Glaukos
GKOS on NYSE. Surgical & medical instruments & apparatus. Market value $9.7bn.
Price checks use the past 12 months to June 2026. Quality checks use five annual reports, the latest for the year to December 2025.
We can't read total debt from the filing, so debt is left out.
Should I look at this?
Not a fit for our list right now
Why it could be worth it
See Health care stocks that passed both tests
This is not advice. Check the numbers below.
For every $100 of what the whole company costs, it produced $-0.13 of spare cash in the past 12 months. A savings account pays about $4.
The filings do not give us enough to work this out.
The filings do not give us enough to work this out.
Quality score: 40 of 100. Price score: 0 of 100. Our list needs 70 on quality and 60 on price.
$161.59 a share, 121% above its 1-year low
Over the past year the price has ranged from $73.16 to $191.62.
Pays no dividend
Prices from Tuesday’s close (6 October).
Five years of cash, in billions
Spare cash swings from quarter to quarter here: a shortfall of $12 million in the past 12 months, a shortfall of $22 million in the year to December 2025.
| Revenue | |||||
| Revenue | $294m | $283m | $315m | $383m | $507m |
| Operating margin | |||||
| Operating margin | -11.2% | -29.1% | -40.9% | -31.9% | -39.3% |
| Debt to equity | |||||
| Debt to equity | n/a | n/a | n/a | n/a | n/a |
| Shares outstanding | |||||
| Shares outstanding | 0.05bn | 0.05bn | 0.06bn | 0.06bn | 0.06bn |
Health checks
- Free cash flow positive0 of 5 years
- Accounting looks honest (Beneish)Not enough data
- Financial strength (Piotroski)3 of 8 checks we could run
- Profit backed by cash (accruals)No
- DebtUnknown
- Revenue growth, five yearsStrong, 17.7% a year
- Buying back its own sharesNo, 24% more shares since 2021
The quarter to June 2026
How the business did, compared with the same quarter a year earlier.
- Sales: $186 million last quarter, up 50% on a year ago.
- A loss of $18 million, compared with a loss of $20 million a year ago.
- It loses 32 cents on each $1 of sales, compared with 22 cents a year earlier.
- Over the past 12 months it spent $12 million more cash than it brought in, compared with $27 million a year earlier.
- 3% more shares than a year ago. Each share owns a bit less of the company.
- Sales grew on a year ago in each of the last 4 quarters.
| Quarter to | Amount |
|---|---|
| September 2024 | $97m |
| December 2024 | $105m |
| March 2025 | $107m |
| June 2025 | $124m |
| September 2025 | $134m |
| December 2025 | $143m |
| March 2026 | $151m |
| June 2026 | $186m |
| Quarter to | Amount |
|---|---|
| September 2024 | -$21m |
| December 2024 | -$34m |
| March 2025 | -$18m |
| June 2025 | -$20m |
| September 2025 | -$16m |
| December 2025 | -$134m |
| March 2026 | -$20m |
| June 2026 | -$18m |
From the company's quarterly reports to the SEC.
Dates
- Next results (estimated)
- n/a
- Last annual report (10-K)
- 23 February 2026
- Next quarterly (estimated, 10-Q)
- 28 October 2026
Who owns it
2 long-term investors we follow own it, up from 1 last quarter. 366 funds in all.
- GAMCO InvestorsMario Gabelli
- Value
- $452,543
- Share of fund
- <0.1%
| Fund | Value | Share of that fund | Change |
|---|---|---|---|
| Polen CapitalDan Davidowitz | $673,364 | <0.1% | New |
| GAMCO InvestorsMario Gabelli | $452,543 | <0.1% |
Largest holders overall
- BlackRock$1.3bnAdded
- Jupiter Topco$680m
- Vanguard Portfolio Management$464mAdded
- Primecap Management$425mCut
- Vanguard Capital Management$357m
- State Street$324mAdded
- Millennium Management$221mAdded
- Holocene Advisors, LP$212mAdded
- Geode Capital Management$205mAdded
- Citadel Advisors$194mCut
From 13F filings for the quarter ended 30 June 2026.
Big holders and activists
7 investors own more than 5%.
- BlackRock, Inc.Passive investor14.4%Since 31 March 2025
- JANUS HENDERSON GROUP PLCPassive investor9.2%+3.9 ptsSince 31 March 2026
- PRIMECAP MANAGEMENT CO/CA/Passive investor5.9%Since 31 December 2025
- Vanguard Portfolio ManagementPassive investor5.6%Since 31 March 2026
- Wellington Management Company LLPPassive investor5.4%Since 30 June 2025
- Vanguard Capital ManagementPassive investor5.1%Since 31 March 2026
- FMR LLCPassive investorat least 4.5%−6.5 pts(filed with 1 related holder)Since 31 July 2025
- Thomas W. BurnsPassive investorSold down below 5%Since 31 December 2024
- Wellington Management Group LLPPassive investorSold down below 5%Since 31 December 2025
- The Vanguard GroupPassive investorSold down below 5%Since 13 March 2026
| Holder | Stake | Since | |
|---|---|---|---|
BlackRock, Inc. Passive investor | 14.4% | 31 March 2025 | |
JANUS HENDERSON GROUP PLC Passive investor | 9.2%+3.9 pts | 31 March 2026 | |
PRIMECAP MANAGEMENT CO/CA/ Passive investor | 5.9% | 31 December 2025 | |
Vanguard Portfolio Management Passive investor | 5.6% | 31 March 2026 | |
Wellington Management Company LLP Passive investor | 5.4% | 30 June 2025 | |
Vanguard Capital Management Passive investor | 5.1% | 31 March 2026 | |
FMR LLC Passive investor | at least 4.5%−6.5 pts (filed with 1 related holder) | 31 July 2025 | |
Thomas W. Burns Passive investor | Sold down below 5% | 31 December 2024 | |
Wellington Management Group LLP Passive investor | Sold down below 5% | 31 December 2025 | |
The Vanguard Group Passive investor | Sold down below 5% | 13 March 2026 |
From Schedule 13D and 13G filings: anyone owning more than 5% must file one.
