Updated Jul 16, 2026 · Last SEC filing 2026-07-13
Twist Bioscience Corp (TWST) has filed 35 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-07-13. 1 Form 8-K material event filings were reported by TWST in the last 90 days. 37 Form 144 notices of proposed sale were filed for TWST stock. InsiderAlpha tracks every TWST SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Biological Products, (No Diagnostic Substances) (SIC 2836) |
|---|---|
| SEC CIK | 0001581280 |
| Form 4 filings (90d) | 35 |
|---|---|
| Form 8-K filings (90d) | 1 |
| Form 144 notices (90d) | 37 |
| Latest Form 4 filing | 2026-07-13 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Laponis Adam | Chief Financial Officer | S — Open-market sale | 2.4K | $94.33 | $226K | SEC | |
| Leproust Emily M. | Chief Executive Officer | S — Open-market sale | 18.9K | $95.00 | $1.79M | SEC | |
| Cho Dennis | See Remarks | S — Open-market sale | 14.2K | $89.75 | $1.27M | SEC | |
| Green Paula | SVP of Human Resources | S — Open-market sale | 291 | $87.32 | $25K | SEC | |
| Cho Dennis | See Remarks | S — Open-market sale | 346 | $87.32 | $30K | SEC | |
| Leproust Emily M. | Chief Executive Officer | S — Open-market sale | 1.7K | $87.32 | $147K | SEC | |
| Green Paula | SVP of Human Resources | M — Option exercise | 26.1K | $23.33 | $610K | SEC | |
| Green Paula | SVP of Human Resources | S — Open-market sale | 24.1K | $81.62 | $1.97M | SEC | |
| Green Paula | SVP of Human Resources | S — Open-market sale | 2.0K | $82.17 | $167K | SEC | |
| WERNER ROBERT F. | Chief Accounting Officer | S — Open-market sale | 1.1K | $69.07 | $78K | SEC | |
| WERNER ROBERT F. | Chief Accounting Officer | G — Bona-fide gift | 500 | $0.00 | — | SEC | |
| Green Paula | SVP of Human Resources | S — Open-market sale | 884 | $69.84 | $62K | SEC | |
| Leproust Emily M. | Chief Executive Officer | S — Open-market sale | 2.3K | $69.84 | $158K | SEC | |
| WERNER ROBERT F. | Chief Accounting Officer | S — Open-market sale | 232 | $69.84 | $16K | SEC | |
| Cho Dennis | See Remarks | S — Open-market sale | 402 | $69.84 | $28K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for Twist Bioscience Corp (TWST). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Leproust Emily M. | 25 | $8.39M |
| Green Paula | 8 | $2.97M |
| WERNER ROBERT F. | 7 | $472K |
| Cho Dennis | 6 | $2.52M |
| Laponis Adam | 4 | $854K |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in TWST insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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