BETH C SEIDENBERG
CIK 1184592 · last filed 2026-06-15
"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
$42.05M
Companies
10
Total Filings
108
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 |
|---|---|---|---|---|---|---|---|
| SGMT | Director | 84,768 | $7.27 | $616.3K | $750.0K | 4 | 2026-06-15 |
| KYTX | Director | 3,809,667 | $7.49 | $28.53M | $1000.0K | 4 | 2026-05-29 |
| VERA | Director | 135,565 | $33.32 | $4.52M | $2.90M | 21 | 2026-05-26 |
| ACELYRIN, Inc. (SLRN) Delisted | Director | 9,850,729 | $2.27 | $22.36M | $23.58M | 2 | 2024-06-11 |
| PGNY | Director | 271,322 | $30.76 | $8.35M | -$2.80M | 24 | 2024-05-28 |
| ATRA | Director | 4,636 | $7.81 | $36.2K | $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 | — | $9.74 | — | $0 | 4 | 2010-05-17 |
Recent Filings · Page 5 of 11
108 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 |
|---|---|---|---|---|---|
| 2022-06-27 | ATRA | Grant (A) | +20,500 | $0 | EDGAR |
| 2022-05-26 | VERA | Grant (A) | — | $0 | EDGAR |
| 2021-12-27 | PGNY | Other (J) | −4,015 | $0 | EDGAR |
| 2021-11-18 | PGNY | Other (J) | −905,586 | $0 | EDGAR |
| 2021-10-26 | PGNY | Mixed | −29,708 | $0 | EDGAR |
| 2021-07-21 | PGNY | Other (J) | −8,500 | $0 | EDGAR |
| 2021-06-23 | PGNY | Mixed | −1,357,598 | $0 | EDGAR |
| 2021-06-09 | ATRA | Grant (A) | +11,000 | $0 | EDGAR |
| 2021-05-18 | VERA | Conv (C) | +1,343,152 | $0 | EDGAR |
| 2021-05-17 | VERA | 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.