What insiders did
No insider bought shares on the open market in the last 12 months. 8 sold $69m, $47m of it under preset trading plans.
- Navratil TomasCHIEF DEVELOPMENT OFFICERSoldunder a preset trading plan
- Date
- 25 September 2026
- Shares
- 1,615
- Price
- $154.28
- Value
- $249,158
- Navratil TomasCHIEF DEVELOPMENT OFFICERSoldunder a preset trading plan
- Date
- 16 September 2026
- Shares
- 1,457
- Price
- $166.92
- Value
- $243,204
- Navratil TomasCHIEF DEVELOPMENT OFFICERSold
- Date
- 28 August 2026
- Shares
- 13,744
- Price
- $180.67
- Value
- $2m
- Kliman Gilbert HDirectorSold
- Date
- 19 August 2026
- Shares
- 2,500
- Price
- $190.00
- Value
- $475,000
- Gilliam Joseph EPRESIDENT & COOSold
- Date
- 11 August 2026
- Shares
- 60,000
- Price
- $179.74
- Value
- $11m
- Thurman Alex R.SVP & CHIEF FINANCIAL OFFICERSoldunder a preset trading plan
- Date
- 7 August 2026
- Shares
- 20,000
- Price
- $180.13
- Value
- $4m
- WEN LEANADirectorSold
- Date
- 31 July 2026
- Shares
- 525
- Price
- $167.63
- Value
- $88,006
- Thurman Alex R.SVP & CHIEF FINANCIAL OFFICERSoldunder a preset trading plan
- Date
- 16 July 2026
- Shares
- 10,000
- Price
- $160.00
- Value
- $2m
- Thurman Alex R.SVP & CHIEF FINANCIAL OFFICERSoldunder a preset trading plan
- Date
- 9 July 2026
- Shares
- 10,000
- Price
- $155.00
- Value
- $2m
- Thurman Alex R.SVP & CHIEF FINANCIAL OFFICERSoldunder a preset trading plan
- Date
- 6 July 2026
- Shares
- 10,000
- Price
- $150.00
- Value
- $2m
| Date | Who | Did | Shares | Price | Value |
|---|---|---|---|---|---|
| 25 September 2026 | Navratil Tomas CHIEF DEVELOPMENT OFFICER | Sold under a preset trading plan | 1,615 | $154.28 | $249,158 |
| 16 September 2026 | Navratil Tomas CHIEF DEVELOPMENT OFFICER | Sold under a preset trading plan | 1,457 | $166.92 | $243,204 |
| 28 August 2026 | Navratil Tomas CHIEF DEVELOPMENT OFFICER | Sold | 13,744 | $180.67 | $2m |
| 19 August 2026 | Kliman Gilbert H Director | Sold | 2,500 | $190.00 | $475,000 |
| 11 August 2026 | Gilliam Joseph E PRESIDENT & COO | Sold | 60,000 | $179.74 | $11m |
| 7 August 2026 | Thurman Alex R. SVP & CHIEF FINANCIAL OFFICER | Sold under a preset trading plan | 20,000 | $180.13 | $4m |
| 31 July 2026 | WEN LEANA Director | Sold | 525 | $167.63 | $88,006 |
| 16 July 2026 | Thurman Alex R. SVP & CHIEF FINANCIAL OFFICER | Sold under a preset trading plan | 10,000 | $160.00 | $2m |
| 9 July 2026 | Thurman Alex R. SVP & CHIEF FINANCIAL OFFICER | Sold under a preset trading plan | 10,000 | $155.00 | $2m |
| 6 July 2026 | Thurman Alex R. SVP & CHIEF FINANCIAL OFFICER | Sold under a preset trading plan | 10,000 | $150.00 | $2m |
From Form 4 filings: insiders must report trades in their own company's shares within two days.
Warning signs in its filings
Problems the company itself reported to the SEC, in its own words.
None of the warning signs we check for were found.
We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.
We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 23 Feb 2026, plus the 10-Q filed 29 Jul 2026 and 6 later 8-Ks.
A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.
What could go wrong
Cheap for a reason is the question the numbers cannot answer.
Whether the price already reflects the risks is what the deep dive is for.
The deep dive
Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.
- What the business is worth, as a range, and the margin of safety at today’s price
- Prices to start buying, buy, and buy hard
- The three things that would make this a mistake
- Every number footnoted to the filing it came from
Your first deep dive is free.
Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.