Glaukos Corporation
US ˙ NYSE ˙ US3773221029

SecurityGKOS / Glaukos Corporation
InstitutionState Street Corp
Latest Disclosed Ownership2,182,617 shares
Latest Disclosed Value $ 234,980,546
State Street Corp reports 2.84% increase in ownership of GKOS / Glaukos Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 2,182,617 shares of Glaukos Corporation (US:GKOS) valued at $234,980,546 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,122,402 shares of Glaukos Corporation. This represents a change in shares of 2.84% during the quarter. The current value of the position is $265,602,663 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)
2026-05-15 2026-03-31 13F GLAUKOS COM 377322102 2,182,617 60,215 2.84 234,981 -1.94 0.0081
2026-02-13 2025-12-31 13F GLAUKOS COM 377322102 2,122,402 18,040 0.86 239,640 39.64 0.0080
2025-11-14 2025-09-30 13F GLAUKOS COM 377322102 2,104,362 13,997 0.67 171,611 -20.52 0.0060
2025-08-14 2025-06-30 13F GLAUKOS COM 377322102 2,090,365 105,972 5.34 215,914 10.55 0.0081
2025-05-15 2025-03-31 13F GLAUKOS COM 377322102 1,984,393 -79,006 -3.83 195,304 -36.87 0.0080
2025-02-14 2024-12-31 13F GLAUKOS COM 377322102 2,063,399 108,950 5.57 309,386 21.51 0.0122
2024-11-14 2024-09-30 13F GLAUKOS COM 377322102 1,954,449 98,109 5.29 254,626 15.90 0.0104
2024-08-14 2024-06-30 13F GLAUKOS COM 377322102 1,856,340 30,630 1.68 219,698 27.62 0.0096
2024-05-15 2024-03-31 13F GLAUKOS COM 377322102 1,825,710 8,799 0.48 172,146 19.19 0.0077
2024-02-14 2023-12-31 13F GLAUKOS COM 377322102 1,816,911 51,104 2.89 144,426 8.69 0.0070
2023-11-14 2023-09-30 13F GLAUKOS COM 377322102 1,765,807 -16,540 -0.93 132,877 4.69 0.0074
2023-08-14 2023-06-30 13F GLAUKOS COM 377322102 1,782,347 31,471 1.80 126,921 44.69 0.0067
2023-05-15 2023-03-31 13F GLAUKOS COM 377322102 1,750,876 44,555 2.61 87,719 17.69 0.0049
2023-05-15 2022-12-31 13F/A-99 GLAUKOS COM 377322102 1,706,321 10,549 0.62 74,532 -17.45 0.0044
2023-05-15 2022-12-31 13F GLAUKOS COM 377322102 1,706,321 10,549 74,532 0.0044
2022-11-15 2022-09-30 13F GLAUKOS COM 377322102 1,695,772 -2,485 -0.15 90,283 17.05 0.0057
2022-08-15 2022-06-30 13F GLAUKOS COM 377322102 1,698,257 16,315 0.97 77,135 -20.68 0.0046
2022-05-16 2022-03-31 13F GLAUKOS COM 377322102 1,681,942 -11,060 -0.65 97,250 29.26 0.0048
2022-02-14 2021-12-31 13F GLAUKOS COM 377322102 1,693,002 56,547 3.46 75,237 -4.56 0.0036
2021-11-15 2021-09-30 13F GLAUKOS COM 377322102 1,636,455 100,524 6.54 78,828 -39.50 0.0042
2021-08-16 2021-06-30 13F GLAUKOS COM 377322102 1,535,931 83,953 5.78 130,293 6.92 0.0069
2021-07-09 2021-03-31 13F/A-1 GLAUKOS COM 377322102 1,451,978 10,007 0.69 121,865 12.29 0.0070
2021-05-17 2021-03-31 13F GLAUKOS COM 377322102 1,451,978 10,007 121,865 0.0070
2021-02-16 2020-12-31 13F GLAUKOS COM 377322102 1,441,971 13,274 0.93 108,523 53.39 0.0066
2020-11-10 2020-09-30 13F GLAUKOS COM 377322102 1,428,697 7,143 0.50 70,749 29.54 0.0048
2020-08-14 2020-06-30 13F GLAUKOS COM 377322102 1,421,554 97,508 7.36 54,616 33.67 0.0040
2020-06-19 2020-03-31 13F/A-1 GLAUKOS COM 377322102 1,324,046 357,811 37.03 40,860 -22.37 0.0036
2020-05-11 2020-03-31 13F GLAUKOS COM 377322102 1,324,046 357,811 40,860 3,588.3307
2020-02-06 2019-12-31 13F GLAUKOS COM 377322102 966,235 107,198 12.48 52,631 -1.99 0.0036
2019-11-14 2019-09-30 13F GLAUKOS COM 377322102 859,037 13,698 1.62 53,698 -15.75 0.0040
2019-08-14 2019-06-30 13F GLAUKOS COM 377322102 845,339 4,308 0.51 63,739 -3.30 0.0048
2019-05-15 2019-03-31 13F GLAUKOS COM 377322102 841,031 67,577 8.74 65,912 51.71 0.0051
2019-02-12 2018-12-31 13F GLAUKOS COM 377322102 773,454 -70,448 -8.35 43,445 -20.67 0.0040
2018-11-09 2018-09-30 13F GLAUKOS Common equity shares 377322102 843,902 68,982 8.90 54,764 73.92 0.0042
2018-08-14 2018-06-30 13F GLAUKOS Common equity shares 377322102 774,920 127,581 19.71 31,488 57.80 0.0026
2018-05-15 2018-03-31 13F GLAUKOS Common equity shares 377322102 647,339 -3,251 -0.50 19,955 19.61 0.0017
2018-02-14 2017-12-31 13F GLAUKOS Common equity shares 377322102 650,590 75,410 13.11 16,684 -12.12 0.0013
2017-11-14 2017-09-30 13F GLAUKOS Common equity shares 377322102 575,180 29,050 5.32 18,984 -16.16 0.0016
2017-08-14 2017-06-30 13F GLAUKOS Common equity shares 377322102 546,130 203,249 59.28 22,644 28.72 0.0020
2017-05-15 2017-03-31 13F GLAUKOS Common equity shares 377322102 342,881 61,474 21.85 17,591 82.23 0.0016
2017-02-09 2016-12-31 13F GLAUKOS Common equity shares 377322102 281,407 18,183 6.91 9,653 -2.83 0.0009
2017-01-13 2016-09-30 13F/A-1 GLAUKOS Common equity shares 377322102 263,224 10,137 4.01 9,934 34.59 0.0010
2016-11-14 2016-09-30 13F GLAUKOS Common equity shares 377322102 263,224 9,934
2016-08-12 2016-06-30 13F GLAUKOS Common equity shares 377322102 253,087 159,150 169.42 7,381 365.97 0.0008
2016-05-20 2016-03-31 13F/A-1 GLAUKOS Common equity shares 377322102 93,937 5,862 6.66 1,584 -27.14 0.0002
2016-05-12 2016-03-31 13F GLAUKOS Common equity shares 377322102 93,937 1,584
2016-02-16 2015-12-31 13F GLAUKOS Common equity shares 377322102 88,075 15,938 22.09 2,174 24.51 0.0002
2015-11-16 2015-09-30 13F GLAUKOS Common equity shares 377322102 72,137 72,137 1,746 0.0002
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.