Glaukos Corporation
US ˙ NYSE ˙ US3773221029

SecurityGKOS / Glaukos Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership576,209 shares
Latest Disclosed Value $ 62,034,662
Northern Trust Corp reports 1.86% decrease in ownership of GKOS / Glaukos Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 576,209 shares of Glaukos Corporation (US:GKOS) valued at $62,034,661 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 587,130 shares of Glaukos Corporation. This represents a change in shares of -1.86% during the quarter. The current value of the position is $70,118,873 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F GLAUKOS COM 377322102 576,209 -10,921 -1.86 62,035 -6.42 0.0017
2026-02-17 2025-12-31 13F GLAUKOS COM 377322102 587,130 -40,530 -6.46 66,293 29.51 0.0085
2025-11-14 2025-09-30 13F GLAUKOS COM 377322102 627,660 -7,352 -1.16 51,186 -21.96 0.0065
2025-08-13 2025-06-30 13F GLAUKOS COM 377322102 635,012 65,283 11.46 65,590 16.97 0.0090
2025-05-13 2025-03-31 13F GLAUKOS COM 377322102 569,729 -8,944 -1.55 56,073 -35.38 0.0083
2025-02-14 2024-12-31 13F GLAUKOS COM 377322102 578,673 40,052 7.44 86,766 23.65 0.0123
2024-11-13 2024-09-30 13F GLAUKOS COM 377322102 538,621 17,715 3.40 70,172 13.82 0.0115
2024-08-14 2024-06-30 13F GLAUKOS COM 377322102 520,906 -11,911 -2.24 61,649 22.71 0.0104
2024-05-14 2024-03-31 13F GLAUKOS COM 377322102 532,817 -9,891 -1.82 50,239 16.46 0.0087
2024-02-13 2023-12-31 13F GLAUKOS COM 377322102 542,708 -9,609 -1.74 43,140 3.80 0.0078
2023-11-13 2023-09-30 13F GLAUKOS COM 377322102 552,317 2,490 0.45 41,562 6.15 0.0081
2023-08-11 2023-06-30 13F GLAUKOS COM 377322102 549,827 9,999 1.85 39,153 44.77 0.0075
2023-05-15 2023-03-31 13F GLAUKOS COM 377322102 539,828 3,752 0.70 27,045 15.50 0.0054
2023-02-13 2022-12-31 13F GLAUKOS COM 377322102 536,076 3,922 0.74 23,416 -17.35 0.0049
2022-11-14 2022-09-30 13F GLAUKOS COM 377322102 532,154 29 0.01 28,332 17.22 0.0065
2022-08-12 2022-06-30 13F GLAUKOS COM 377322102 532,125 -10,804 -1.99 24,169 -23.01 0.0052
2022-05-13 2022-03-31 13F GLAUKOS COM 377322102 542,929 -20,835 -3.70 31,392 25.30 0.0055
2022-02-08 2021-12-31 13F GLAUKOS COM 377322102 563,764 -4,879 -0.86 25,054 -8.54 0.0041
2021-11-15 2021-09-30 13F GLAUKOS COM 377322102 568,643 438 0.08 27,392 -43.17 0.0048
2021-08-13 2021-06-30 13F GLAUKOS COM 377322102 568,205 53,129 10.31 48,200 11.50 0.0085
2021-05-12 2021-03-31 13F GLAUKOS COM 377322102 515,076 4,535 0.89 43,230 12.51 0.0080
2021-02-11 2020-12-31 13F GLAUKOS COM 377322102 510,541 -12,873 -2.46 38,422 48.24 0.0075
2020-11-16 2020-09-30 13F GLAUKOS COM 377322102 523,414 -64,607 -10.99 25,919 14.73 0.0057
2020-08-14 2020-06-30 13F GLAUKOS COM 377322102 588,021 67,949 13.07 22,592 40.76 0.0054
2020-05-14 2020-03-31 13F GLAUKOS COM 377322102 520,072 -13,363 -2.51 16,050 -44.76 0.0046
2020-02-14 2019-12-31 13F GLAUKOS COM 377322102 533,435 21,698 4.24 29,057 -9.16 0.0065
2019-11-13 2019-09-30 13F GLAUKOS COM 377322102 511,737 43,182 9.22 31,988 -9.46 0.0077
2019-08-13 2019-06-30 13F GLAUKOS COM 377322102 468,555 -8,981 -1.88 35,330 -5.60 0.0084
2019-05-13 2019-03-31 13F GLAUKOS COM 377322102 477,536 5,750 1.22 37,425 41.23 0.0092
2019-02-12 2018-12-31 13F GLAUKOS COM 377322102 471,786 -4,099 -0.86 26,500 -14.20 0.0074
2018-11-14 2018-09-30 13F GLAUKOS COM 377322102 475,885 13,380 2.89 30,885 64.32 0.0076
2018-09-18 2018-06-30 13F/A-1 GLAUKOS COM 377322102 462,505 56,902 14.03 18,796 50.30 0.0048
2018-08-14 2018-06-30 13F GLAUKOS COM 377322102 464,714 59,111 18,885
2018-05-09 2018-03-31 13F GLAUKOS COM 377322102 405,603 39,029 10.65 12,506 33.01 0.0033
2018-02-14 2017-12-31 13F GLAUKOS COM 377322102 366,574 -5,804 -1.56 9,402 -23.49 0.0024
2017-11-13 2017-09-30 13F GLAUKOS COM 377322102 372,378 121,036 48.16 12,289 17.89 0.0032
2017-08-11 2017-06-30 13F GLAUKOS COM 377322102 251,342 33,017 15.12 10,424 -6.92 0.0029
2017-05-12 2017-03-31 13F GLAUKOS COM 377322102 218,325 1,294 0.60 11,199 50.44 0.0032
2017-02-13 2016-12-31 13F GLAUKOS COM 377322102 217,031 -30,005 -12.15 7,444 -20.15 0.0023
2016-11-09 2016-09-30 13F GLAUKOS COM 377322102 247,036 66,210 36.62 9,323 76.84 0.0029
2016-08-12 2016-06-30 13F GLAUKOS COM 377322102 180,826 99,096 121.25 5,272 281.75 0.0017
2016-08-19 2016-03-31 13F/A-1 GLAUKOS COM 377322102 81,730 2,724 3.45 1,381 -29.18 0.0005
2016-05-13 2016-03-31 13F Glaukos COMM 377322102 81,730 1,378
2016-02-12 2015-12-31 13F Glaukos COMM 377322102 79,006 61,802 359.23 1,950 368.75 0.0006
2015-11-12 2015-09-30 13F Glaukos COMM 377322102 17,204 17,204 416 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.