Glaukos (GKOS)
Glaukos on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on NYSE, classified by the SEC as surgical & medical instruments & apparatus.
4.3M
Short interest
settlement 2026-10-15
4.0
Days to cover
unchanged vs prior
44.3%
Short share of volume
2026-11-02
1,067
Fails to deliver
settlement 2026-10-14
Tue 16 Feb
Next earnings
estimated date
-$18.1M
Insider flow, 90 days
0 buys, 21 sells
As of 2026-11-02.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 15 October 2026, short interest in GKOS is 4,343,054 shares, up 176,644 shares over the last month. Over the last 48 readings it ranged from 2,021,374 shares (31 December 2025) to 4,974,048 shares (30 June 2025). At the reported average volume of 1.1M shares a day that is 4.0 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-10-15 | 4,343,054 | +12.8% | 1,075,529 | 4.04 |
| 2026-09-30 | 3,850,422 | -7.6% | 944,395 | 4.08 |
| 2026-09-15 | 4,166,410 | +9.0% | 729,513 | 5.71 |
| 2026-08-31 | 3,821,554 | -3.3% | 574,294 | 6.65 |
| 2026-08-14 | 3,951,091 | +8.9% | 758,730 | 5.21 |
| 2026-07-31 | 3,626,381 | -22.9% | 995,081 | 3.64 |
| 2026-07-15 | 4,703,342 | +5.7% | 747,421 | 6.29 |
| 2026-06-30 | 4,449,767 | +6.6% | 997,150 | 4.46 |
| 2026-06-15 | 4,175,926 | +33.9% | 1,195,322 | 3.49 |
| 2026-05-29 | 3,118,577 | -5.7% | 1,524,894 | 2.05 |
| 2026-05-15 | 3,305,566 | +13.8% | 775,286 | 4.26 |
| 2026-04-30 | 2,905,337 | -10.1% | 803,838 | 3.61 |
| 2026-04-15 | 3,233,264 | +4.3% | 661,623 | 4.89 |
| 2026-03-31 | 3,099,829 | +15.9% | 743,529 | 4.17 |
| 2026-03-13 | 2,673,825 | -7.0% | 697,178 | 3.84 |
| 2026-02-27 | 2,873,448 | +6.5% | 910,460 | 3.16 |
| 2026-02-13 | 2,699,390 | +8.7% | 664,950 | 4.06 |
| 2026-01-30 | 2,483,025 | +11.6% | 1,008,213 | 2.46 |
| 2026-01-15 | 2,225,683 | +10.1% | 787,771 | 2.83 |
| 2025-12-31 | 2,021,374 | -1.3% | 581,517 | 3.48 |
| 2025-12-15 | 2,047,441 | -9.0% | 754,017 | 2.72 |
| 2025-11-28 | 2,250,099 | -16.2% | 1,029,387 | 2.19 |
| 2025-11-14 | 2,686,235 | -8.9% | 1,250,844 | 2.15 |
| 2025-10-31 | 2,947,690 | +22.4% | 2,056,466 | 1.43 |
| 2025-10-15 | 2,407,704 | -23.6% | 725,920 | 3.32 |
| 2025-09-30 | 3,153,613 | -2.4% | 874,674 | 3.61 |
| 2025-09-15 | 3,232,646 | -4.5% | 813,242 | 3.98 |
| 2025-08-29 | 3,386,049 | -5.6% | 579,217 | 5.85 |
| 2025-08-15 | 3,585,417 | -6.1% | 1,056,441 | 3.39 |
| 2025-07-31 | 3,818,289 | -21.3% | 1,394,974 | 2.74 |
| 2025-07-15 | 4,852,561 | -2.4% | 702,577 | 6.91 |
| 2025-06-30 | 4,974,048 | +24.9% | 1,003,282 | 4.96 |
| 2025-06-13 | 3,981,457 | +3.4% | 859,636 | 4.63 |
| 2025-05-30 | 3,850,044 | +14.8% | 912,858 | 4.22 |
