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

GLAUKOS Corp

GKOS · NYSE · CIK 0001192448 · Healthcare · Medical Devices

INSIDER SIGNAL

No active buy signal

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

53 Form 4 transaction lines observed in the same window
32 sales · 21 option, withholding, award, gift or other lines

Last qualifying purchaseNo qualifying purchase is present in the local Form 4 history.

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
Thurman Alex R.SVP & CHIEF FINANCIAL OFFICER
○▼○▼○▼○▼○▼
Navratil TomasCHIEF DEVELOPMENT OFFICER
▼○▼▼▼▼▼
Kliman Gilbert HDirector
○▼○▼○○▼
Gilliam Joseph EPRESIDENT & COO
▼○○▼
WEN LEANADirector
▼○▼
Hoffmeister David FDirector
○○
● Purchase▼ Sale○ Other

Showing the six most active owners; 5 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.—

Recent Form 4 activity

0Purchases
61Sales
78Other Form 4 lines
74SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING32 sale line(s) · context only
OTHER21 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
3,850,422
Previous report
4,166,410
Avg daily volume
944,395
Days to cover
4.1

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

No qualifying code P equity purchase is present in the local Form 4 history.

Form 4 evidence

139 transaction lines in the latest 365-day window; 691 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-05Navratil TomasSale (S)Common Stock1,527USD 164.45USD 251,120SEC filing ↗
2026-09-25Navratil TomasSale (S)Common Stock1,615USD 154.28USD 249,158SEC filing ↗
2026-09-16Navratil TomasSale (S)Common Stock1,457USD 166.92USD 243,204SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-05Navratil TomasSale (S)Common Stock1,527USD 164.45USD 251,120SEC filing ↗
2026-09-25Navratil TomasSale (S)Common Stock1,615USD 154.28USD 249,158SEC filing ↗
2026-09-16Navratil TomasSale (S)Common Stock1,457USD 166.92USD 243,204SEC filing ↗
2026-08-28Navratil TomasSale (S)Common Stock13,744USD 180.67USD 2,483,104SEC filing ↗
2026-08-19Kliman Gilbert HSale (S)Common Stock2,500USD 190.00USD 475,000SEC filing ↗
2026-08-19Kliman Gilbert HOption exercise / conversion (M)Common Stock2,500USD 25.77USD 64,425SEC filing ↗
2026-08-11Gilliam Joseph ESale (S)Common Stock60,000USD 179.74USD 10,784,659SEC filing ↗
2026-08-11Gilliam Joseph EOption exercise / conversion (M)Common Stock30,000USD 52.94USD 1,588,200SEC filing ↗
2026-08-07Thurman Alex R.Sale (S)Common Stock20,000USD 180.13USD 3,602,600SEC filing ↗
2026-08-07Thurman Alex R.Option exercise / conversion (M)Common Stock20,000USD 33.81USD 676,200SEC filing ↗
2026-07-31WEN LEANASale (S)Common Stock525USD 167.63USD 88,006SEC filing ↗
2026-07-16Thurman Alex R.Sale (S)Common Stock10,000USD 160.00USD 1,600,000SEC filing ↗
2026-07-16Thurman Alex R.Option exercise / conversion (M)Common Stock10,000USD 38.68USD 386,800SEC filing ↗
2026-07-09Thurman Alex R.Sale (S)Common Stock10,000USD 155.00USD 1,550,000SEC filing ↗
2026-07-09Thurman Alex R.Option exercise / conversion (M)Common Stock10,000USD 38.68USD 386,800SEC filing ↗
2026-07-06Thurman Alex R.Sale (S)Common Stock10,000USD 150.00USD 1,500,000SEC filing ↗
2026-07-06Thurman Alex R.Option exercise / conversion (M)Common Stock10,000USD 38.68USD 386,800SEC filing ↗
2026-07-01Navratil TomasSale (S)Common Stock716USD 139.06USD 99,567SEC filing ↗
2026-06-25Navratil TomasTax withholding (F)Common Stock483USD 142.57USD 68,861SEC filing ↗
2026-06-25Gilliam Joseph ETax withholding (F)Common Stock1,056USD 142.57USD 150,554SEC filing ↗
2026-06-25Burns Thomas WilliamTax withholding (F)Common Stock4,059USD 142.57USD 578,692SEC filing ↗
2026-06-16Navratil TomasSale (S)Common Stock1,537USD 130.68USD 200,855SEC filing ↗
2026-05-28WEN LEANAAward / grant (A)Common Stock1,878USD 0.00USD 0SEC filing ↗
2026-05-28WEISNER AIMEE SAward / grant (A)Common Stock1,878USD 0.00USD 0SEC filing ↗
2026-05-28Torres DeniceAward / grant (A)Common Stock1,878USD 0.00USD 0SEC filing ↗
2026-05-28Stapley MarcAward / grant (A)Common Stock1,878USD 0.00USD 0SEC filing ↗
2026-05-28Kliman Gilbert HAward / grant (A)Common Stock1,878USD 0.00USD 0SEC filing ↗
2026-05-28Hoffmeister David FAward / grant (A)Common Stock1,878USD 0.00USD 0SEC filing ↗
2026-05-28Foley Mark JAward / grant (A)Common Stock1,878USD 0.00USD 0SEC filing ↗
2026-05-26Hoffmeister David FOption exercise / conversion (M)Common Stock15,000USD 24.69USD 370,350SEC 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 · —
TickerGKOS
CIK0001192448
SectorHealthcare
IndustryMedical Devices Yahoo Finance
SEC SIC3841 Surgical & Medical Instruments & Apparatus
ExchangeNYSE

Data coverage

Local Form 4 history691 transaction lines from 2020-01-02 to 2026-10-05
0 P purchase lines · 227 S sale lines · 464 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.