Glaukos Corporation
US ˙ NYSE ˙ US3773221029

SecurityGKOS / Glaukos Corporation
InstitutionHolocene Advisors, LP
Latest Disclosed Ownership1,383,715 shares
Latest Disclosed Value $ 148,970,757
Holocene Advisors, LP reports 6.50% increase in ownership of GKOS / Glaukos Corporation

On May 15, 2026 - Holocene Advisors, LP filed a 13F-HR form disclosing ownership of 1,383,715 shares of Glaukos Corporation (US:GKOS) valued at $148,970,757 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,299,294 shares of Glaukos Corporation. This represents a change in shares of 6.50% during the quarter. The current value of the position is $168,384,278 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 1,383,715 84,421 6.50 148,971 1.55 0.3593
2026-02-17 2025-12-31 13F GLAUKOS COM 377322102 1,299,294 752,242 137.51 146,703 228.84 0.3081
2025-11-14 2025-09-30 13F GLAUKOS COM 377322102 547,052 -498,834 -47.69 44,612 -58.70 0.1016
2025-08-14 2025-06-30 13F GLAUKOS COM 377322102 1,045,886 299,118 40.06 108,030 46.99 0.2636
2025-05-15 2025-03-31 13F GLAUKOS COM 377322102 746,768 437,299 141.31 73,497 58.39 0.2144
2025-02-14 2024-12-31 13F GLAUKOS COM 377322102 309,469 309,469 46,402 0.1486
2023-11-14 2023-09-30 13F GLAUKOS COM 377322102 0 -3,627 -100.00 0 -100.00
2023-08-14 2023-06-30 13F GLAUKOS COM 377322102 3,627 3,627 258 0.0011
2022-08-15 2022-06-30 13F GLAUKOS COM 377322102 0 -27,762 -100.00 0 -100.00
2022-05-16 2022-03-31 13F GLAUKOS COM 377322102 27,762 -28,638 -50.78 1,605 -35.95 0.0084
2022-02-14 2021-12-31 13F GLAUKOS COM 377322102 56,400 15,141 36.70 2,506 26.12 0.0130
2021-11-15 2021-09-30 13F GLAUKOS COM 377322102 41,259 41,259 1,987 0.0108
2021-02-16 2020-12-31 13F GLAUKOS COM 377322102 0 -43,650 -100.00 0 -100.00
2020-11-16 2020-09-30 13F GLAUKOS COM 377322102 43,650 16,032 58.05 2,162 103.77 0.0164
2020-08-14 2020-06-30 13F GLAUKOS COM 377322102 27,618 18,600 206.25 1,061 281.65 0.0093
2020-05-15 2020-03-31 13F GLAUKOS COM 377322102 9,018 9,018 278 0.0030
2019-02-14 2018-12-31 13F GLAUKOS COM 377322102 0 -7,987 -100.00 0 -100.00
2018-11-14 2018-09-30 13F GLAUKOS COM 377322102 7,987 7,987 518 0.0084
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.