SEC Form 4
Twist Bioscience Corporation (TWST) insider trading
In the 12 months to Oct 26, 2026, 9 TWST insiders reported open-market sales of $117.6M across 38 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $117.6M
- 38 filings · 9 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 31 of 38
- $111.9M of $117.6M sold (95%)
Who traded TWST, and when
- Sale
- Sale, pre-arranged (10b5-1)
TWST daily close from Oct 27, 2025 to Oct 26, 2026, between $25.45 and $205.00, last $145.70. 38 sale and 0 purchase filings by 9 insiders, marked at their filing dates. Emily M. Leproust, Chief Executive Officer: sold $88.1M across 11 filings, first filed Apr 23, 2026, last Oct 7, 2026. Patrick John Finn, President and COO: sold $14.0M across 4 filings, first filed Jan 15, 2026, last Aug 20, 2026. Dennis Cho, Officer (see filing): sold $5.9M across 5 filings, first filed Feb 13, 2026, last Aug 21, 2026. Paula Green, SVP of Human Resources: sold $4.2M across 2 filings, first filed Feb 19, 2026, last Jun 17, 2026. Robert Chess, Director: sold $2.5M across 2 filings, first filed Mar 19, 2026, last Aug 11, 2026. Adam Laponis, Chief Financial Officer: sold $1.2M across 5 filings, first filed Jan 15, 2026, last Jun 2, 2026. 3 others: sold $1.8M across 9 filings, first filed Nov 20, 2025, last Jun 10, 2026.
Largest mark · tap a row for others
Emily M. Leproust · Chief Executive Officer
Filing 1 of 2 within a week · $57,253,631 total
Sale $56,330,724
356,546 shares at $157.99 avg
Filed Sep 21, 2026 · traded Sep 17
Pre-arranged (10b5-1) · close on filing date $165.83
Emily M. Leproust · Chief Executive Officer
Chief Executive Officer
$88.1M soldPatrick John Finn · President and COO
President and COO
$14.0M soldDennis Cho · Officer (see filing)
Officer (see filing)
$5.9M soldPaula Green · SVP of Human Resources
SVP of Human Resources
$4.2M soldRobert Chess · Director
Director
$2.5M soldAdam Laponis · Chief Financial Officer
Chief Financial Officer
$1.2M sold3 others
Combined, one mark per week
$1.8M soldOpen-market trades
38 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Emily M. Leproust | Chief Executive Officer | $88.1M | — | 11 | 100% of sales | |
| Patrick John Finn | President and COO | $14.0M | — | 4 | 100% of sales | |
| Dennis Cho | Officer (see filing) | $5.9M | — | 5 | 100% of sales | |
| Paula Green | SVP of Human Resources | $4.2M | — | 2 | — | |
| Robert Chess | Director | $2.5M | — | 2 | 100% of sales | |
| Adam Laponis | Chief Financial Officer | $1.2M | — | 5 | 100% of sales | |
| Jan Johannessen | Director | $847.9K | — | 2 | — | |
| Robert F. Werner | Chief Accounting Officer | $679.6K | — | 3 | — | |
| Melissa A. Starovasnik | Director | $282.4K | — | 4 | 100% of sales |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 4,548 | $202.15 | $919.4K | 562,951 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 655 | $200.00 | $131.0K | 613,044 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 5,203 | $177.38 | $922.9K | 614,835 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 356,546 | $157.99 | $56.3M | 964,652 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 41,570 | $151.98 | $6.3M | 787,415 | |
traded | Dennis Cho Officer (see filing) | SalePre-arranged (10b5-1) | 14,205 | $129.75 | $1.8M | 75,661 | |
traded | Patrick John Finn President and COO | SalePre-arranged (10b5-1) | 78,355 | $117.64 | $9.2M | 249,259 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 19,952 | $125.08 | $2.5M | 818,938 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 113,318 | $125.16 | $14.2M | 818,938 | |
traded | Robert Chess Director | SalePre-arranged (10b5-1) | 18,417 | $110.89 | $2.0M | 21,084 | |
traded | Dennis Cho Officer (see filing) | SalePre-arranged (10b5-1) | 14,205 | $109.75 | $1.6M | 89,866 | |
traded | Dennis Cho Officer (see filing) | SalePre-arranged (10b5-1) | 14,205 | $89.75 | $1.3M | 105,141 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 18,880 | $95.00 | $1.8M | 824,039 | |
traded | Paula Green SVP of Human Resources | Sale | 26,137 | $81.67 | $2.1M | 120,705 | |
traded | Robert F. Werner Chief Accounting Officer | Sale | 1,127 | $69.07 | $77.8K | 46,827 | |
traded | Adam Laponis Chief Financial Officer | SalePre-arranged (10b5-1) | 4,000 | $70.00 | $280.0K | 112,675 | |
traded | Dennis Cho Officer (see filing) | SalePre-arranged (10b5-1) | 14,205 | $69.75 | $990.8K | 120,094 | |
