Xiaoying Mai
CIK 1754806 · View on SEC EDGAR ↗
Insider
First SEC filing: Oct. 30, 2018 · Latest: Oct. 30, 2018
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 7 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
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Feb. 6, 2024 | TWST | A | 5,815 | — | — | 31,057 Direct | +23.04% | Acquired | (price as of 2026-08-20) |
| Feb. 7, 2023 | TWST | A | 8,212 | — | — | 25,242 Direct | +48.22% | Acquired | (price as of 2026-08-20) |
| Feb. 8, 2022 | TWST | A | 3,491 | — | — | 17,030 Direct | +25.78% | Acquired | (price as of 2026-08-20) |
| Feb. 7, 2022 | TWST | A | 973 | — | — | 973 Direct | — | Acquired | (price as of 2026-08-20) |
| Feb. 7, 2022 | TWST | A | 11,297 | — | — | 11,297 Direct | — | Acquired | (price as of 2026-08-20) |
| Feb. 7, 2022 | TWST | A | 10,588 | — | — | 10,588 Direct | — | Acquired | (price as of 2026-08-20) |
| Feb. 7, 2022 | TWST | A | 13,539 | — | — | 13,539 Direct | — | Acquired | (price as of 2026-08-20) |
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 |
|---|---|---|---|---|---|---|---|
| Feb. 7, 2022 | TWST | Director Stock Option (right to buy) | Common Stock (973) | $189.96 | Feb. 2, 2031 | 973 | Acquired |
| Feb. 7, 2022 | TWST | Director Stock Option (right to buy) | Common Stock (11,297) | $60.33 | Feb. 3, 2030 | 11,297 | Acquired |
| Feb. 7, 2022 | TWST | Director Stock Option (right to buy) | Common Stock (10,588) | $60.33 | July 22, 2029 | 10,588 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Oct. 30, 2018 | TWST | Common Stock | 0 | Direct |