Twist Bioscience TWST Insider Ownership

NASDAQ TWST

$159.78 +7.73 (+5.08%)

At close: Oct 9, 2026 · 4:00 PM EDT

Insider Holdings by Owner

1.77Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

2.25%

▼-0.508% pp QoQ

Shares Held by Insiders

1.41Mn

filed for Sep 2026

▼-18.39% QoQ

Shares Outstanding

62.67Mn

62,674,000 shares

Direct Holdings

1.34Mn

Indirect: 76.05K

Net Shares Traded (QoQ)

-318.08K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Over the past 12 months, Twist Bioscience insiders sold $148.75 million of stock on the open market (1.34Mn shares) and made no open-market purchases.

Counted by insider, open-market selling of TWST stock in the past 12 months came from 10 insiders, with no insider buying.
Emily M. Leproust (Chief Executive Officer) sold the most Twist Bioscience stock on the open market over the past 12 months, $101.68 million (772.71K shares), most recently on October 5, 2026.
In transactions other than open-market trades, Twist Bioscience insiders received 665.81K shares in stock awards, acquired 564.82K shares through option exercises and conversions and gave away 2.5K shares as gifts over the past 12 months.
Business Quant data shows Twist Bioscience insiders holding 1.31Mn shares in total in their latest Form 4 filings, or 2.08% of the 62.67Mn shares outstanding; that total is down 24.51% from 1.73Mn shares at the end of Q2 2026.
Of the 1.31Mn shares held by Twist Bioscience insiders, 1.23Mn shares (94.18%) are held directly and 76.05K shares (5.82%) indirectly, through trusts, partnerships, family members and other entities.
Holdings in Twist Bioscience stock are reported by 13 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
Twist Bioscience's top three insider holders by shares held are Emily M. Leproust (Chief Executive Officer, 562.76K shares), Patrick John Finn (President and COO, 185.09K shares) and Paula Green (SVP of Human Resources, 106.63K shares).
Emily M. Leproust alone accounts for 43.09% of the shares held by Twist Bioscience insiders.
In the last 12 months, 150 Form 4 filings with transactions in TWST stock came from 13 insiders.
This summary of Twist Bioscience insider activity covers Form 4 filings through October 7, 2026.

Form 4 Holdings

Insiders Holding TWST

Insiders 19

Shares held 1.77Mn

Of outstanding 2.83%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Emily M. Leproust	Chief Executive Officer	562,760	562,760	31.8%	07 Oct, 2026
2	William Banyai	See Remark	345,188	345,188	19.5%	07 May, 2024
3	Patrick John Finn	President And Coo	185,088	185,088	10.4%	05 Oct, 2026
4	Paula Green	Svp Of Human Resources	106,632	106,632	6.0%	05 Oct, 2026
5	Adam Laponis	Chief Financial Officer	100,576	100,576	5.7%	05 Oct, 2026
6	James M Thorburn	Chief Financial Officer	86,334	86,334	4.9%	04 Jan, 2024
7	Dennis Cho	Officer	63,789	63,789	3.6%	05 Oct, 2026
8	Patrick Weiss	Chief Operating Officer	47,401	47,401	2.7%	01 Apr, 2022
9	Robert F. Werner	Chief Accounting Officer	42,917	42,917	2.4%	05 Oct, 2026
10	Nelson Chan	Director	33,251	33,251	1.9%	09 Feb, 2026
11	Xiaoying Mai	Director	31,057	31,057	1.8%	09 Feb, 2024
12	Robert P Ragusa	Director	28,983	28,983	1.6%	09 Feb, 2026
13	Keith Crandell	Director	27,571	27,571	1.6%	09 Feb, 2026
14	Nicolas Barthelemy	Director	23,021	23,021	1.3%	23 Nov, 2022
15	Melissa A. Starovasnik	Director	22,222	22,222	1.3%	01 Jun, 2026
16	Robert Chess	Director	21,084	21,084	1.2%	11 Aug, 2026
17	Jan Johannessen	Director	17,754	17,754	1.0%	14 May, 2026
18	Katryn Blake	Director	17,208	17,208	1.0%	14 Aug, 2026
19	Kevin Bruce Yankton	Chief Accounting Officer	9,115	9,115	0.5%	19 May, 2023

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

2,118 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
05 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	1,840	$200.44	$368.81K	565,468	Direct
05 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	481	$201.26	$96.80K	564,987	Direct
05 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	1,017	$202.32	$205.76K	563,970	Direct
05 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	432	$203.61	$87.96K	563,538	Direct
05 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	290	$204.80	$59.39K	563,248	Direct
05 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	297	$205.78	$61.12K	562,951	Direct
05 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	146	$206.84	$30.20K	562,805	Direct
05 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	45	$207.46	$9.34K	562,760	Direct
02 Oct, 2026	Patrick John Finn	President And Coo	Disposed S	25,714	$188.88	$4.86Mn	185,088	Direct
02 Oct, 2026	Robert F. Werner	Chief Accounting Officer	Disposed S	1,482	$188.88	$279.93K	42,917	Direct
01 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	655	$200.00	$131.00K	613,044	Direct
02 Oct, 2026	Dennis Cho	Officer	Disposed S	9,514	$188.88	$1.80Mn	63,789	Direct
02 Oct, 2026	Paula Green	Svp Of Human Resources	Disposed S	10,088	$188.88	$1.91Mn	106,632	Direct
02 Oct, 2026	Adam Laponis	Chief Financial Officer	Disposed S	8,057	$188.88	$1.52Mn	100,576	Direct
02 Oct, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	45,736	$188.88	$8.64Mn	567,308	Direct
24 Sep, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	2,485	$175.23	$435.45K	616,417	Direct
24 Sep, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	945	$176.39	$166.69K	615,472	Direct
24 Sep, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	164	$177.17	$29.06K	615,308	Direct
24 Sep, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	330	$178.67	$58.96K	614,978	Direct
24 Sep, 2026	Emily M. Leproust	Chief Executive Officer	Disposed S	143	$179.93	$25.73K	614,835	Direct

Showing 1 to 20 of 2,118 transactions