GKOS SEC Filing News — Glaukos Corporation

Latest SEC filings for Glaukos Corporation (GKOS) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-07.

Glaukos Corporation, an ophthalmic pharmaceutical and medical technology company, develops therapies for the treatment of glaucoma, corneal disorders, and retinal diseases in the United States and internationally. It offers iStent and iStent inject W micro-bypass stents designed to treat mild-to-moderate open-angle glaucoma through the restoration of the natural physiologic outflow pathways for aqueous humor. The company also provides iStent infinite indicated for use in the treatment of patient…
Sector: Healthcare Industry: Medical Devices Market Cap: $9.7B CIK: 1192448
20
Total Filings
0
Bullish Classifications
10
Bearish Classifications
9
Insider Transactions
2
Material Events (8-K)
1
Periodic Reports
Rule-based classifications for GKOS currently lean bearish. Of the 20 filing records displayed, 10 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
GKOS Filing Activity Snapshot 2026-07-21 — 2026-10-07
Insider Transactions (Form 4)
0 buys vs 9 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$10.78M
Gilliam Joseph E (PRESIDENT & COO) · 2026-08-13
60,000 shares · Form 4
Form 144 Notices
8
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 9 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 9 filings in this group are Form 4s for Glaukos Corporation.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 9 insider filings shown, the breakdown is 9 open-market sale. 9 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×9
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Form 4 Open-market sale Insider Selling 2026-10-07

GKOS insider Navratil Tomas (CHIEF DEVELOPMENT OFFICER) sold 1,527 shares (~$251.1K)

Navratil Tomas, listed as CHIEF DEVELOPMENT OFFICER at GLAUKOS Corp, reported an open-market sale of 1,527 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 888 $163.93 $145.6K
S Open-market sale 327 $164.78 $53.9K
S Open-market sale 312 $165.60 $51.7K
Filing: Form 4 (Insider Transaction) Insider: Navratil Tomas (CHIEF DEVELOPMENT OFFICER) Shares: 1,527 Est. Value: $251.1K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-28

GKOS insider Navratil Tomas (CHIEF DEVELOPMENT OFFICER) sold 1,615 shares (~$249.2K)

Navratil Tomas, listed as CHIEF DEVELOPMENT OFFICER at GLAUKOS Corp, reported an open-market sale of 1,615 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 167 $151.70 $25.3K
S Open-market sale 136 $152.71 $20.8K
S Open-market sale 229 $154.24 $35.3K
S Open-market sale 1,083 $154.88 $167.7K
Filing: Form 4 (Insider Transaction) Insider: Navratil Tomas (CHIEF DEVELOPMENT OFFICER) Shares: 1,615 Est. Value: $249.2K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-18

GKOS insider Navratil Tomas (CHIEF DEVELOPMENT OFFICER) sold 1,457 shares (~$243.2K)

Navratil Tomas, listed as CHIEF DEVELOPMENT OFFICER at GLAUKOS Corp, reported an open-market sale of 1,457 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 103 $163.20 $16.8K
S Open-market sale 345 $164.60 $56.8K
S Open-market sale 191 $166.20 $31.7K
S Open-market sale 460 $167.32 $77.0K
S Open-market sale 120 $168.38 $20.2K
S Open-market sale 234 $170.95 $40.0K
S Open-market sale 4 $172.00 $688.00
Filing: Form 4 (Insider Transaction) Insider: Navratil Tomas (CHIEF DEVELOPMENT OFFICER) Shares: 1,457 Est. Value: $243.2K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-01

GKOS insider Navratil Tomas (CHIEF DEVELOPMENT OFFICER) sold 13,744 shares (~$2.48M)

Navratil Tomas, listed as CHIEF DEVELOPMENT OFFICER at GLAUKOS Corp, reported an open-market sale of 13,744 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 7,643 $180.25 $1.38M
S Open-market sale 6,091 $181.19 $1.10M
S Open-market sale 10 $182.50 $1.8K
Filing: Form 4 (Insider Transaction) Insider: Navratil Tomas (CHIEF DEVELOPMENT OFFICER) Shares: 13,744 Est. Value: $2.48M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-08-20

GKOS insider Kliman Gilbert H (Director) sold 2,500 shares (~$475.0K)

Kliman Gilbert H, listed as Director at GLAUKOS Corp, reported an open-market sale of 2,500 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 2,500 $25.77 $64.4K
S Open-market sale 2,500 $190.00 $475.0K
M Option exercise derivative · Stock Option (Right to Buy) 2,500 — —
Filing: Form 4 (Insider Transaction) Insider: Kliman Gilbert H (Director) Shares: 2,500 Est. Value: $475.0K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-08-13

GKOS insider Gilliam Joseph E (PRESIDENT & COO) sold 60,000 shares (~$10.78M)

