Glaukos

GKOS • NYSE

Glaukos is a medical - devices company in the healthcare sector on NYSE, led by Thomas W. Burns, with a market cap of $6.3B. As of Q3 2025, 98% of shares are held by 308 institutional investors, with BlackRock, Inc. as the largest holder at 15.09%.

President, Chief Executive Officer, and Chairman of the BoardThomas W. Burns

Market Cap$6.3B

Medical - Devices

Healthcare

Employees907.0

Websiteglaukos.com

Country

United States of America

Overview

Overview of institutional ownership in GKOS as of Q3 2025 with a market cap of $4.7B

All Institutions

Institutions: 308
Value Held: $4.6B
Shares Held: 55.9M
Avg Position: $14.8M
Median Position: $1.0M

Hedge Funds

Hedge Funds: 39
Value Held: $384.1M
Shares Held: 4.7M
Avg Position: $9.8M
Median Position: $1.6M

Ownership Breakdown

Institutional (non-HF)

89.31%

$4.2B

Hedge Funds

8.21%

$384.1M

Retail & Other

2.48%

$116.0M

Based on market cap of $4.7B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in GKOS as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$705.9M 0.01% of portfolio	15.09% 8.7M shares	Q1 2016 Held for 9y 8m	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$493.1M 0.01% of portfolio	10.54% 6.0M shares	Q2 2015 Held for 10y 5m	$6.69T
WELLINGTON MANAGEMENT CO LLP Long Only Manager	Jean Marie Hynes CEO	$292.0M 0.05% of portfolio	6.24% 3.6M shares	Q3 2020 Held for 5y 2m	$571.21B
PRIMECAP MANAGEMENT CO/CA/ Long Only Manager	Theofanis A Kolokotrones Chairman	$183.8M 0.14% of portfolio	3.93% 2.3M shares	Q4 2017 Held for 7y 11m	$128.84B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$171.6M 0.01% of portfolio	3.67% 2.1M shares	Q3 2015 Held for 10y 2m	$2.88T
AMERIPRISE FINANCIAL INC Institution	Jim Cracchiolo CEO	$155.0M 0.04% of portfolio	3.31% 1.9M shares	Q2 2015 Held for 10y 5m	$433.11B
ALLIANCEBERNSTEIN L.P. Long Only Manager	Seth Perry Bernstein CEO	$141.4M 0.04% of portfolio	3.02% 1.7M shares	Q2 2015 Held for 10y 5m	$317.45B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$107.3M 0.01% of portfolio	2.29% 1.3M shares	Q3 2015 Held for 10y 2m	$1.57T
WESTFIELD CAPITAL MANAGEMENT CO LP Long Only Manager	William Albert Muggia CEO	$100.4M 0.42% of portfolio	2.15% 1.2M shares	Q3 2024 Held for 1y 2m	$23.8B
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Long Only Manager	Brent Walker Gledhill CEO	$89.2M 0.23% of portfolio	1.91% 1.1M shares	Q4 2024 Held for 11 months	$38.7B

Net Capital Flow

Institutional buying and selling activity for GKOS in Q3 2025

Traded: +$140.5M
Buyers: 165
Sellers: 152
Total Bought: +$579.0M
Total Sold: −$438.6M
Avg Position: $13.1M

Biggest Buyers

Institution	Net Bought	Current Position
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$74.5M +913.4K shares	$74.5M 913.4K shares
M MACQUARIE GROUP LTD Institution	+$42.9M +526.4K shares	$48.9M 600.2K shares
ALLIANCEBERNSTEIN L.P. Long Only Manager	+$39.3M +481.6K shares	$141.4M 1.7M shares
PRIMECAP MANAGEMENT CO/CA/ Long Only Manager	+$34.7M +425.8K shares	$183.8M 2.3M shares
T T. Rowe Price Investment Management, Inc. Insurance Manager	+$32.3M +395.7K shares	$32.3M 395.7K shares
WELLINGTON MANAGEMENT CO LLP Long Only Manager	+$27.4M +336.3K shares	$292.0M 3.6M shares
S Sofinnova Ventures Inc Venture Capital	+$25.5M +313.0K shares	$25.5M 313.0K shares
D D. E. Shaw & Co., Inc. Institution	+$22.7M +278.4K shares	$22.7M 278.4K shares
C Capital International Investors Institution	+$21.6M +265.0K shares	$41.7M 511.5K shares
J JANE STREET GROUP, LLC Institution	+$18.0M +221.0K shares	$25.1M 307.2K shares

