Glaukos Corp (GKOS) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Oct 7, 2026.
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- Filings shown
- 12
- Open-market buys
- 0
- Open-market sells
- 26
Counts cover the 12 most recent Form 4 filings Tradune holds for GKOS (filed Jul 8 – Oct 7, 2026); the score below covers only the trailing 90 days (0 buys, 22 sells). No completed check of GKOS's Form 4 list on SEC EDGAR is on record yet; the latest GKOS filing Tradune holds was filed Oct 7, 2026. This is not guaranteed to be the complete record — see GKOS's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 8 filings Tradune holds for GKOS filed Aug 3 – Oct 7, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
22 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 15 sales· 24,599 sh
- checkbox disclosed
- On filings with the box not checked
- 7 sales· 76,769 sh
- not proof that no plan exists
- Not comparable
- 0 sales· 0 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Tomas NavratilCHIEF DEVELOPMENT OFFICER | 0 | 17 | — | 18,343 | −$3,226,587 |
| Joseph E. GilliamPRESIDENT & COO | 0 | 2 | — | 60,000 | −$10,784,659 |
| Alex R. ThurmanSVP & CHIEF FINANCIAL OFFICER | 0 | 1 | — | 20,000 | −$3,602,600 |
| Gilbert H. KlimanDirector | 0 | 1 | — | 2,500 | −$475,000 |
| Leana WenDirector | 0 | 1 | — | 525 | −$88,006 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at GKOS
No open-market insider purchases (Form 4 code P) were reported for GKOS between Jul 8, 2026 and Oct 7, 2026. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 312 | $165.60 | 69,291 | −0.4% | Oct 5, 2026 |
| Open-market sale 10b5-1 box checked | 327 | $164.78 | 69,603 | −0.5% | Oct 5, 2026 |
| Open-market sale 10b5-1 box checked | 888 | $163.93 | 69,930 | −1.3% | Oct 5, 2026 |
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 1,083 | $154.88 | 70,818 | −1.5% | Sep 25, 2026 |
| Open-market sale 10b5-1 box checked | 229 | $154.24 | 71,901 | −0.3% | Sep 25, 2026 |
| Open-market sale 10b5-1 box checked | 136 | $152.71 | 72,130 | −0.2% | Sep 25, 2026 |
| Open-market sale 10b5-1 box checked | 167 | $151.70 | 72,266 | −0.2% | Sep 25, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 103 | $163.20 | 73,787 | −0.1% | Sep 16, 2026 |
| Open-market sale 10b5-1 box checked | 345 | $164.60 | 73,442 | −0.5% | Sep 16, 2026 |
| Open-market sale 10b5-1 box checked | 191 | $166.20 | 73,251 | −0.3% | Sep 16, 2026 |
| Open-market sale 10b5-1 box checked | 460 | $167.32 | 72,791 | −0.6% | Sep 16, 2026 |
| Open-market sale 10b5-1 box checked | 120 | $168.38 | 72,671 | −0.2% | Sep 16, 2026 |
| Open-market sale 10b5-1 box checked | 234 | $170.95 | 72,437 | −0.3% | Sep 16, 2026 |
| Open-market sale 10b5-1 box checked | 4 | $172.00 | 72,433 | −0.0% | Sep 16, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 7,643 | $180.25 | 79,991 | −8.7% | Aug 28, 2026 |
| Open-market sale 10b5-1 box not checked | 6,091 | $181.19 | 73,900 | −7.6% | Aug 28, 2026 |
| Open-market sale 10b5-1 box not checked | 10 | $182.50 | 73,890 | −0.0% | Aug 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 2,500 | $25.77 | 39,906 | +6.7% | Aug 19, 2026 |
| Open-market sale 10b5-1 box not checked | 2,500 | $190.00 | 37,406 | −6.3% | Aug 19, 2026 |
| Option exercise Stock Option (Right to Buy) | 2,500 | — | — | — | Aug 19, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise Stock Option (Right to Buy) | 20,000 | — | — | — | Aug 11, 2026 |
| Option exercise Stock Option (Right to Buy) | 10,000 | — | — | — | Aug 11, 2026 |
| Option exercise Stock Option (Right to Buy) | 10,000 | — | — | — | Aug 11, 2026 |
| Option exercise | 20,000 | $55.18 | 102,588 | +24% | Aug 11, 2026 |
| Option exercise | 20,000 | $55.18 | 122,588 | +19% | Aug 11, 2026 |
| Option exercise | 10,000 | $48.46 | 132,588 | +8.2% | Aug 11, 2026 |
| Open-market sale 10b5-1 box not checked | 27,963 | $178.89 | 104,625 | −21% | Aug 11, 2026 |
| Open-market sale 10b5-1 box not checked | 32,037 | $180.49 | 72,588 | −31% | Aug 11, 2026 |
| Option exercise Stock Option (Right to Buy) | 20,000 | — | — | — | Aug 11, 2026 |
| Option exercise | 10,000 | $48.46 | 82,588 | +14% | Aug 11, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise Stock Option (Right to Buy) | 20,000 | — | — | — | Aug 7, 2026 |
| Open-market sale 10b5-1 box checked | 20,000 | $180.13 | 43,906 | −31% | Aug 7, 2026 |
| Option exercise | 20,000 | $33.81 | 63,906 | +46% | Aug 7, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 525 | $167.63 | 21,092 | −2.4% | Jul 31, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 10,000 | $38.68 | 53,906 | +23% | Jul 16, 2026 |
| Open-market sale 10b5-1 box checked | 10,000 | $160.00 | 43,906 | −19% | Jul 16, 2026 |
| Option exercise Stock Option (Right to Buy) | 10,000 | — | — | — | Jul 16, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 10,000 | $38.68 | 53,681 | +23% | Jul 9, 2026 |
| Open-market sale 10b5-1 box checked | 10,000 | $155.00 | 43,681 | −19% | Jul 9, 2026 |
| Option exercise Stock Option (Right to Buy) | 10,000 | — | — | — | Jul 9, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise Stock Option (Right to Buy) | 10,000 | $38.68 | — | — | Jul 6, 2026 |
| Open-market sale 10b5-1 box checked | 10,000 | $150.00 | 43,681 | −19% | Jul 6, 2026 |
| Option exercise | 10,000 | $38.68 | 53,681 | +23% | Jul 6, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box checked | 716 | $139.06 | 87,634 | −0.8% | Jul 1, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to GKOS's (Oct 7, 2026).
Frequently asked about GKOS insider activity
How many insiders bought GKOS stock in these Form 4 filings?
No open-market purchases (Form 4 code P) of GKOS shares were reported by Glaukos Corp insiders between Jul 8, 2026 and Oct 7, 2026. The 12 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for GKOS?
The most recent Form 4 on this page was filed by Tomas Navratil (CHIEF DEVELOPMENT OFFICER) on Oct 7, 2026, reporting 3 transactions. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market GKOS insider sale shown?
The largest open-market sale among the filings shown was 32,037 GKOS shares at $180.49 (about $5,782,358) by Joseph E. Gilliam (PRESIDENT & COO) on Aug 11, 2026. Value is shares × the price reported on the Form 4; its Rule 10b5-1 box is not checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track GKOS insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.