Gilliam Joseph E, listed as PRESIDENT & COO at GLAUKOS Corp, reported an open-market sale of 60,000 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 10,000 $48.46 $484.6K
M Option exercise 20,000 $55.18 $1.10M
M Option exercise 20,000 $55.18 $1.10M
M Option exercise 10,000 $48.46 $484.6K
S Open-market sale 27,963 $178.89 $5.00M
S Open-market sale 32,037 $180.49 $5.78M
M Option exercise derivative · Stock Option (Right to Buy) 20,000 — —
M Option exercise derivative · Stock Option (Right to Buy) 20,000 — —
M Option exercise derivative · Stock Option (Right to Buy) 10,000 — —
M Option exercise derivative · Stock Option (Right to Buy) 10,000 — —
Filing: Form 4 (Insider Transaction) Insider: Gilliam Joseph E (PRESIDENT & COO) Shares: 60,000 Est. Value: $10.78M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-08-11

GKOS insider Thurman Alex R. (SVP & CHIEF FINANCIAL OFFICER) sold 20,000 shares (~$3.60M)

Thurman Alex R., listed as SVP & CHIEF FINANCIAL OFFICER at GLAUKOS Corp, reported an open-market sale of 20,000 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 20,000 $33.81 $676.2K
S Open-market sale 20,000 $180.13 $3.60M
M Option exercise derivative · Stock Option (Right to Buy) 20,000 — —
Filing: Form 4 (Insider Transaction) Insider: Thurman Alex R. (SVP & CHIEF FINANCIAL OFFICER) Shares: 20,000 Est. Value: $3.60M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-08-03

GKOS insider WEN LEANA (Director) sold 525 shares (~$88.0K)

WEN LEANA, listed as Director at GLAUKOS Corp, reported an open-market sale of 525 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 525 $167.63 $88.0K
Filing: Form 4 (Insider Transaction) Insider: WEN LEANA (Director) Shares: 525 Est. Value: $88.0K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-07-21

GKOS insider Thurman Alex R. (SVP & CHIEF FINANCIAL OFFICER) sold 10,000 shares (~$1.60M)

Thurman Alex R., listed as SVP & CHIEF FINANCIAL OFFICER at GLAUKOS Corp, reported an open-market sale of 10,000 GKOS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 10,000 $38.68 $386.8K
S Open-market sale 10,000 $160.00 $1.60M
M Option exercise derivative · Stock Option (Right to Buy) 10,000 — —
Filing: Form 4 (Insider Transaction) Insider: Thurman Alex R. (SVP & CHIEF FINANCIAL OFFICER) Shares: 10,000 Est. Value: $1.60M
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 8 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Glaukos Corporation has 8 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-10-05

GKOS Form 144 filed for proposed insider sale by Navratil Tomas (1,527 shares) ~$251.1K

Navratil Tomas filed a Form 144 with the SEC indicating intent to sell GKOS (GLAUKOS Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Navratil Tomas Shares: 1,527 Est. Value: $251.1K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-25

GKOS Form 144 filed for proposed insider sale by Navratil Tomas (1,615 shares) ~$249.2K

Navratil Tomas filed a Form 144 with the SEC indicating intent to sell GKOS (GLAUKOS Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Navratil Tomas Shares: 1,615 Est. Value: $249.2K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-16

GKOS Form 144 filed for proposed insider sale by Navratil Tomas (1,457 shares) ~$243.2K

Navratil Tomas filed a Form 144 with the SEC indicating intent to sell GKOS (GLAUKOS Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Navratil Tomas Shares: 1,457 Est. Value: $243.2K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-08-28

GKOS Form 144 filed for proposed insider sale by Navratil Tomas (13,744 shares) ~$2.48M

Navratil Tomas filed a Form 144 with the SEC indicating intent to sell GKOS (GLAUKOS Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Navratil Tomas Shares: 13,744 Est. Value: $2.48M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-08-19

GKOS Form 144 filed for proposed insider sale by Kliman Gilbert H (2,500 shares) ~$475.0K

Kliman Gilbert H filed a Form 144 with the SEC indicating intent to sell GKOS (GLAUKOS Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Kliman Gilbert H Shares: 2,500 Est. Value: $475.0K
View on SEC EDGAR → Open Filing Document →
Form 144 Large Proposed Insider Sale 2026-08-11

GKOS Form 144 filed for proposed insider sale by Gilliam Joseph E (60,000 shares) ~$10.78M

Gilliam Joseph E filed a Form 144 with the SEC indicating intent to sell GKOS (GLAUKOS Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: Gilliam Joseph E Shares: 60,000 Est. Value: $10.78M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-08-07

GKOS Form 144 filed for proposed insider sale by Thurman Alex R. (20,000 shares) ~$3.60M

Thurman Alex R. filed a Form 144 with the SEC indicating intent to sell GKOS (GLAUKOS Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Thurman Alex R. Shares: 20,000 Est. Value: $3.60M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-07-31

GKOS Form 144 filed for proposed insider sale by WEN LEANA (525 shares) ~$88.0K

WEN LEANA filed a Form 144 with the SEC indicating intent to sell GKOS (GLAUKOS Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: WEN LEANA Shares: 525 Est. Value: $88.0K
View on SEC EDGAR → Open Filing Document →
Material Events 2 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 2 in this period for Glaukos Corporation. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-03

GKOS filed 8-K — material company event

GLAUKOS Corp filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-07-29

GKOS filed 8-K — material company event

GLAUKOS Corp filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for Glaukos Corporation.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-07-29

GKOS filed Quarterly Report (10-Q)

GLAUKOS Corp filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →

How we classify Glaukos Corporation's filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on GKOS. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — GKOS SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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