Biggest Sellers

Institution	Net Sold	Current Position
DRIEHAUS CAPITAL MANAGEMENT LLC Hedge Fund•Event Driven	−$51.7M −500.5K shares	Sold Off 0 shares
Holocene Advisors, LP Hedge Fund•Long/Short	−$40.7M −498.8K shares	$44.6M 547.1K shares
Invesco Ltd. ETF Provider	−$31.8M −389.7K shares	$49.5M 607.4K shares
BROWN CAPITAL MANAGEMENT LLC Long Only Manager	−$30.7M −376.4K shares	$62.2M 762.8K shares
GILDER GAGNON HOWE & CO LLC RIA/Wealth	−$29.9M −366.1K shares	$27.3M 334.5K shares
N NEW YORK STATE COMMON RETIREMENT FUND Institution	−$27.4M −335.7K shares	$4.3M 52.2K shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	−$21.6M −264.6K shares	$4.6M 55.9K shares
Polar Securities Inc. Hedge Fund•Multi-Strategy	−$18.3M −177.1K shares	Sold Off 0 shares
LOOMIS SAYLES & CO L P Long Only Manager	−$11.9M −146.2K shares	$36.5M 447.4K shares
UBS GLOBAL ASSET MANAGEMENT AMERICAS INC Long Only Manager	−$10.9M −133.8K shares	$11.9M 145.6K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited GKOS in Q3 2025

New Positions: 19
New Value: $61.7M
Exited Positions: 39
Exited Value: $105.9M

New Positions

Institution	Position Value
T T. Rowe Price Investment Management, Inc. Insurance Manager	$32.3M 395.7K shares
S Sofinnova Ventures Inc Venture Capital	$25.5M 313.0K shares
E Entropy Technologies, LP Hedge Fund•Quant Macro	$1.6M 19.5K shares
SummitTX Capital, L.P. Hedge Fund•Multi-Strategy	$1.3M 16.1K shares
G GTS SECURITIES LLC Institution	$349.6K 4.3K shares
H Headlands Technologies LLC Institution	$307.9K 3.8K shares
Summit Global Investments Long Only Manager	$228.8K 2.8K shares
REAP Financial Group, LLC RIA/Wealth	$39.6K 486.0 shares
S Salomon & Ludwin, LLC Institution	$18.8K 215.0 shares
Sontag Advisory, LLC RIA/Wealth	$13.2K 162.0 shares

Exited Positions

Institution	Previous Position
DRIEHAUS CAPITAL MANAGEMENT LLC Hedge Fund•Event Driven	$51.7M 500.5K shares
Polar Securities Inc. Hedge Fund•Multi-Strategy	$18.3M 177.1K shares
D Divisadero Street Capital Management, LP Hedge Fund•Long/Short	$10.5M 101.8K shares
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	$7.7M 75.0K shares
Eversept Partners, LLC Hedge Fund•Long/Short	$3.3M 31.5K shares
ARMISTICE CAPITAL, LLC Hedge Fund•Long/Short	$3.2M 31.4K shares
LAZARD ASSET MANAGEMENT LLC Long Only Manager	$2.7M 25.8K shares
T TEXAS PERMANENT SCHOOL FUND Institution	$2.0M 19.7K shares
Z Zweig-DiMenna Associates LLC Hedge Fund•Long/Short	$888.3K 8.6K shares
Centiva Capital, LP Hedge Fund•Multi-Strategy	$630.8K 6.1K shares

Options Activity

Institutions with the largest Call and Put options positions in GKOS as of Q3 2025