| 2025-05-15 | 3,353,674 | -0.3% | 1,247,435 | 2.69 |
| 2025-04-30 | 3,365,514 | +6.2% | 904,262 | 3.72 |
| 2025-04-15 | 3,168,028 | -8.5% | 1,198,071 | 2.64 |
| 2025-03-31 | 3,461,461 | -6.8% | 744,441 | 4.65 |
| 2025-03-14 | 3,715,518 | +5.1% | 1,340,260 | 2.77 |
| 2025-02-28 | 3,535,415 | +1.5% | 1,406,354 | 2.51 |
| 2025-02-14 | 3,483,366 | +3.8% | 509,132 | 6.84 |
| 2025-01-31 | 3,357,415 | +4.0% | 438,290 | 7.66 |
| 2025-01-15 | 3,226,602 | +6.2% | 669,654 | 4.82 |
| 2024-12-31 | 3,037,964 | +18.2% | 688,515 | 4.41 |
| 2024-12-13 | 2,569,804 | -3.5% | 554,659 | 4.63 |
| 2024-11-29 | 2,663,704 | -5.2% | 415,199 | 6.42 |
| 2024-11-15 | 2,810,454 | +6.5% | 711,779 | 3.95 |
| 2024-10-31 | 2,638,586 | +10.9% | 455,294 | 5.80 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 2 November 2026, the short share of GKOS volume is 44.3%, down 33.4 points over the last five sessions. Over the last 30 readings it ranged from 32.2% (29 October 2026) to 82.8% (8 October 2026). The latest reading is 21.8 points below the 30-session average of 66.1%, on 532K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-11-02 | 236K | 532K | 44.3% | 1 |
| 2026-10-30 | 441K | 983K | 44.8% | 7,214 |
| 2026-10-29 | 817K | 2.5M | 32.2% | 12,536 |
| 2026-10-28 | 406K | 660K | 61.5% | 20 |
| 2026-10-27 | 441K | 650K | 67.9% | 2,146 |
| 2026-10-26 | 291K | 375K | 77.7% | 0 |
| 2026-10-23 | 199K | 259K | 76.8% | 0 |
| 2026-10-22 | 220K | 306K | 71.9% | 85 |
| 2026-10-21 | 217K | 335K | 64.6% | 0 |
| 2026-10-20 | 163K | 222K | 73.3% | 0 |
| 2026-10-19 | 187K | 232K | 80.7% | 0 |
| 2026-10-16 | 271K | 350K | 77.5% | 126 |
| 2026-10-15 | 178K | 270K | 66.0% | 0 |
| 2026-10-14 | 155K | 218K | 71.2% | 0 |
| 2026-10-13 | 182K | 273K | 66.4% | 2 |
| 2026-10-12 | 172K | 276K | 62.2% | 0 |
| 2026-10-09 | 334K | 430K | 77.7% | 2,315 |
| 2026-10-08 | 1.0M | 1.3M | 82.8% | 12,792 |
| 2026-10-07 | 446K | 659K | 67.7% | 765 |
| 2026-10-06 | 177K | 229K | 77.0% | 0 |
| 2026-10-05 | 239K | 332K | 72.0% | 0 |
| 2026-10-02 | 151K | 252K | 59.8% | 0 |
| 2026-10-01 | 187K | 270K | 69.2% | 0 |
| 2026-09-30 | 181K | 240K | 75.1% | 0 |
| 2026-09-29 | 150K | 209K | 72.0% | 0 |
| 2026-09-28 | 285K | 384K | 74.2% | 10 |
| 2026-09-25 | 158K | 253K | 62.5% | 100 |
| 2026-09-24 | 123K | 281K | 43.7% | 0 |
| 2026-09-23 | 201K | 362K | 55.5% | 0 |
| 2026-09-22 | 254K | 460K | 55.3% | 810 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 14 October 2026, the fails-to-deliver balance in GKOS is 1,067 shares, up 1,000 shares over the last settlement date. Over the last 30 readings it ranged from 2 shares (8 October 2026) to 10,484 shares (22 May 2026).
