---|
| ACTU | Director | — | $1.06 | — | $0 | 1 | 2026-05-22 |
| SNDX | Director | 103,000 | $19.63 | $2.02M | $45.0K | 7 | 2026-02-06 |
| Mersana Therapeutics, Inc. (MRSN) Delisted | President, CEO | 0 | $29.08 | $0 | -$106.1K | 15 | 2026-01-06 |
| XLO | PRESIDENT AND HEAD OF R&D | — | $9.15 | — | $0 | 6 | 2023-08-18 |
| TESARO, Inc. (TSRO) Delisted | SVP & Chief Medical Officer | 0 | — | — | -$743.9K | 14 | 2019-01-22 |
Recent Filings · Page 3 of 5
44 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 |
|---|---|---|---|---|---|
| 2022-06-17 | XLO | Grant (A) | — | $0 | EDGAR |
| 2022-06-10 | Mersana Therapeutics, Inc. (MRSN) Delisted | Grant (A) | — | $0 | EDGAR |
| 2022-02-24 | XLO | Grant (A) | — | $0 | EDGAR |
| 2022-02-03 | SNDX | Grant (A) | +16,000 | $0 | EDGAR |
| 2022-01-05 | Mersana Therapeutics, Inc. (MRSN) Delisted | Grant (A) | — | $0 | EDGAR |
| 2021-10-25 | XLO | Grant (A) | — | $0 | EDGAR |
| 2021-09-17 | SNDX | Grant (A) | — | $0 | EDGAR |
| 2021-06-15 | Mersana Therapeutics, Inc. (MRSN) Delisted | Grant (A) | — | $0 | EDGAR |
| 2021-01-20 | Mersana Therapeutics, Inc. (MRSN) Delisted | Grant (A) | — | $0 | EDGAR |
| 2020-06-24 | Mersana Therapeutics, Inc. (MRSN) Delisted | Grant (A) | — | $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.