Alexander W. Casdin
CIK 1455228 · View on SEC EDGAR ↗
Insider
First SEC filing: July 15, 2021 · Latest: July 15, 2021
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 13 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
13 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| May 21, 2024 | ERAS | P | 80,000 | $2.27 | $181,600 | 573,974 Direct | +16.20% | Acquired | 676.7% (price as of 2026-08-21) |
| Dec. 4, 2023 | ERAS | P | 30,000 | $1.66 | $49,800 | 493,974 Direct | +6.47% | Acquired | 962.0% (price as of 2026-08-21) |
| April 10, 2023 | ERAS | P | 20,000 | $2.76 | $55,200 | 463,974 Direct | +4.50% | Acquired | 538.8% (price as of 2026-08-21) |
| Dec. 15, 2022 | ERAS | P | 20,000 | $4.87 | $97,400 | 443,974 Direct | +4.72% | Acquired | 262.0% (price as of 2026-08-21) |
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| June 26, 2026 | ERAS | Stock option (right to buy) | Common Stock (29,888) | $16.01 | June 26, 2036 | 29,888 | Acquired |
| Jan. 1, 2026 | ERAS | Stock Option (right to buy) [F1] | Common Stock (23,872) | $3.72 | Jan. 1, 2036 | 23,872 | Acquired |
| June 24, 2025 | ERAS | Stock option (right to buy) | Common Stock (120,000) | $1.45 | June 23, 2035 | 120,000 | Acquired |
| Jan. 1, 2025 | ERAS | Stock Option (right to buy) [F1] | Common Stock (28,877) | $2.51 | Jan. 1, 2035 | 28,877 | Acquired |
| June 20, 2024 | ERAS | Stock Option (right to buy) | Common Stock (60,000) | $2.03 | June 19, 2034 | 60,000 | Acquired |
| Jan. 1, 2024 | ERAS | Stock Option (right to buy) | Common Stock | $2.13 | Jan. 1, 2034 | 41,084 | Acquired |
| June 22, 2023 | ERAS | Stock Option (right to buy) | Common Stock (60,000) | $2.66 | June 21, 2033 | 60,000 | Acquired |
| June 22, 2022 | ERAS | Stock Option (right to buy) | Common Stock (40,000) | $5.35 | June 22, 2032 | 40,000 | Acquired |
| July 20, 2021 | ERAS | Series A Preferred Stock | Common Stock (750,000) | $0.00 | — | 900,000 | Disposed |
| July 20, 2021 | ERAS | Series A Preferred Stock | Common Stock (150,000) | $0.00 | — | 180,000 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 3 holdings
Securities held when first becoming an insider, per SEC Form 3.