Glaukos Corporation
US ˙ NYSE ˙ US3773221029

SecurityGKOS / Glaukos Corporation
InstitutionFmr Llc
Latest Disclosed Ownership2,561,428 shares
Ownership 4.50%
Fmr Llc ownership in GKOS / Glaukos Corporation

2025-08-07 - Fmr Llc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2,561,428 shares of Glaukos Corporation (US:GKOS). This represents 4.5 percent ownership of the company. In their previous filing dated 2025-02-12 , Fmr Llc had reported owning 6,078,556 shares, indicating a decrease of -57.86 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2025-08-07 2025-08-07 13G/A 6,078,556 2,561,428 -57.86 4.50 -59.09
2025-02-12 2025-02-12 13G/A 5,893,983 6,078,556 3.13 11.00 -8.78
2024-02-09 2024-02-09 13G/A 4,996,960 5,893,983 17.95 12.06 17.95
2023-12-11 2023-12-11 13G 1,081,013 4,996,960 362.25 10.22 309.78
2020-02-07 2020-02-07 13G/A 2,280,178 1,081,013 -52.59 2.50 -60.57
2019-02-13 2019-02-13 13G 2,280,178 6.33

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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 303,266 293,183 2,907.70 32,650 2,768.98 0.0003
2026-02-17 2025-12-31 13F GLAUKOS COM 377322102 10,083 -111,323 -91.69 1,138 -88.51 0.0001
2025-11-13 2025-09-30 13F GLAUKOS COM 377322102 121,406 -6,215,213 -98.08 9,901 -98.49 0.0005
2025-08-14 2025-06-30 13F GLAUKOS COM 377322102 6,336,619 -201,028 -3.07 654,509 1.72 0.0369
2025-05-12 2025-03-31 13F GLAUKOS COM 377322102 6,537,647 425,891 6.97 643,435 -29.79 0.0411
2025-02-13 2024-12-31 13F GLAUKOS COM 377322102 6,111,756 -472,732 -7.18 916,397 6.83 0.0547
2024-11-13 2024-09-30 13F GLAUKOS COM 377322102 6,584,488 -203,431 -3.00 857,827 6.78 0.0522
2024-08-13 2024-06-30 13F GLAUKOS COM 377322102 6,787,919 -569,002 -7.73 803,350 15.81 0.0514
2024-05-13 2024-03-31 13F GLAUKOS COM 377322102 7,356,921 1,537,811 26.43 693,684 49.97 0.0466
2024-02-13 2023-12-31 13F GLAUKOS COM 377322102 5,819,110 2,336,733 67.10 462,561 76.52 0.0355
2023-11-13 2023-09-30 13F GLAUKOS COM 377322102 3,482,377 3,479,548 122,995.69 262,049 130,272.14 0.0226
2023-08-11 2023-06-30 13F GLAUKOS COM 377322102 2,829 -130 -4.39 201 35.81 0.0000
2023-08-11 2023-03-31 13F/A-1 GLAUKOS COM 377322102 2,959 683 30.01 148 49.49 0.0000
2023-05-11 2023-03-31 13F GLAUKOS COM 377322102 2,959 683 148 0.0000
2023-02-13 2022-12-31 13F GLAUKOS COM 377322102 2,276 -616 -21.30 99 -36.13 0.0000
2022-11-10 2022-09-30 13F GLAUKOS COM 377322102 2,892 322 12.53 155 32.48 0.0000
2022-08-12 2022-06-30 13F GLAUKOS COM 377322102 2,570 -1,194 -31.72 117 -46.08 0.0000
2022-05-13 2022-03-31 13F GLAUKOS COM 377322102 3,764 1,384 58.15 217 104.72 0.0000
2022-02-14 2021-12-31 13F GLAUKOS COM 377322102 2,380 -8,242 -77.59 106 -79.26 0.0000
2022-02-14 2021-09-30 13F/A-1 GLAUKOS COM 377322102 10,622 -283,880 -96.39 511 -97.95 0.0000
2021-11-15 2021-09-30 13F GLAUKOS COM 377322102 10,622 -283,880 511 0.0000
2021-08-13 2021-06-30 13F GLAUKOS COM 377322102 294,502 -4,558 -1.52 24,982 -0.47 0.0020
2021-05-14 2021-03-31 13F GLAUKOS COM 377322102 299,060 -46,882 -13.55 25,100 -3.60 0.0021
2021-02-08 2020-12-31 13F GLAUKOS COM 377322102 345,942 25,599 7.99 26,036 64.13 0.0023
2020-11-13 2020-09-30 13F GLAUKOS COM 377322102 320,343 26,192 8.90 15,863 40.37 0.0016
2020-08-24 2020-06-30 13F/A-1 GLAUKOS COM 377322102 294,151 281,620 2,247.39 11,301 2,820.16 0.0012
2020-08-13 2020-06-30 13F GLAUKOS COM 377322102 294,151 281,620 11,301 277.6325
2020-05-14 2020-03-31 13F GLAUKOS COM 377322102 12,531 -1,068,482 -98.84 387 -99.34 0.0001
2020-02-07 2019-12-31 13F GLAUKOS COM 377322102 1,081,013 109,971 11.33 58,883 -2.99 0.0065
2019-11-13 2019-09-30 13F GLAUKOS COM 377322102 971,042 -440,268 -31.20 60,700 -42.96 0.0073
2019-08-13 2019-06-30 13F GLAUKOS COM 377322102 1,411,310 -366,987 -20.64 106,412 -23.65 0.0124
2019-05-13 2019-03-31 13F GLAUKOS COM 377322102 1,778,297 -501,881 -22.01 139,365 8.81 0.0167
2019-02-13 2018-12-31 13F GLAUKOS COM 377322102 2,280,178 1,052,748 85.77 128,077 60.78 0.0175
2018-11-09 2018-09-30 13F GLAUKOS COM 377322102 1,227,430 171,268 16.22 79,660 85.59 0.0090
2018-08-10 2018-06-30 13F GLAUKOS COM 377322102 1,056,162 171,092 19.33 42,923 57.30 0.0051
2018-05-14 2018-03-31 13F GLAUKOS COM 377322102 885,070 742,326 520.04 27,287 272.62 0.0032
2017-05-11 2017-03-31 13F GLAUKOS COM 377322102 142,744 142,744 7,323 0.0009
2016-05-16 2016-03-31 13F GLAUKOS COM 377322102 0 -379,549 -100.00 0 -100.00
2016-02-12 2015-12-31 13F GLAUKOS COM 377322102 379,549 -859,951 -69.38 9,371 -68.75 0.0013
2015-11-10 2015-09-30 13F GLAUKOS COM 377322102 1,239,500 -29,079 -2.29 29,983 -18.44 0.0043
2015-08-25 2015-06-30 13F/A-1 GLAUKOS COM 377322102 1,268,579 1,268,579 36,763 0.0047
2015-08-13 2015-06-30 13F GLAUKOS COM 377322102 1,268,579 36,763 0.0047
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.