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-10-14 | 1,067 | $165.50 | $177K |
| 2026-10-13 | 67 | $168.02 | $11K |
| 2026-10-09 | 27 | $161.29 | $4K |
| 2026-10-08 | 2 | $172.18 | $344 |
| 2026-09-04 | 18 | $180.35 | $3K |
| 2026-09-03 | 1,782 | $179.53 | $320K |
| 2026-08-31 | 1,400 | $179.87 | $252K |
| 2026-08-28 | 3 | $181.91 | $546 |
| 2026-08-25 | 482 | $185.65 | $89K |
| 2026-08-24 | 1,884 | $184.89 | $348K |
| 2026-08-21 | 979 | $184.89 | $181K |
| 2026-08-20 | 857 | $189.55 | $162K |
| 2026-07-24 | 100 | $152.13 | $15K |
| 2026-07-23 | 100 | $152.86 | $15K |
| 2026-07-22 | 100 | $153.09 | $15K |
| 2026-07-20 | 5,617 | $156.83 | $881K |
| 2026-07-17 | 21 | $155.39 | $3K |
| 2026-07-10 | 44 | $155.07 | $7K |
| 2026-07-01 | 104 | $139.76 | $15K |
| 2026-06-25 | 847 | $137.76 | $117K |
| 2026-06-24 | 37 | $134.65 | $5K |
| 2026-06-22 | 693 | $130.68 | $91K |
| 2026-06-11 | 39 | $122.49 | $5K |
| 2026-06-09 | 203 | $121.96 | $25K |
| 2026-06-08 | 856 | $125.00 | $107K |
| 2026-06-05 | 96 | $121.69 | $12K |
| 2026-06-02 | 2,756 | $103.12 | $284K |
| 2026-06-01 | 398 | $103.35 | $41K |
| 2026-05-26 | 791 | $120.23 | $95K |
| 2026-05-22 | 10,484 | $139.03 | $1.5M |
Insider trades
SEC Form 4, newest first. JSONInsiders at GKOS reported 21 open-market sells worth $18.1M in the last 90 days and no open-market buys. Latest filing: Navratil Tomas (CHIEF DEVELOPMENT OFFICER) on 2026-10-05.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-05 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 312 | $165.60 | $52K | 69K |
| 2026-10-05 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 327 | $164.78 | $54K | 70K |
| 2026-10-05 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 888 | $163.93 | $146K | 70K |
| 2026-09-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 1K | $154.88 | $168K | 71K |
| 2026-09-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 229 | $154.24 | $35K | 72K |
| 2026-09-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 136 | $152.71 | $21K | 72K |
| 2026-09-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 167 | $151.70 | $25K | 72K |
| 2026-09-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 4 | $172.00 | $688 | 72K |
| 2026-09-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 234 | $170.95 | $40K | 72K |
| 2026-09-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 120 | $168.38 | $20K | 73K |
| 2026-09-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 460 | $167.32 | $77K | 73K |
| 2026-09-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 191 | $166.20 | $32K | 73K |
| 2026-09-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 345 | $164.60 | $57K | 73K |
| 2026-09-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 103 | $163.20 | $17K | 74K |
| 2026-08-28 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 10 | $182.50 | $2K | 74K |
| 2026-08-28 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 6K | $181.19 | $1.1M | 74K |
| 2026-08-28 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 8K | $180.25 | $1.4M | 80K |
| 2026-08-19 | Kliman Gilbert H | Director | Sell | 3K | $190.00 | $475K | 37K |
| 2026-08-19 | Kliman Gilbert H | Director | Exercise or conversion | 3K | $25.77 | $64K | 40K |
| 2026-08-11 | Gilliam Joseph E | PRESIDENT & COO | Exercise or conversion | 10K | $48.46 | $485K | 133K |
| 2026-08-11 | Gilliam Joseph E | PRESIDENT & COO | Exercise or conversion | 20K | $55.18 | $1.1M | 123K |
