Janus Henderson discloses 6.2% Jade Biosciences (JBIO) position

Rhea-AI Filing Summary

Janus Henderson Group plc filed a Schedule 13G reporting a passive ownership stake in Jade Biosciences, Inc. common stock. Through its investment adviser subsidiaries managing various client accounts, it is deemed the beneficial owner of 3,063,457 shares, representing 6.2% of the class.

These shares are held with shared voting and dispositive power, while Janus Henderson’s asset managers exercise investment and voting discretion for client portfolios. The managed portfolios retain rights to dividends and sale proceeds. Janus Henderson certifies the holdings are in the ordinary course of business and not intended to change or influence control of Jade Biosciences.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

JADE BIOSCIENCES, INC.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

008064206

(CUSIP Number)

12/31/2025

(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)

SCHEDULE 13G

CUSIP No. 008064206

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 3,063,457.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,063,457.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,063,457.00

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)

6.2 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: JADE BIOSCIENCES, INC.
(b)	Address of issuer's principal executive offices: 221 CRESCENT ST., BUILDING 23, SUITE 105 WALTHAM, MA 02453
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.: 008064206
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 3,063,457 common stock of jADE bIOSCIENCES, Inc. 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: 6.2 %
(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: 3063457
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 3063457
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, only the Janus Henderson Biotech Innovation Master Fund Ltd. has the right to receive dividends from, or the proceeds from the sale of, more than five percent of the common stock of Jade Biosciences, Inc. Due to an irrevocable delegation of investment and voting discretion to an Asset Manager on less than 60 days notice, the Fund is not considered a Reporting Person under Section 13(d) and (g).
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)(K), so indicate under Item 3(k) 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.

JANUS HENDERSON GROUP PLC

Signature:	Kristin Mariani
Name/Title:	Head of North America Compliance
Date:	02/17/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7

FAQ

What did Janus Henderson disclose about Jade Biosciences (JBIO)?

Janus Henderson Group plc disclosed a passive institutional stake in Jade Biosciences common stock. It filed a Schedule 13G indicating beneficial ownership through its investment adviser subsidiaries that manage client portfolios, rather than direct proprietary holdings on its own balance sheet.

How large is Janus Henderson’s ownership stake in JBIO?

Janus Henderson is deemed to beneficially own 3,063,457 Jade Biosciences common shares, representing 6.2% of the outstanding class. This ownership arises from discretionary authority exercised by its asset manager subsidiaries over multiple managed portfolios holding the issuer’s stock.

What voting and dispositive powers does Janus Henderson report over JBIO shares?

Janus Henderson reports shared voting power and shared dispositive power over 3,063,457 Jade Biosciences shares, with no sole voting or dispositive authority. Its asset manager subsidiaries exercise investment and/or voting discretion for the underlying managed client accounts holding these securities.

Who receives dividends and sale proceeds from the JBIO shares?

The managed portfolios receive all dividends and sale proceeds from the Jade Biosciences shares. Janus Henderson’s asset managers disclaim ownership of these economic rights, stating that the rights belong to the underlying client accounts, including funds and separate accounts they manage.

Is Janus Henderson’s JBIO position an activist or passive holding?

The position is described as passive. Janus Henderson certifies the securities were acquired and are held in the ordinary course of business and not for the purpose, or with the effect, of changing or influencing control of Jade Biosciences as the issuer.

Which Janus Henderson portfolios hold over 5% of JBIO’s stock?

Among the managed portfolios, only Janus Henderson Biotech Innovation Master Fund Ltd has rights to dividends or sale proceeds exceeding five percent of Jade Biosciences common stock. Due to an irrevocable delegation of investment and voting discretion, that fund itself is not treated as a reporting person.