Call Positions: 11
Call Value: $13.3M
Put Positions: 5
Put Value: $35.1M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$4.4M 541.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$3.5M 424.0 contracts
Walleye Trading LLC RIA/Wealth	$2.1M 252.0 contracts
Caption Management, LLC Hedge Fund•Long/Short	$1.6M 193.0 contracts
J JANE STREET GROUP, LLC Institution	$619.8K 76.0 contracts
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	$497.5K 61.0 contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$407.8K 50.0 contracts
W WOLVERINE TRADING, LLC Institution	$284.5K 35.0 contracts
UBS Group AG Institution	- - contracts
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC Hedge Fund•Long/Short	- - contracts

Put Positions

Institution	Position Value
J JANE STREET GROUP, LLC Institution	$28.8M 3.5K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$2.3M 278.0 contracts
W WOLVERINE TRADING, LLC Institution	$2.0M 251.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$2.0M 240.0 contracts
S Squarepoint Ops LLC Hedge Fund•Quant	- - contracts

Most Committed Institutions

Institutions with GKOS as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
Iron Triangle Partners LP Hedge Fund•Long/Short	Michael John O'Brien CFO	3.98% $28.0M	0.60% 342.8K shares	Q2 2023 Held for 2y 5m	$703.3M
B BRAIDWELL LP Hedge Fund•Multi-Strategy	Brian James Kreiter CEO	2.57% $63.6M	1.36% 780.2K shares	Q4 2022 Held for 2y 11m	$2.5B
BROWN CAPITAL MANAGEMENT LLC Long Only Manager	Keith Allison Lee CEO	2.56% $62.2M	1.33% 762.8K shares	Q4 2018 Held for 6y 11m	$2.4B
Rhenman & Partners Asset Management AB RIA/Wealth	William Eddy Roark Managing Partner	2.08% $18.8M	0.40% 230.0K shares	Q2 2016 Held for 9y 5m	$903.7M
S Sofinnova Ventures Inc Venture Capital	James Irvin Healy Managing Partner	1.57% $25.5M	0.55% 313.0K shares	Q3 2025 Held for 2 months	$1.6B
Exome Asset Management LLC Hedge Fund•Sector	Alex R Forschner President	1.50% $2.2M	0.05% 27.1K shares	Q3 2025 Held for 2 months	$148.0M
Atika Capital Management LLC Hedge Fund•Long/Short	Bradley Seth Farber Managing Partner	1.48% $17.3M	0.37% 212.4K shares	Q2 2023 Held for 2y 5m	$1.2B
Taylor Frigon Capital Management LLC RIA/Wealth	Gerard Joseph Frigon CIO	1.17% $2.3M	0.05% 28.8K shares	Q4 2017 Held for 7y 11m	$201.1M
RIVERBRIDGE PARTNERS LLC Long Only Manager	Mark Albright Thompson Chairman	0.79% $46.5M	0.99% 569.6K shares	Q2 2021 Held for 4y 5m	$5.9B
OSTERWEIS CAPITAL MANAGEMENT INC Long Only Manager	Carl Philip Kaufman CEO	0.68% $11.6M	0.25% 142.3K shares	Q1 2025 Held for 8 months	$1.7B

Hedge Fund Spotlight

Discover hedge funds investing in GKOS

TWO SIGMA INVESTMENTS LLC

Hedge Fund • Multi-Strategy

Portfolio ManagerScott David Hoffman

Portfolio Value: $62.0B
Positions: 3,252
Last Reported: Q3 2025

Sector Allocation

Position in Glaukos

Market Value: $5.5M
Shares Held: 66.9K
Portfolio Weight: 0.01%
Owned Since: 2025-Q3

Top Holding	Sector	Market Value	Weight
1 SPDR S&P 500 ETF Trust SPY	ETF ETF	$680.4M	1.10%
2 Financial Select Sector SPDR Fund XLF	ETF ETF	$582.6M	0.94%
3 Consumer Staples Select Sector SPDR Fund XLP	ETF ETF	$489.6M	0.79%