| 2026-08-11 | Gilliam Joseph E | PRESIDENT & COO | Sell | 32K | $180.49 | $5.8M | 73K |
| 2026-08-11 | Gilliam Joseph E | PRESIDENT & COO | Sell | 28K | $178.89 | $5.0M | 105K |
| 2026-08-11 | Gilliam Joseph E | PRESIDENT & COO | Exercise or conversion | 20K | $55.18 | $1.1M | 103K |
| 2026-08-11 | Gilliam Joseph E | PRESIDENT & COO | Exercise or conversion | 10K | $48.46 | $485K | 83K |
| 2026-08-07 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 20K | $180.13 | $3.6M | 44K |
| 2026-08-07 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Exercise or conversion | 20K | $33.81 | $676K | 64K |
| 2026-07-31 | WEN LEANA | Director | Sell | 525 | $167.63 | $88K | 21K |
| 2026-07-16 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 10K | $160.00 | $1.6M | 44K |
| 2026-07-16 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Exercise or conversion | 10K | $38.68 | $387K | 54K |
| 2026-07-09 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 10K | $155.00 | $1.6M | 44K |
| 2026-07-09 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Exercise or conversion | 10K | $38.68 | $387K | 54K |
| 2026-07-06 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 10K | $150.00 | $1.5M | 44K |
| 2026-07-06 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Exercise or conversion | 10K | $38.68 | $387K | 54K |
| 2026-07-01 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 716 | $139.06 | $100K | 88K |
| 2026-06-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 483 | $142.57 | $69K | 88K |
| 2026-06-25 | Gilliam Joseph E | PRESIDENT & COO | Tax withholding | 1K | $142.57 | $151K | 72K |
| 2026-06-25 | Burns Thomas William | CHAIRMAN & CEO | Tax withholding | 4K | $142.57 | $579K | 69K |
| 2026-06-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 2K | $130.68 | $201K | 89K |
| 2026-05-28 | WEN LEANA | Director | Grant | 2K | $0.00 | $0 | 22K |
| 2026-05-28 | Torres Denice | Director | Grant | 2K | $0.00 | $0 | 24K |
| 2026-05-28 | Stapley Marc | Director | Grant | 2K | $0.00 | $0 | 39K |
| 2026-05-28 | Hoffmeister David F | Director | Grant | 2K | $0.00 | $0 | 50K |
| 2026-05-28 | Kliman Gilbert H | Director | Grant | 2K | $0.00 | $0 | 37K |
| 2026-05-28 | WEISNER AIMEE S | Director | Grant | 2K | $0.00 | $0 | 21K |
| 2026-05-28 | Foley Mark J | Director | Grant | 2K | $0.00 | $0 | 60K |
| 2026-05-26 | Hoffmeister David F | Director | Exercise or conversion | 15K | $24.69 | $370K | 48K |
| 2026-05-14 | Kliman Gilbert H | Director | Sell | 5K | $140.76 | $704K | 36K |
| 2026-05-14 | Kliman Gilbert H | Director | Exercise or conversion | 5K | $24.69 | $123K | 41K |
| 2026-05-11 | Kliman Gilbert H | Director | Sell | 5K | $135.00 | $675K | 36K |
| 2026-05-11 | Kliman Gilbert H | Director | Exercise or conversion | 5K | $24.69 | $123K | 41K |
| 2026-05-01 | WEN LEANA | Director | Sell | 2K | $143.35 | $244K | 20K |
| 2026-05-01 | Gilliam Joseph E | PRESIDENT & COO | Sell | 20K | $143.54 | $2.8M | 73K |
| 2026-04-30 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 10K | $140.00 | $1.4M | 44K |
| 2026-04-30 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Exercise or conversion | 10K | $38.68 | $387K | 54K |
| 2026-04-10 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 32 | $120.23 | $4K | 90K |
| 2026-04-10 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 614 | $119.35 | $73K | 90K |
| 2026-04-10 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 210 | $117.45 | $25K | 91K |
