Janus Henderson Group plc reports beneficial ownership of 5,348,395 shares of Glaukos Corp common stock. The filing states the shares are held by multiple Janus Henderson asset managers on behalf of managed portfolios and are reported with shared voting and dispositive power of 5,348,395 shares, representing 9.2% of the class. The filing disclaims rights to dividend or sale proceeds by the asset managers and identifies related exhibits for subsidiary classification.
Positive
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Negative
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Insights
Large passive holding disclosed: 5,348,395 shares (9.2%) reported across Janus Henderson asset managers.
Janus Henderson Group plc reports aggregated beneficial ownership through multiple SEC‑registered asset managers exercising investment and voting discretion for client accounts. The filing attributes shared voting and shared dispositive power for the full 5,348,395 shares.
Exhibits are referenced for subsidiary identification; subsequent filings may name the specific advisory entities that hold the positions and clarify any change in classification or control.
This is a Schedule 13G/A passive ownership amendment, not an active acquisition notice.
The schedule explains the Asset Managers may be deemed beneficial owners due to voting/dispositive discretion for client Managed Portfolios and includes a disclaimer that the managers do not have rights to dividends or sale proceeds. Item 7 and Exhibit 99 are referenced for subsidiary details.
Materiality is procedural: the filing documents ownership above the 5% threshold and records the reporting structure rather than a transaction.
Key Figures
Beneficially owned shares:5,348,395 sharesPercent of class:9.2%Shared voting power:5,348,395 shares+3 more
6 metrics
Beneficially owned shares5,348,395 sharesAmount beneficially owned as reported in Item 4
Percent of class9.2%Percent of class reported in Item 4(b)
Shared voting power5,348,395 sharesShared power to vote, Item 4(c)(ii)
Shared dispositive power5,348,395 sharesShared power to dispose, Item 4(c)(iv)
CUSIP377322102Identifies Glaukos common stock on cover
Filing amendment date shown03/31/2026Date appearing near cover information
"As a result of their exercise of investment and/or voting discretion, the Asset Managers may be deemed to be the beneficial owner"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
Shared dispositive powerregulatory
"Shared power to dispose or to direct the disposition of: 5348395"
Managed Portfoliosfinancial
"clients which include investment companies, other investment advisers, institutional separate accounts and retail separate accounts (collectively referred to herein as Managed Portfolios)"
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 1)
GLAUKOS CORP
(Name of Issuer)
Common Stock
(Title of Class of Securities)
377322102
(CUSIP Number)
03/31/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
377322102
1
Names of Reporting Persons
JANUS HENDERSON GROUP PLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
JERSEY
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,348,395.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,348,395.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,348,395.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
9.2 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
GLAUKOS CORP
(b)
Address of issuer's principal executive offices:
1 GLAUKOS WAY
ALISO VIEJO, CA 92656
Item 2.
(a)
Name of person filing:
Janus Henderson Group plc
(b)
Address or principal business office or, if none, residence:
201 Bishopsgate
EC2M 3AE, United Kingdom
(c)
Citizenship:
Y9
(d)
Title of class of securities:
Common Stock
(e)
CUSIP No.:
377322102
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
Janus Henderson Group plc (JHG) is the ultimate parent of a number of SEC-registered investment advisers and foreign equivalents thereof, including but not limited to Janus Henderson Investors US LLC, Janus Henderson Investors UK Limited, Janus Henderson Investors Australia Institutional Funds Management Limited, Janus Henderson Investors Middle East Limited, Janus Henderson Investors (Jersey) Limited, Janus Henderson Investors (Japan) Limited, Janus Henderson Investors (Singapore) Limited, Kapstream Capital Pty Limited, Privacore Capital Advisors LLC, Tabula Investment Management Limited, and Victory Park Capital Advisors LLC (each, an Asset Manager and together, the Asset Managers). The Asset Managers generally exercise investment and/or voting discretion on behalf of their clients which include investment companies, other investment advisers, institutional separate accounts and retail separate accounts (collectively referred to herein as Managed Portfolios).
As a result of their exercise of investment and/or voting discretion on behalf of the Managed Portfolios, the Asset Managers may be deemed to be the beneficial owner of 5,348,395 common stock of Glaukos Corp. However, the Asset Managers do not have the right to receive any dividends from, or the proceeds from the sale of, the securities held in the Managed Portfolios and disclaim any ownership associated with such rights.
(b)
Percent of class:
9.2 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
0
(ii) Shared power to vote or to direct the vote:
5348395
(iii) Sole power to dispose or to direct the disposition of:
0
(iv) Shared power to dispose or to direct the disposition of:
5348395
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
The Managed Portfolios have the right to receive all dividends from, and the proceeds from the sale of, the securities held in their respective accounts.
Of the Managed Portfolios, none own more than five percent of the common stock of Glaukos Corp.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
Please refer to Exhibit 99.
Item 8.
Identification and Classification of Members of the Group.
If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group.
N/A
Item 9.
Notice of Dissolution of Group.
Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5.
N/A
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
What stake does Janus Henderson Group (GKOS) report?
Janus Henderson reports beneficial ownership of 5,348,395 shares of Glaukos common stock, representing 9.2% of the class. The shares are held through multiple Janus Henderson asset managers that exercise voting and dispositive discretion for client accounts.
Does Janus Henderson have sole voting or disposal power over GKOS shares?
No. The filing shows 0 shares with sole voting or dispositive power and 5,348,395 shares with shared voting and dispositive power, indicating collective authority across the listed asset managers rather than individual sole control.
Are dividends or sale proceeds payable to Janus Henderson for these GKOS shares?
The filing disclaims that the Asset Managers have the right to receive dividends or proceeds; the shares are held for Managed Portfolios and the managers state they do not have rights to dividends or sale proceeds from those accounts.
What does the Schedule 13G/A indicate about Janus Henderson's intent for GKOS?
This Schedule 13G/A is an amendment reporting passive beneficial ownership of 9.2%. It reflects reporting and classification of holdings by asset managers and does not itself state any intent to acquire control or change strategy.
Which entities within Janus Henderson hold the GKOS position?
The filing lists multiple asset managers (e.g., Janus Henderson Investors US LLC, Janus Henderson Investors (Jersey) Limited) as exercising discretion. Item 7 references Exhibit 99 for identification of the specific subsidiary or adviser that acquired the securities.
