State Street Corporation (RARE) discloses 6.3% Ultragenyx ownership on Schedule 13G

Rhea-AI Filing Summary

State Street Corporation reported beneficial ownership of 6,158,766 shares of Ultragenyx Pharmaceutical Inc. common stock on a Schedule 13G. This represents 6.3% of the class.

State Street reports 0 shares with sole voting or dispositive power, and 5,871,222 shares with shared voting power and 6,158,766 shares with shared dispositive power through its investment management subsidiaries.

Key Figures

Shares beneficially owned: 6,158,766 shares Percent of class: 6.3% Shared voting power: 5,871,222 shares +2 more

5 metrics

Shares beneficially owned 6,158,766 shares Ultragenyx common stock beneficially owned by State Street Corporation

Percent of class 6.3% Portion of Ultragenyx common stock class held by State Street Corporation

Shared voting power 5,871,222 shares Ultragenyx shares over which State Street has shared voting power

Shared dispositive power 6,158,766 shares Ultragenyx shares over which State Street has shared dispositive power

Sole voting power 0 shares Ultragenyx shares over which State Street has sole voting power

Key Terms

beneficially owned, Sole power to vote or to direct the vote, Shared power to dispose or to direct the disposition of, Schedule 13G, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 6158766.00"

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.

Sole power to vote or to direct the vote financial

"(i) Sole power to vote or to direct the vote: 0"

Shared power to dispose or to direct the disposition of financial

"(iv) Shared power to dispose or to direct the disposition of: 6,158,766"

Schedule 13G regulatory

"If a parent holding company has filed this schedule, pursuant to (ii)(G), so indicate"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Investment Company Act of 1940 regulatory

"shareholders of an investment company registered under the Investment Company Act of 1940"

A U.S. federal law that sets the rulebook for pooled investment vehicles such as mutual funds, exchange-traded funds and similar money managers, requiring them to register with regulators, disclose holdings and fees, limit conflicts of interest, and follow governance standards. It matters to investors because these protections and transparency rules act like a referee and scoreboard, helping people compare funds, trust that managers follow fair practices, and spot hidden costs or risks.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/07/2026 - 11:06 AM Accepted by SEC EDGAR 08/07/2026 - 11:05 AM Learn about SEC filing dates

FAQ

How many Ultragenyx (RARE) shares does State Street Corporation report owning?

State Street Corporation reports beneficial ownership of 6,158,766 Ultragenyx common shares. This position is disclosed on a Schedule 13G filing and reflects shares held through various State Street investment management subsidiaries.

What percentage of Ultragenyx (RARE) does State Street Corporation hold?

State Street Corporation reports holding 6.3% of Ultragenyx’s common stock. This percentage is based on the company’s outstanding common shares and is stated directly in the ownership section of the Schedule 13G filing.

Does State Street have sole or shared voting power over its Ultragenyx (RARE) shares?

State Street reports 0 shares with sole voting power and 5,871,222 shares with shared voting power. Voting authority is therefore shared, primarily through its asset management entities rather than held with exclusive control.

What is State Street’s dispositive power over Ultragenyx (RARE) shares?

State Street reports 0 shares with sole dispositive power and 6,158,766 shares with shared dispositive power. This means decisions to dispose of these shares are made on a shared basis, typically by affiliated investment managers.

Which State Street subsidiaries are involved in the Ultragenyx (RARE) holdings?

The filing lists SSGA Funds Management, Inc., State Street Global Advisors Europe Limited, State Street Global Advisors Limited, State Street Global Advisors Trust Company, and State Street Global Advisors, Ltd. as relevant investment adviser subsidiaries.

Who signed the Schedule 13G for State Street’s Ultragenyx (RARE) position?

The Schedule 13G is signed by Elizabeth Schaefer, identified as Senior Vice President, Chief Accounting Officer, on 08/07/2026, acting on behalf of State Street Corporation in reporting the ownership stake.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

ULTRAGENYX PHARMACEUTICAL INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

90400D108

(CUSIP Number)

06/30/2026

(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): 90400D108

1

Names of Reporting Persons

STATE STREET CORPORATION

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

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 5,871,222.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 6,158,766.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,158,766.00

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)

6.3 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ULTRAGENYX PHARMACEUTICAL INC
(b)	Address of issuer's principal executive offices: 60 LEVERONI COURT, NOVATO, CALIFORNIA, 94949
Item 2.
(a)	Name of person filing: STATE STREET CORPORATION;
(b)	Address or principal business office or, if none, residence: ONE CONGRESS STREET, SUITE 1, BOSTON MA 02114, UNITED STATES
(c)	Citizenship: MA
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP Number(s): 90400D108
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: 6158766.00
(b)	Percent of class: 6.3 %
(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: 5,871,222
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 6,158,766
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. NOT APPLICABLE
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. SSGA FUNDS MANAGEMENT, INC. (IA);STATE STREET GLOBAL ADVISORS EUROPE LIMITED (IA);STATE STREET GLOBAL ADVISORS LIMITED (IA);STATE STREET GLOBAL ADVISORS TRUST COMPANY (IA);STATE STREET GLOBAL ADVISORS, LTD. (IA);
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. NOT APPLICABLE
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. NOT APPLICABLE

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.

STATE STREET CORPORATION

Signature:	ELIZABETH SCHAEFER
Name/Title:	SENIOR VICE PRESIDENT, CHIEF ACCOUNTING OFFICER
Date:	08/07/2026