BETH C SEIDENBERG
CIK 1184592 · 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
$44.31M
Companies
10
Total Filings
103
Lifetime Open-Market Net
$67.69M
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 |
|---|---|---|---|---|---|---|---|
| KYTX | Director | 3,809,667 | $8.05 | $30.69M | $1000.0K | 4 | 2026-05-29 |
| VERA | Director | 135,565 | $34.26 | $4.64M | $2.90M | 21 | 2026-05-26 |
| SGMT | Director | 84,768 | $6.48 | $549.3K | $750.0K | 3 | 2025-06-10 |
| ACELYRIN, Inc. (SLRN) Delisted | Director | 9,850,729 | $2.27 | $22.36M | $23.58M | 2 | 2024-06-11 |
| PGNY | Director | 271,322 | $26.63 | $7.23M | -$2.80M | 24 | 2024-05-28 |
| ATRA | Director | 115,886 | $10.41 | $1.21M | $0 | 15 | 2023-06-02 |
| Epizyme, Inc. (EPZM) Delisted | Director | 4,124,036 | $1.47 | $6.06M | -$10.74M | 11 | 2019-07-02 |
| ARMO BioSciences, Inc. (ARMO) Delisted | Director | 0 | — | — | $0 | 3 | 2018-06-22 |
| TESARO, Inc. (TSRO) Delisted | Director | 2,040,675 | — | — | $53.00M | 13 | 2018-06-05 |
| BCRX | Director | — | $8.70 | — | $0 | 4 | 2010-05-17 |
Recent Filings · Page 8 of 11
103 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2018-01-30 | ARMO BioSciences, Inc. (ARMO) Delisted | Conv (C) | +4,266,683 | $0 | EDGAR |
| 2017-12-15 | TESARO, Inc. (TSRO) Delisted | Other (J) | −13,219 | $0 | EDGAR |
| 2017-09-11 | TESARO, Inc. (TSRO) Delisted | Other (J) | −701,941 | $0 | EDGAR |
| 2017-06-26 | Epizyme, Inc. (EPZM) Delisted | Grant (A) | — | $0 | EDGAR |
| 2017-06-12 | ATRA | Grant (A) | +5,000 | $0 | EDGAR |
| 2017-06-05 | TESARO, Inc. (TSRO) Delisted | Grant (A) | +402 | $0 | EDGAR |
| 2017-01-05 | ATRA | Grant (A) | +2,000 | $0 | EDGAR |
| 2016-07-06 | Epizyme, Inc. (EPZM) Delisted | Grant (A) | +3,200 | $33.1K | EDGAR |
| 2016-06-03 | TESARO, Inc. (TSRO) Delisted | Grant (A) | +1,269 | $0 | EDGAR |
| 2016-05-23 | Epizyme, Inc. (EPZM) Delisted | Grant (A) | — | $0 | EDGAR |
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.