William Blair Investment Management, LLC Glaukos Corp Transaction History

William Blair Investment Management, LLC

$35.8 Billion
Q3 2025

A detailed history of William Blair Investment Management, LLC transactions in Glaukos Corp stock. As of the latest transaction made, William Blair Investment Management, LLC holds 1,093,744 shares of GKOS stock, worth $98.5 Million. This represents 0.25% of its overall portfolio holdings.

Number of Shares

1,093,744

Previous 1,136,095 3.73%

Holding current value

$98.5 Million

Previous $117 Million 23.99%

% of portfolio

0.25%

Previous 0.34%

15 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q3 2025 Nov 12, 2025	SELL	$79.92 - $106.55 $3.38 Million - $4.51 Million	-42,351 Reduced 3.73%	1,093,744 $89.2 Million
Q2 2025 Jul 29, 2025	BUY	$82.27 - $103.29 $32.2 Million - $40.4 Million	390,805 Added 52.44%	1,136,095 $117 Million
Q1 2025 May 09, 2025	SELL	$96.6 - $161.22 $6.21 Million - $10.4 Million	-64,299 Reduced 7.94%	745,290 $73.4 Million
Q4 2024 Feb 10, 2025	BUY	$126.42 - $152.67 $102 Million - $124 Million	809,589 New	809,589 $121 Million
Q1 2020 May 08, 2020	SELL	$25.53 - $70.14 $50.5 Million - $139 Million	-1,976,525 Closed	0 $0

Q4 2019 Feb 12, 2020	SELL	$54.18 - $65.64 $22.6 Million - $27.3 Million	-416,534 Reduced 17.41%	1,976,525 $108 Million
Q3 2019 Nov 12, 2019	SELL	$58.58 - $83.91 $1.17 Million - $1.68 Million	-19,963 Reduced 0.83%	2,393,059 $150 Million
Q2 2019 Aug 09, 2019	SELL	$63.59 - $78.71 $3.33 Million - $4.13 Million	-52,410 Reduced 2.13%	2,413,022 $182 Million
Q1 2019 May 10, 2019	BUY	$50.75 - $80.54 $477,100 - $757,156	9,401 Added 0.38%	2,465,432 $193 Million
Q4 2018 Feb 13, 2019	BUY	$52.18 - $67.93 $682,984 - $889,135	13,089 Added 0.54%	2,456,031 $138 Million
Q3 2018 Nov 13, 2018	SELL	$38.13 - $68.37 $9.47 Million - $17 Million	-248,266 Reduced 9.23%	2,442,942 $159 Million
Q2 2018 Aug 14, 2018	SELL	$27.62 - $44.51 $2.15 Million - $3.46 Million	-77,837 Reduced 2.81%	2,691,208 $109 Million
Q1 2018 May 14, 2018	BUY	$26.05 - $34.5 $20.6 Million - $27.2 Million	789,085 Added 39.85%	2,769,045 $85.4 Million
Q4 2017 Feb 14, 2018	BUY	$24.5 - $36.01 $3.38 Million - $4.97 Million	137,969 Added 7.49%	1,979,960 $50.8 Million
Q3 2017 Nov 13, 2017	BUY	$31.26 - $42.03 $57.6 Million - $77.4 Million	1,841,991	1,841,991 $60.8 Million

Others Institutions Holding GKOS

# of Institutions

351

Shares Held

55.3M

Call Options Held

163K

Put Options Held

458K

View Full List

About GLAUKOS Corp

Ticker GKOS
Exchange NYSE
Sector Healthcare
Industry Medical Devices
Shares Outstandng 47,596,900
Market Cap $4.29B
Description
Glaukos Corporation, an ophthalmic medical technology and pharmaceutical company, focuses on the development of novel therapies for the treatment of glaucoma, corneal disorders, and retinal diseases. It offers iStent, iStent inject, iStent inject W micro-bypass stents that enhance aqueous humor outflow inserted in cataract surgery to treat mild-...

More about GKOS

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William Blair Investment Management, LLC Glaukos Corp Transaction History