| 2026-04-10 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 1K | $116.72 | $144K | 91K |
| 2026-04-02 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Tax withholding | 2K | $109.60 | $174K | 44K |
| 2026-04-02 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 2K | $109.60 | $201K | 92K |
| 2026-04-02 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 1K | $109.60 | $126K | 94K |
| 2026-04-02 | Gilliam Joseph E | PRESIDENT & COO | Tax withholding | 3K | $109.60 | $347K | 93K |
| 2026-04-02 | Burns Thomas William | CHAIRMAN & CEO | Tax withholding | 7K | $109.60 | $818K | 73K |
| 2026-04-02 | Burns Thomas William | CHAIRMAN & CEO | Tax withholding | 2K | $109.60 | $271K | 80K |
| 2026-04-01 | Burns Thomas William | CHAIRMAN & CEO | Gift | 180K | $0.00 | $0 | 1.1M |
| 2026-04-01 | Burns Thomas William | CHAIRMAN & CEO | Gift | 180K | $0.00 | $0 | 83K |
| 2026-03-31 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 6K | $109.60 | $635K | 95K |
| 2026-03-25 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Grant | 3K | $0.00 | $0 | 45K |
| 2026-03-25 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 3K | $106.46 | $267K | 42K |
| 2026-03-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Grant | 13K | $0.00 | $0 | 101K |
| 2026-03-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Grant | 4K | $0.00 | $0 | 88K |
| 2026-03-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Grant | 12K | $0.00 | $0 | 85K |
| 2026-03-25 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Grant | 5K | $0.00 | $0 | 73K |
| 2026-03-25 | Gilliam Joseph E | PRESIDENT & COO | Grant | 18K | $0.00 | $0 | 96K |
| 2026-03-25 | Gilliam Joseph E | PRESIDENT & COO | Grant | 6K | $0.00 | $0 | 78K |
| 2026-03-25 | Burns Thomas William | CHAIRMAN & CEO | Grant | 14K | $0.00 | $0 | 263K |
| 2026-03-25 | Burns Thomas William | CHAIRMAN & CEO | Grant | 9K | $0.00 | $0 | 249K |
| 2026-03-24 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Tax withholding | 2K | $105.23 | $213K | 44K |
| 2026-03-24 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 2K | $105.24 | $160K | 46K |
| 2026-03-24 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 3K | $105.23 | $268K | 68K |
| 2026-03-24 | Gilliam Joseph E | PRESIDENT & COO | Tax withholding | 7K | $105.23 | $777K | 73K |
| 2026-03-24 | Gilliam Joseph E | PRESIDENT & COO | Tax withholding | 5K | $105.23 | $518K | 80K |
| 2026-03-24 | Burns Thomas William | CHAIRMAN & CEO | Tax withholding | 3K | $105.23 | $289K | 240K |
| 2026-03-23 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Tax withholding | 1K | $106.84 | $131K | 48K |
| 2026-03-23 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 3K | $106.84 | $281K | 71K |
| 2026-03-23 | Gilliam Joseph E | PRESIDENT & COO | Tax withholding | 3K | $106.84 | $300K | 85K |
| 2026-03-17 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Sell | 625 | $99.15 | $62K | 49K |
| 2026-03-16 | Thurman Alex R. | SVP & CHIEF FINANCIAL OFFICER | Tax withholding | 614 | $98.94 | $61K | 50K |
| 2026-03-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 272 | $99.05 | $27K | 74K |
| 2026-03-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 299 | $98.21 | $29K | 74K |
| 2026-03-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Sell | 460 | $97.33 | $45K | 74K |
| 2026-03-16 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 958 | $98.94 | $95K | 75K |
| 2026-03-16 | Gilliam Joseph E | PRESIDENT & COO | Tax withholding | 1K | $98.94 | $118K | 88K |
