Alexander W. Casdin
CIK 1455228 · last filed 2026-01-05
"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
$9.38M
Companies
4
Total Filings
28
Lifetime Open-Market Net
$7.07M
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 |
|---|---|---|---|---|---|---|---|
| ERAS | Director | 667,724 | $14.05 | $9.38M | $384.4K | 13 | 2026-01-05 |
| Sientra, Inc. (SIEN) Delisted | Director | 252,099 | $0.17 | $43.9K | $0 | 1 | 2023-06-20 |
| Ignyta, Inc. (RXDX) Delisted | Director | 806,464 | $199.92 | $161.23M | $6.69M | 6 | 2017-06-19 |
| DUSA | Director | 0 | $56.18 | $0 | $0 | 7 | 2012-12-20 |
Recent Filings · Page 2 of 3
28 filingsForm 4 transactions across all companies, newest first.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2022-12-15 | ERAS | Buy (P) | +20,000 | $97.5K | EDGAR |
| 2022-07-06 | ERAS | Other (J) | −750,000 | $0 | EDGAR |
| 2022-06-24 | ERAS | Grant (A) | — | $0 | EDGAR |
| 2021-07-20 | ERAS | Conv (C) | +900,000 | $0 | EDGAR |
| 2018-02-12 | — | Disp (D) | −806,464 | -$21.77M | |
| 2017-06-19 | Ignyta, Inc. (RXDX) Delisted | Grant (A) | — | $0 | EDGAR |
| 2016-06-15 | Ignyta, Inc. (RXDX) Delisted | Grant (A) | — | $0 | EDGAR |
| 2016-05-04 | Ignyta, Inc. (RXDX) Delisted | Buy (P) | +232,000 | $1.45M | EDGAR |
| 2016-03-11 | Ignyta, Inc. (RXDX) Delisted | Grant (A) | — | $0 | EDGAR |
| 2015-06-23 | Ignyta, Inc. (RXDX) Delisted | Buy (P) | +65,714 | $1.15M | 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.