Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Twist Bioscience Corp

TWST · Nasdaq · CIK 0001581280 · Healthcare · Biotechnology

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

134 Form 4 transaction lines observed in the same window
120 sales · 14 option, withholding, award, gift or other lines

Last qualifying purchase2023-05-10 · Cho Dennis · $132.0K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Leproust Emily M.Chief Executive Officer
○▼○▼▼▼▼○▼▼▼▼▼▼
Cho DennisSee Remarks
▼▼▼▼▼▼▼
WERNER ROBERT F.Chief Accounting Officer
▼▼▼▼▼
Finn Patrick JohnPresident and COO
▼○▼▼▼
Green PaulaSVP of Human Resources
▼▼▼▼
Laponis AdamChief Financial Officer
▼▼▼▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 2 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2023-05-10 · Cho Dennis.

Recent Form 4 activity

0Purchases
186Sales
42Other Form 4 lines
150SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING120 sale line(s) · context only
OTHER14 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
10,567,132
Previous report
12,505,220
Avg daily volume
2,757,381
Days to cover
3.8

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2023-05-10Cho DennisPurchase (P)Common Stock10,000USD 13.20USD 132,000SEC filing ↗
2022-05-11BARTHELEMY NICOLASPurchase (P)Common Stock8,550USD 29.25USD 250,088SEC filing ↗

Form 4 evidence

228 transaction lines in the latest 365-day window; 1,646 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-09Laponis AdamSale (S)Common Stock2,462USD 156.30USD 384,823SEC filing ↗
2026-10-05Leproust Emily M.Sale (S)Common Stock4,548USD 202.15USD 919,374SEC filing ↗
2026-10-02WERNER ROBERT F.Sale (S)Common Stock1,482USD 188.88USD 279,926SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-09Laponis AdamSale (S)Common Stock2,462USD 156.30USD 384,823SEC filing ↗
2026-10-05Leproust Emily M.Sale (S)Common Stock4,548USD 202.15USD 919,374SEC filing ↗
2026-10-02WERNER ROBERT F.Sale (S)Common Stock1,482USD 188.88USD 279,926SEC filing ↗
2026-10-02Leproust Emily M.Sale (S)Common Stock45,736USD 188.88USD 8,638,799SEC filing ↗
2026-10-02Laponis AdamSale (S)Common Stock8,057USD 188.88USD 1,521,838SEC filing ↗
2026-10-02Green PaulaSale (S)Common Stock10,088USD 188.88USD 1,905,462SEC filing ↗
2026-10-02Finn Patrick JohnSale (S)Common Stock25,714USD 188.88USD 4,856,963SEC filing ↗
2026-10-02Cho DennisSale (S)Common Stock9,514USD 188.88USD 1,797,042SEC filing ↗
2026-10-01Leproust Emily M.Sale (S)Common Stock655USD 200.00USD 131,000SEC filing ↗
2026-09-24Leproust Emily M.Sale (S)Common Stock5,203USD 177.38USD 922,899SEC filing ↗
2026-09-21Leproust Emily M.Sale (S)Common Stock1,687USD 165.49USD 279,182SEC filing ↗
2026-09-21Green PaulaSale (S)Common Stock294USD 165.49USD 48,654SEC filing ↗
2026-09-21Cho DennisSale (S)Common Stock348USD 165.49USD 57,591SEC filing ↗
2026-09-17Leproust Emily M.Sale (S)Common Stock356,546USD 157.99USD 56,331,385SEC filing ↗
2026-09-17Leproust Emily M.Option exercise / conversion (M)Common Stock208,708USD 20.21USD 4,218,324SEC filing ↗
2026-09-08WERNER ROBERT F.Sale (S)Common Stock238USD 122.62USD 29,184SEC filing ↗
2026-09-08Leproust Emily M.Sale (S)Common Stock2,302USD 122.62USD 282,271SEC filing ↗
2026-09-08Green PaulaSale (S)Common Stock907USD 122.62USD 111,216SEC filing ↗
2026-09-08Cho DennisSale (S)Common Stock412USD 122.62USD 50,519SEC filing ↗
2026-08-25Leproust Emily M.Sale (S)Common Stock41,570USD 151.98USD 6,317,802SEC filing ↗
2026-08-24WERNER ROBERT F.Sale (S)Common Stock854USD 140.77USD 120,218SEC filing ↗
2026-08-21WERNER ROBERT F.Sale (S)Common Stock669USD 139.07USD 93,038SEC filing ↗
2026-08-21Leproust Emily M.Sale (S)Common Stock6,639USD 139.07USD 923,286SEC filing ↗
2026-08-21Laponis AdamSale (S)Common Stock1,965USD 139.07USD 273,273SEC filing ↗
2026-08-21Green PaulaSale (S)Common Stock1,360USD 139.07USD 189,135SEC filing ↗
2026-08-21Finn Patrick JohnSale (S)Common Stock4,046USD 139.07USD 562,677SEC filing ↗
2026-08-21Cho DennisSale (S)Common Stock1,598USD 139.07USD 222,234SEC filing ↗
2026-08-19Cho DennisSale (S)Common Stock14,205USD 129.75USD 1,843,099SEC filing ↗
2026-08-18Finn Patrick JohnSale (S)Common Stock78,355USD 117.64USD 9,217,707SEC filing ↗
2026-08-18Finn Patrick JohnOption exercise / conversion (M)Common Stock23,355USD 67.85USD 1,584,637SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerTWST
CIK0001581280
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2836 Biological Products, (No Diagnostic Substances)
ExchangeNasdaq

Data coverage

Local Form 4 history1,646 transaction lines from 2020-01-08 to 2026-10-09
2 P purchase lines · 932 S sale lines · 712 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.