| 2026-03-16 | Burns Thomas William | CHAIRMAN & CEO | Tax withholding | 3K | $98.94 | $277K | 242K |
| 2026-03-13 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 1K | $97.02 | $104K | 76K |
| 2026-03-13 | Gilliam Joseph E | PRESIDENT & COO | Tax withholding | 2K | $97.02 | $239K | 89K |
| 2026-03-13 | Burns Thomas William | CHAIRMAN & CEO | Tax withholding | 5K | $97.02 | $506K | 245K |
| 2026-03-05 | Navratil Tomas | CHIEF DEVELOPMENT OFFICER | Tax withholding | 361 | $112.10 | $40K | 77K |
| 2026-03-05 | Burns Thomas William | CHAIRMAN & CEO | Tax withholding | 1K | $112.10 | $123K | 250K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON34 Form 144 notices on file for GKOS worth $80.0M at the prices reported; 8 in the last 90 days worth $28.7M. Latest: Navratil Tomas filed on 2026-10-30 to sell 44,436 shares ($10.6M) from 2026-10-30.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-10-30 | Navratil TomasOfficer | 44K | $10.6M | 0.075% | 2026-10-30 | Fidelity Brokerage Services LLC |
| 2026-10-05 | Navratil TomasOfficer | 2K | $251K | 0.003% | 2026-10-05 | Fidelity Brokerage Services LLC |
| 2026-09-25 | Navratil TomasOfficer | 2K | $249K | 0.003% | 2026-09-25 | Fidelity Brokerage Services LLC |
| 2026-09-16 | Navratil TomasOfficer | 1K | $243K | 0.002% | 2026-09-16 | Fidelity Brokerage Services LLC |
| 2026-08-28 | Navratil TomasOfficer | 14K | $2.5M | 0.023% | 2026-08-28 | Fidelity Brokerage Services LLC |
| 2026-08-19 | Kliman Gilbert HDirector | 3K | $475K | 0.004% | 2026-08-19 | Fidelity Brokerage Services LLC |
| 2026-08-11 | Gilliam Joseph EOfficer | 60K | $10.8M | 0.102% | 2026-08-11 | Fidelity Brokerage Services LLC |
| 2026-08-07 | Thurman Alex R.Officer | 20K | $3.6M | 0.034% | 2026-08-07 | Fidelity Brokerage Services LLC |
| 2026-07-31 | WEN LEANADirector | 525 | $88K | 0.001% | 2026-07-31 | Fidelity Brokerage Services LLC |
| 2026-07-16 | Thurman Alex R.Officer | 10K | $1.6M | 0.017% | 2026-07-16 | Fidelity Brokerage Services LLC |
| 2026-07-09 | Thurman Alex R.Officer | 10K | $1.6M | 0.017% | 2026-07-09 | Fidelity Brokerage Services LLC |
| 2026-07-06 | Thurman Alex R.Officer | 10K | $1.5M | 0.017% | 2026-07-06 | Fidelity Brokerage Services LLC |
| 2026-07-01 | Navratil TomasOfficer | 716 | $100K | 0.001% | 2026-07-01 | Fidelity Brokerage Services LLC |
| 2026-06-16 | Navratil TomasOfficer | 2K | $201K | 0.003% | 2026-06-16 | Fidelity Brokerage Services LLC |
| 2026-05-14 | Kliman Gilbert HDirector | 5K | $704K | 0.009% | 2026-05-14 | Fidelity Brokerage Services LLC |
| 2026-05-11 | Kliman Gilbert HDirector | 5K | $675K | 0.009% | 2026-05-11 | Fidelity Brokerage Services LLC |
| 2026-05-01 | WEN LEANADirector | 2K | $247K | 0.003% | 2026-05-01 | Fidelity Brokerage Services LLC |
| 2026-05-01 | Gilliam Joseph EOfficer | 20K | $2.8M | 0.033% | 2026-05-01 | Fidelity Brokerage Services LLC |
| 2026-04-30 | Thurman Alex R.Officer | 10K | $1.4M | 0.017% | 2026-04-30 | Fidelity Brokerage Services LLC |
| 2026-04-10 | Navratil TomasOfficer | 2K | $246K | 0.004% | 2026-04-10 | Fidelity Brokerage Services LLC |
| 2026-03-25 | Thurman Alex R.Officer | 3K | $267K | 0.004% | 2026-03-25 | Fidelity Brokerage Services LLC |
| 2026-03-24 | Thurman Alex R.Officer | 2K | $160K | 0.003% | 2026-03-24 | Fidelity Brokerage Services LLC |
| 2026-03-17 | Thurman Alex R.Officer | 625 | $62K | 0.001% | 2026-03-17 | Fidelity Brokerage Services LLC |
| 2026-03-16 | Navratil TomasOfficer | 1K | $101K | 0.002% | 2026-03-16 | Fidelity Brokerage Services LLC |
