TWST · Insider Trading

Twist Bioscience Corporation Common Stock

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Every open-market purchase and sale reported by TWST officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.

Form 4 Filings

most recent

Open-Market Buys

code P

Sales

code S

Reporting Insiders

current holders

TWST — Recent Form 4 Transactions (latest 2026-10-13)

Filed	Insider	Role	Type	Shares	Value
2026-10-13	Adam Laponis	Chief Financial Officer	Sell	−2,462	−$384.82K
2026-10-07	Emily M. Leproust	Chief Executive Officer	Sell	−4,548	−$919.37K
2026-10-05	Emily M. Leproust	Chief Executive Officer	Sell	−46,391	−$8.77M
2026-10-05	Dennis Cho	See Remarks	Sell	−9,514	−$1.80M
2026-10-05	Robert F. Werner	Chief Accounting Officer	Sell	−1,482	−$279.93K
2026-10-05	Adam Laponis	Chief Financial Officer	Sell	−8,057	−$1.52M
2026-10-05	Patrick John Finn	President and COO	Sell	−25,714	−$4.86M
2026-10-05	Paula Green	SVP of Human Resources	Sell	−10,088	−$1.91M
2026-09-25	Emily M. Leproust	Chief Executive Officer	Sell	−5,203	−$922.91K
2026-09-23	Paula Green	SVP of Human Resources	Sell	−294	−$48.65K
2026-09-23	Dennis Cho	See Remarks	Sell	−348	−$57.59K
2026-09-23	Emily M. Leproust	Chief Executive Officer	Sell	−1,687	−$279.18K
2026-09-21	Emily M. Leproust	Chief Executive Officer	MIXED	−147,838	−$52.11M
2026-09-10	Paula Green	SVP of Human Resources	Sell	−907	−$111.22K
2026-09-10	Dennis Cho	See Remarks	Sell	−412	−$50.52K
2026-09-10	Robert F. Werner	Chief Accounting Officer	Sell	−238	−$29.18K
2026-09-10	Emily M. Leproust	Chief Executive Officer	Sell	−2,302	−$282.28K
2026-08-27	Emily M. Leproust	Chief Executive Officer	Sell	−41,570	−$6.32M
2026-08-25	Adam Laponis	Chief Financial Officer	Sell	−1,965	−$273.26K
2026-08-25	Paula Green	SVP of Human Resources	Sell	−1,360	−$189.13K
2026-08-25	Patrick John Finn	President and COO	Sell	−4,046	−$562.66K
2026-08-25	Dennis Cho	See Remarks	Sell	−1,598	−$222.23K
2026-08-25	Robert F. Werner	Chief Accounting Officer	Sell	−1,523	−$213.26K
2026-08-25	Emily M. Leproust	Chief Executive Officer	Sell	−6,639	−$923.26K
2026-08-21	Dennis Cho	See Remarks	Sell	−14,205	−$1.84M
2026-08-20	Patrick John Finn	President and COO	MIXED	−55,000	−$7.63M
2026-08-14	Katryn Blake	Director	Sell	−2,240	−$275.25K
2026-08-14	Emily M. Leproust	Chief Executive Officer	MIXED	—	−$1.96M
2026-08-12	Emily M. Leproust	Chief Executive Officer	MIXED	—	−$11.16M
2026-08-11	Robert Chess	Director	MIXED	—	−$1.82M
2026-08-07	Dennis Cho	See Remarks	Sell	−14,205	−$1.56M
2026-08-07	Dennis Cho	See Remarks	Sell	−14,205	−$1.56M
2026-08-05	Paula Green	SVP of Human Resources	Sell	−1,133	−$96.67K
2026-08-05	Patrick John Finn	President and COO	Sell	−2,888	−$246.41K
2026-08-05	Emily M. Leproust	Chief Executive Officer	Sell	−5,101	−$435.22K
2026-08-05	Dennis Cho	See Remarks	Sell	−1,070	−$91.29K
2026-08-05	Robert F. Werner	Chief Accounting Officer	Sell	−167	−$14.25K
2026-07-27	Patrick John Finn	President and COO	Sell	−2,238	−$210.13K
2026-07-13	Adam Laponis	Chief Financial Officer	Sell	−2,399	−$226.31K
2026-06-26	Dennis Cho	See Remarks	Sell	−14,205	−$1.27M
2026-06-26	Emily M. Leproust	Chief Executive Officer	Sell	−18,880	−$1.79M
2026-06-24	Dennis Cho	See Remarks	Sell	−346	−$30.21K
2026-06-24	Paula Green	SVP of Human Resources	Sell	−291	−$25.41K
2026-06-24	Emily M. Leproust	Chief Executive Officer	Sell	−1,688	−$147.40K
2026-06-17	Paula Green	SVP of Human Resources	MIXED	—	−$1.52M
2026-06-10	Paula Green	SVP of Human Resources	Sell	−884	−$61.74K
2026-06-10	Dennis Cho	See Remarks	Sell	−402	−$28.08K
2026-06-10	Emily M. Leproust	Chief Executive Officer	Sell	−2,265	−$158.20K
2026-06-10	Robert F. Werner	Chief Accounting Officer	MIXED	−1,859	−$94.05K
2026-06-02	Dennis Cho	See Remarks	Sell	−14,205	−$990.80K

TWST — Current Insider Holders

Insider	Role	Shares Held	Value
Emily M. Leproust	Chief Executive Officer	596,549	$86.65M
Patrick John Finn	President and COO	185,088	$26.88M
Paula Green	SVP of Human Resources	106,632	$15.49M
Keith Crandell	Director	103,618	$15.05M
Adam Laponis	Chief Financial Officer	98,114	$14.25M
Robert Chess	Director	82,029	$11.91M
Dennis Cho	See Remarks	63,789	$9.27M
Robert F. Werner	Chief Accounting Officer	42,917	$6.23M
Nelson Chan	Director	33,251	$4.83M
Jan Johannessen	Director	29,754	$4.32M
Robert P Ragusa	Director	28,983	$4.21M
Melissa A. Starovasnik	Director	22,222	$3.23M
Katryn Blake	Director	17,208	$2.50M

TWST Insider Trading FAQ

Who are the insiders at TWST?

13 officers, directors and 10%+ beneficial owners currently report holdings in TWST via SEC Form 4.

Are TWST insiders buying or selling?

Across the 50 most recent Form 4 filings for TWST, 0 were open-market purchases (code P) and 43 were sales (code S). Sales frequently reflect scheduled 10b5-1 plans or tax withholding rather than a view on the stock.

How current is TWST insider data?

Form 4 must be filed within two business days of the transaction, so this is close to real time. The most recent TWST filing is dated 2026-10-13.

How to read Form 4 activity

Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.

Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.

Full filing history and per-insider positions are on the TWST quote page; the site-wide leaderboard is on the insider transactions hub.