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

Zai Lab Ltd

ZLAB · Nasdaq · CIK 0001704292 · Healthcare · Biotechnology

INSIDER SIGNAL

No active buy signal

1 qualifying P purchase group
in the current 180-day scoring window

44 Form 4 transaction lines observed in the same window
14 sales · 29 option, withholding, award, gift or other lines

Last qualifying purchase2026-07-01 · GAYNOR RICHARD · $33.1K

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying1 qualifying line group(s)
Recent salesModerate
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
Du YingChairperson & CEO
○○○○○▼○▼○○○○
Chen YajingChief Financial Officer
○▼▼○○▼○○
Lis WilliamDirector
○▼▼
GAYNOR RICHARDDirector
○●
Edmondson Frazor Titus IIIChief Legal Officer
○▼
WIRTH PETERDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 5 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: GAYNOR RICHARD · $33.1K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-07-01–2026-07-01

Roles in the peak window: Director. Concentration uses priced qualifying P lines only and does not change the saved score.

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: 2026-07-01 · GAYNOR RICHARD.

Recent Form 4 activity

2Purchases
40Sales
58Other Form 4 lines
50SEC filings · 365 days
BUYING1 qualifying P line(s) · 180 days
SELLING14 sale line(s) · context only
OTHER29 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
7,149,727
Previous report
8,156,879
Avg daily volume
791,166
Days to cover
9.0

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
2026-07-01GAYNOR RICHARDPurchase (P)American Depositary Shares1,736USD 19.05USD 33,071SEC filing ↗
2026-03-17GAYNOR RICHARDPurchase (P)American Depositary Shares1,731USD 18.91USD 32,733SEC filing ↗
2025-09-10Smiley Joshua LPurchase (P)American Depositary Shares10,000USD 28.91USD 289,100SEC filing ↗
2024-05-13Smiley Joshua LPurchase (P)American Depositary Shares3,000USD 21.40USD 64,200SEC filing ↗
2024-03-01Smiley Joshua LPurchase (P)American Depositary Shares3,000USD 20.83USD 62,490SEC filing ↗
2023-12-14Smiley Joshua LPurchase (P)American Depositary Shares4,000USD 29.90USD 119,600SEC filing ↗
2023-11-16Smiley Joshua LPurchase (P)American Depositary Shares5,000USD 26.93USD 134,650SEC filing ↗
2021-12-08WIRTH PETERPurchase (P)American Depositary Shares4,000USD 71.36USD 285,440SEC filing ↗
2021-12-08WIRTH PETERPurchase (P)Ordinary Shares4,000USD 71.36USD 285,440SEC filing ↗

Form 4 evidence

100 transaction lines in the latest 365-day window; 587 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-01Chen YajingOption exercise / conversion (M)American Depositary Shares920USD —USD —SEC filing ↗
2026-10-01Chen YajingTax withholding (F)American Depositary Shares315USD 25.50USD 8,032SEC filing ↗
2026-08-19Chen YajingSale (S)American Depositary Shares260USD 27.00USD 7,020SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-01Chen YajingOption exercise / conversion (M)American Depositary Shares920USD —USD —SEC filing ↗
2026-10-01Chen YajingTax withholding (F)American Depositary Shares315USD 25.50USD 8,032SEC filing ↗
2026-08-19Chen YajingSale (S)American Depositary Shares260USD 27.00USD 7,020SEC filing ↗
2026-08-14Chen YajingOption exercise / conversion (M)American Depositary Shares1,250USD —USD —SEC filing ↗
2026-08-14Chen YajingTax withholding (F)American Depositary Shares427USD 25.90USD 11,059SEC filing ↗
2026-08-12Lis WilliamSale (S)American Depositary Shares8,506USD 25.00USD 212,650SEC filing ↗
2026-08-11Chen YajingSale (S)American Depositary Shares619USD 25.00USD 15,475SEC filing ↗
2026-07-02Du YingOption exercise / conversion (M)American Depositary Shares11,048USD —USD —SEC filing ↗
2026-07-02Du YingTax withholding (F)American Depositary Shares4,348USD 19.12USD 83,134SEC filing ↗
2026-07-01GAYNOR RICHARDPurchase (P)American Depositary Shares1,736USD 19.05USD 33,071SEC filing ↗
2026-07-01Du YingOption exercise / conversion (M)American Depositary Shares18,000USD —USD —SEC filing ↗
2026-07-01Du YingTax withholding (F)American Depositary Shares7,083USD 19.15USD 135,639SEC filing ↗
2026-06-30Du YingSale (S)American Depositary Shares7,026USD 18.53USD 130,192SEC filing ↗
2026-06-29Du YingOption exercise / conversion (M)American Depositary Shares17,970USD —USD —SEC filing ↗
2026-06-26Edmondson Frazor Titus IIISale (S)American Depositary Shares4,103USD 17.46USD 71,638SEC filing ↗
2026-06-26Du YingSale (S)American Depositary Shares24,543USD 17.46USD 428,521SEC filing ↗
2026-06-26Chen YajingSale (S)American Depositary Shares2,264USD 17.46USD 39,529SEC filing ↗
2026-06-25Edmondson Frazor Titus IIIOption exercise / conversion (M)American Depositary Shares14,600USD —USD —SEC filing ↗
2026-06-25Du YingOption exercise / conversion (M)American Depositary Shares58,800USD —USD —SEC filing ↗
2026-06-25Chen YajingOption exercise / conversion (M)American Depositary Shares6,250USD —USD —SEC filing ↗
2026-06-22Lis WilliamSale (S)American Depositary Shares7,040USD 18.09USD 127,354SEC filing ↗
2026-06-17WIRTH PETERAward / grant (A)American Depositary Shares22,371USD 0.00USD 0SEC filing ↗
2026-06-17Vounatsos MichelAward / grant (A)American Depositary Shares22,371USD 0.00USD 0SEC filing ↗
2026-06-17Morrison Scott WAward / grant (A)American Depositary Shares22,371USD 0.00USD 0SEC filing ↗
2026-06-17MOULDER LEON O JRAward / grant (A)American Depositary Shares22,371USD 0.00USD 0SEC filing ↗
2026-06-17Lis WilliamAward / grant (A)American Depositary Shares22,371USD 0.00USD 0SEC filing ↗
2026-06-17Leung NisaAward / grant (A)American Depositary Shares22,371USD 0.00USD 0SEC filing ↗
2026-06-17GAYNOR RICHARDAward / grant (A)American Depositary Shares22,371USD 0.00USD 0SEC filing ↗
2026-06-17DIEKMAN JOHN DAward / grant (A)American Depositary Shares22,371USD 0.00USD 0SEC filing ↗
2026-05-27Du YingGift (G)American Depositary Shares87,843USD 0.00USD 0SEC 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 · —
TickerZLAB
CIK0001704292
SectorHealthcare
IndustryBiotechnology Yahoo Finance
SEC SIC2834 Pharmaceutical Preparations
ExchangeNasdaq

Data coverage

Local Form 4 history587 transaction lines from 2021-01-05 to 2026-10-01
9 P purchase lines · 316 S sale lines · 262 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.