traded | Melissa A. Starovasnik Director | SalePre-arranged (10b5-1) | 2,500 | $68.00 | $170.0K | 22,222 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 16,470 | $67.91 | $1.1M | 853,337 | |
traded | Melissa A. Starovasnik Director | SalePre-arranged (10b5-1) | 500 | $61.04 | $30.5K | 24,722 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 49,299 | $65.19 | $3.2M | 846,872 | |
traded | Jan Johannessen Director | Sale | 12,000 | $56.12 | $673.4K | 17,754 | |
traded | Robert F. Werner Chief Accounting Officer | Sale | 4,961 | $56.88 | $282.2K | 49,674 | |
traded | Melissa A. Starovasnik Director | SalePre-arranged (10b5-1) | 500 | $61.83 | $30.9K | 25,222 | |
traded | Emily M. Leproust Chief Executive Officer | SalePre-arranged (10b5-1) | 9,671 | $65.24 | $631.0K | 859,038 | |
traded | Adam Laponis Chief Financial Officer | SalePre-arranged (10b5-1) | 4,000 | $60.00 | $240.0K | 118,694 | |
traded | Adam Laponis Chief Financial Officer | SalePre-arranged (10b5-1) | 3,000 | $55.00 | $165.0K | 122,694 | |
traded | Melissa A. Starovasnik Director | SalePre-arranged (10b5-1) | 1,000 | $51.00 | $51.0K | 25,722 | |
traded | Robert Chess Director | SalePre-arranged (10b5-1) | 10,000 | $47.00 | $470.0K | 21,084 | |
traded | Patrick John Finn President and COO | SalePre-arranged (10b5-1) | 68,967 | $51.65 | $3.6M | 287,788 | |
traded | Paula Green SVP of Human Resources | Sale | 39,404 | $52.40 | $2.1M | 126,041 | |
traded | Patrick John Finn President and COO | SalePre-arranged (10b5-1) | 5,250 | $50.16 | $263.4K | 306,250 | |
traded | Dennis Cho Officer (see filing) | SalePre-arranged (10b5-1) | 5,000 | $49.93 | $249.7K | 138,581 | |
traded | Adam Laponis Chief Financial Officer | SalePre-arranged (10b5-1) | 7,000 | $50.00 | $350.0K | 130,031 | |
traded | Robert F. Werner Chief Accounting Officer | Sale | 7,000 | $45.65 | $319.5K | 58,738 | |
traded | Patrick John Finn President and COO | SalePre-arranged (10b5-1) | 23,279 | $40.00 | $931.2K | 312,883 | |
traded | Adam Laponis Chief Financial Officer | SalePre-arranged (10b5-1) | 3,000 | $40.00 | $120.0K | 137,031 | |
traded | Jan Johannessen Director | Sale | 7,044 | $24.77 | $174.5K | 14,859 |
GET /stocks/filings/vX/form-4?tickers=TWST&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"TWST"
],
"issuer_cik": "0001581280",
"owner_cik": "0001753655",
"accession_number": "0001214659-26-012647",
"form_type": "4",
"filing_date": "2026-10-07",
"period_of_report": "2026-10-05",
"issuer_name": "Twist Bioscience Corp",
"issuer_trading_symbol": "TWST",
"owner_name": "Leproust Emily M.",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Executive Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-05",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 146,
"transaction_price_per_share": 206.8449,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 562805,
"transaction_value": 30199.3554,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on June 15, 2026."
},
{
"id": "F8",
"description": "Represents the weighted average sales price per share. The shares sold at prices ranging from $206.38 to $207.33\nper share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer."
}
]
},
{
"tickers": [
"TWST"
],
"issuer_cik": "0001581280",
"owner_cik": "0001753655",
"accession_number": "0001214659-26-012647",
"form_type": "4",
"filing_date": "2026-10-07",
"period_of_report": "2026-10-05",
"issuer_name": "Twist Bioscience Corp",
"issuer_trading_symbol": "TWST",
"owner_name": "Leproust Emily M.",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Executive Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-05",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 45,
"transaction_price_per_share": 207.4556,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 562760,
"transaction_value": 9335.502,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on June 15, 2026."
},
{
"id": "F9",
"description": "Represents the weighted average sales price per share. The shares sold at prices ranging from $207.38 to $207.8 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 140 records
- Option exercises21 records
- Tax withholding (sold to cover)98 records
- Grants and awards19 records
- Gifts2 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has the Twist Bioscience Corporation's CEO sold stock?
Yes. Emily M. Leproust (CEO) sold 636,112 shares ($88.1M) between Apr 2026 and Oct 2026, all under a pre-arranged 10b5-1 plan.
How current is TWST’s insider data?
These are TWST Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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