Glaukos Corporation
US ˙ NYSE ˙ US3773221029

SecurityGKOS / Glaukos Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership181,853 shares
Latest Disclosed Value $ 20,533,156
Sei Investments Co reports 22.78% increase in ownership of GKOS / Glaukos Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 181,853 shares of Glaukos Corporation (US:GKOS) valued at $20,533,022 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 148,108 shares of Glaukos Corporation. This represents a change in shares of 22.78% during the quarter. The current value of the position is $22,129,692 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)
2026-02-13 2025-12-31 13F GLAUKOS COM 377322102 181,853 33,745 22.78 20,533 70.02 0.0203
2025-11-13 2025-09-30 13F GLAUKOS COM 377322102 148,108 27,353 22.65 12,078 -3.17 0.0130
2025-08-14 2025-06-30 13F GLAUKOS COM 377322102 120,755 19,682 19.47 12,473 25.33 0.0145
2025-05-14 2025-03-31 13F/A-1 GLAUKOS COM 377322102 101,073 12,383 13.96 9,951 -25.17 0.0128
2025-05-13 2025-03-31 13F GLAUKOS COM 377322102 106,135 17,445 14,497 0.0158
2025-02-11 2024-12-31 13F GLAUKOS COM 377322102 88,690 -17,633 -16.58 13,298 -3.99 0.0171
2024-11-12 2024-09-30 13F GLAUKOS COM 377322102 106,323 -2,223 -2.05 13,851 7.82 0.0180
2024-08-13 2024-06-30 13F GLAUKOS COM 377322102 108,546 36,933 51.57 12,847 90.25 0.0182
2024-05-07 2024-03-31 13F GLAUKOS COM 377322102 71,613 1,190 1.69 6,752 20.64 0.0099
2024-02-14 2023-12-31 13F GLAUKOS COM 377322102 70,423 -319 -0.45 5,598 5.15 0.0090
2023-11-14 2023-09-30 13F GLAUKOS COM 377322102 70,742 10,811 18.04 5,323 24.75 0.0096
2023-08-11 2023-06-30 13F GLAUKOS COM 377322102 59,931 7,783 14.92 4,268 63.36 0.0074
2023-05-12 2023-03-31 13F GLAUKOS COM 377322102 52,148 -18,819 -26.52 2,613 -15.71 0.0049
2023-02-10 2022-12-31 13F GLAUKOS COM 377322102 70,967 34,860 96.55 3,100 61.24 0.0069
2022-11-14 2022-09-30 13F GLAUKOS COM 377322102 36,107 9,458 35.49 1,922 58.84 0.0043
2022-08-15 2022-06-30 13F GLAUKOS COM 377322102 26,649 -4,768 -15.18 1,210 -33.41 0.0026
2022-05-13 2022-03-31 13F GLAUKOS COM 377322102 31,417 3,834 13.90 1,817 48.21 0.0037
2022-02-14 2021-12-31 13F GLAUKOS COM 377322102 27,583 5,483 24.81 1,226 15.12 0.0023
2021-11-12 2021-09-30 13F GLAUKOS COM 377322102 22,100 -16,113 -42.17 1,065 -67.15 0.0022
2021-08-06 2021-06-30 13F GLAUKOS COM 377322102 38,213 14,499 61.14 3,242 62.91 0.0072
2021-05-12 2021-03-31 13F GLAUKOS COM 377322102 23,714 -291 -1.21 1,990 10.13 0.0050
2021-02-08 2020-12-31 13F GLAUKOS COM 377322102 24,005 3,426 16.65 1,807 77.33 0.0047
2020-12-04 2020-09-30 13F/A-1 GLAUKOS COM 377322102 20,579 -143 -0.69 1,019 28.02 0.0030
2020-11-06 2020-09-30 13F GLAUKOS COM 377322102 20,579 -143 1,019 2,453.5254
2020-08-17 2020-06-30 13F/A-1 GLAUKOS COM 377322102 20,722 -18,732 -47.48 796 -34.65 0.0025
2020-08-11 2020-06-30 13F GLAUKOS COM 377322102 22,832 -16,622 1,244 3,374.4162
2020-05-14 2020-03-31 13F GLAUKOS COM 377322102 39,454 16,622 72.80 1,218 -2.09 0.0045
2020-02-06 2019-12-31 13F GLAUKOS COM 377322102 22,832 3,202 16.31 1,244 1.06 0.0037
2019-11-12 2019-09-30 13F GLAUKOS COM 377322102 19,630 -13,502 -40.75 1,231 -50.72 0.0031
2019-08-14 2019-06-30 13F GLAUKOS COM 377322102 33,132 8,056 32.13 2,498 27.12 0.0082
2019-05-15 2019-03-31 13F GLAUKOS COM 377322102 25,076 22,954 1,081.72 1,965 1,323.91 0.0066
2019-02-13 2018-12-31 13F GLAUKOS COM 377322102 2,122 0 0.00 138 0.00 0.0005
2018-11-08 2018-09-30 13F GLAUKOS COM 377322102 2,122 122 6.10 138 70.37 0.0005
2018-08-03 2018-06-30 13F GLAUKOS COM 377322102 2,000 1,868 1,415.15 81 1,925.00 0.0003
2018-05-11 2018-03-31 13F GLAUKOS COM 377322102 132 132 4 0.0000
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.