| 2026-02-19 | WEISNER AIMEE SDirector | 15K | $1.8M | 0.026% | 2026-02-19 | Fidelity Brokerage Services LLC |
| 2026-01-22 | Gilliam Joseph EOfficer | 10K | $1.3M | 0.018% | 2026-01-22 | Fidelity Brokerage Services LLC |
| 2026-01-22 | Stapley MarcDirector | 15K | $1.9M | 0.026% | 2026-01-22 | Fidelity Brokerage Services LLC |
| 2026-01-21 | Gilliam Joseph EOfficer | 5K | $561K | 0.008% | 2026-01-21 | Fidelity Brokerage Services LLC |
| 2026-01-16 | Burns Thomas WilliamOfficer, Director | 187K | $21.5M | 0.325% | 2026-01-16 | Fidelity Brokerage Services LLC |
| 2026-01-08 | Burns Thomas WilliamOfficer, Director | 88K | $10.1M | 0.153% | 2026-01-08 | Fidelity Brokerage Services LLC |
| 2025-12-09 | Kliman Gilbert HDirector | 5K | $536K | 0.009% | 2025-12-09 | Fidelity Brokerage Services LLC |
| 2025-11-25 | Thurman Alex R.Officer | 315 | $33K | 0.001% | 2025-11-25 | Fidelity Brokerage Services LLC |
| 2025-11-18 | Gilliam Joseph EOfficer | 19K | $1.7M | 0.034% | 2025-11-18 | Fidelity Brokerage Services LLC |
| 2025-09-22 | Navratil TomasOfficer | 517 | $44K | 0.001% | 2025-09-22 | Fidelity Brokerage Services LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON4 holders report 5% or more of GKOS in their latest filing, all on Schedule 13G (passive). The largest reported stake is JANUS HENDERSON GROUP PLC at 9.2% of the class (5,348,395 shares), filed 2026-05-15 for an event on 2026-03-31.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-05-15 | 13G/Ano. 1 | JANUS HENDERSON GROUP PLCparent holding company | 5.3M | 9.2% | 2026-03-31 |
| 2026-04-29 | 13G | Vanguard Portfolio Managementinvestment adviser | 3.3M | 5.6% | 2026-03-31 |
| 2026-04-29 | 13G | Vanguard Capital Managementinvestment adviser | 2.9M | 5.1% | 2026-03-31 |
| 2026-03-26 | 13G/Ano. 3 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2026-02-11 | 13G | PRIMECAP MANAGEMENT CO/CA/investment adviser | 3.4M | 5.9% | 2025-12-31 |
| 2026-02-10 | 13G/Ano. 1 | Wellington Management Group LLPparent holding company | 487K | 0.8% | 2025-12-31 |
| 2026-02-10 | 13G/Ano. 1 | Wellington Group Holdings LLPparent holding company | 487K | 0.8% | 2025-12-31 |
| 2026-02-10 | 13G/Ano. 1 | Wellington Investment Advisors Holdings LLPparent holding company | 487K | 0.8% | 2025-12-31 |
13F holders
Tracked managers holding GKOS at their latest 13F. JSON8 of the 30 tracked managers held GKOS at their latest 13F, $474.7M in total at quarter-end prices. Millennium Management is the largest at $221.0M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 2 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 1.6M | $221.0M | 0.08% | +407K |
| Citadel Advisors | 2026-06-30 | 1.4M | $194.3M | 0.02% | -57K |
| Renaissance Technologies | 2026-06-30 | 147K | $20.6M | 0.03% | +28K |
| Point72 Asset Management | 2026-06-30 | 138K | $19.3M | 0.02% | +37K |
| Two Sigma Investments | 2026-06-30 | 63K | $8.9M | 0.01% | 0 |
| D. E. Shaw & Co. | 2026-06-30 | 57K | $8.0M | 0.00% | -194K |
| AQR Capital Management | 2026-06-30 | 16K | $2.3M | 0.00% | +2K |
| Bridgewater Associates | 2026-06-30 | 3K | $463K | 0.00% | new |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
Financials
SEC XBRL, as filed. JSONIn Q3 FY 2026 (quarter ended 2026-09-30) Glaukos reported revenue of $211.0M, up 58.0% from the same quarter a year earlier, and net income of $2.0M (0.03 diluted EPS). In FY 2025 it generated -$14.8M of operating cash flow.
- Cash
- $162.3M
- Equity
- $717.3M
- Total assets
- $979.5M
- Shares outstanding
- 59,196,870
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q3 FY 2026 | 2026-09-30 | $211.0M | $2.0M | 1.0% | 0.03 |
| Q2 FY 2026 | 2026-06-30 | $185.6M | -$18.4M | -9.9% | -0.31 |
| Q1 FY 2026 | 2026-03-31 | $150.6M | -$19.8M | -13.1% | -0.34 |
| Q4 FY 2025derived | 2025-12-31 | $143.1M | -$133.7M | -93.4% | n/a |
| Q3 FY 2025 | 2025-09-30 | $133.5M | -$16.2M | -12.2% | -0.28 |
| Q2 FY 2025 | 2025-06-30 | $124.1M | -$19.7M | -15.8% | -0.34 |
| Q1 FY 2025 | 2025-03-31 | $106.7M | -$18.1M | -17.0% | -0.32 |
| Q4 FY 2024derived | 2024-12-31 | $105.5M | -$33.6M | -31.8% | n/a |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $507.4M | -$187.7M | -$14.8M | $7.7M | n/a | n/a |
| FY 2024 | 2024-12-31 | $383.5M | -$146.4M | -$61.3M | $6.3M | n/a | n/a |
| FY 2023 | 2023-12-31 | $314.7M | -$134.7M | -$57.8M | $20.2M | n/a | n/a |
| FY 2022 | 2022-12-31 | $282.9M | -$99.2M | -$33.1M | $30.3M | n/a | n/a |
| FY 2021 | 2021-12-31 | $294.0M | -$49.6M | $24.7M | $47.8M | n/a | n/a |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-09-30; shares outstanding as of 2026-10-26 from the cover page.
What this page is
Glaukos in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Glaukos (GKOS), SEC CIK 1192448, listed on NYSE, classified by the SEC as surgical & medical instruments & apparatus. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-10-15.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-14.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-10-30.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-05-15.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-09-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-10-28.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-05.JSON and CSV
- Company record
- EDGAR filing index for CIK 1192448Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
Other companies the SEC classifies as surgical & medical instruments & apparatus
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Datasets
Frequently Asked Questions
How much of GKOS is sold short?
4,343,054 shares were held short at the 2026-10-15 settlement, 4.0 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is GKOS's daily short volume?
On 2026-11-02, 235,824 of the 532,072 GKOS shares reported to FINRA were sold short, 44.3% of the day's reported volume. Short volume is a flow for one day, not a position.
Does GKOS have fails to deliver?
The SEC's latest file shows 1,067 GKOS shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.
Are GKOS insiders buying or selling?
Insiders at GKOS reported 21 open-market sells worth $18.1M in the last 90 days and no open-market buys. Latest filing: Navratil Tomas (CHIEF DEVELOPMENT OFFICER) on 2026-10-05.
Have GKOS insiders filed to sell?
34 Form 144 notices on file for GKOS worth $80.0M at the prices reported; 8 in the last 90 days worth $28.7M. Latest: Navratil Tomas filed on 2026-10-30 to sell 44,436 shares ($10.6M) from 2026-10-30.
Who owns 5% or more of GKOS?
4 holders report 5% or more of GKOS in their latest filing, all on Schedule 13G (passive). The largest reported stake is JANUS HENDERSON GROUP PLC at 9.2% of the class (5,348,395 shares), filed 2026-05-15 for an event on 2026-03-31.
What did GKOS report last quarter?
In Q3 FY 2026 (quarter ended 2026-09-30) Glaukos reported revenue of $211.0M, up 58.0% from the same quarter a year earlier, and net income of $2.0M (0.03 diluted EPS). In FY 2025 it generated -$14.8M of operating cash flow.
Which tracked 13F managers own GKOS?
8 of the 30 tracked 13F managers held GKOS shares at their latest filing, $474.7M in all. The largest: Izzy Englander's Millennium Management (1.6M shares, $221.0M), Ken Griffin's Citadel Advisors (1.4M shares, $194.3M), Renaissance Technologies (147K shares, $20.6M), Steve Cohen's Point72 Asset Management (138K shares, $19.3M), Two Sigma Investments (63K shares, $8.9M), D. E. Shaw & Co. (57K shares, $8.0M). The table above lists all 8.
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.