Repligen Corp (RGEN) stake at 3.1% in new T. Rowe Price 13G/A

Rhea-AI Filing Summary

T. Rowe Price Associates, Inc. filed an amended ownership report for Repligen Corp. (common stock), stating beneficial ownership of 1,751,887 shares of common stock, representing 3.1% of the class as of 06/30/2026. The firm reports sole voting power over 1,744,549 shares and sole dispositive power over 1,751,887 shares, with no shared voting or dispositive power. The filer notes that this reflects ownership of 5 percent or less of the class and expressly denies that the filing should be construed as an admission of beneficial ownership beyond what is required to be reported.

Key Figures

Shares beneficially owned: 1,751,887 shares Percent of class: 3.1 % Sole voting power: 1,744,549 shares +3 more

6 metrics

Shares beneficially owned 1,751,887 shares Repligen common stock beneficially owned by T. Rowe Price Associates

Percent of class 3.1 % Portion of Repligen common stock class held by T. Rowe Price Associates

Sole voting power 1,744,549 shares Shares of Repligen over which T. Rowe Price has sole voting power

Sole dispositive power 1,751,887 shares Shares of Repligen over which T. Rowe Price has sole dispositive power

Shared voting power 0 Shares of Repligen with shared voting power reported

Shared dispositive power 0 Shares of Repligen with shared dispositive power reported

Key Terms

beneficially owned, sole voting power, sole dispositive power, percent of class, +1 more

5 terms

beneficially owned financial

"Amount beneficially owned: 1751887 (b) | Percent of class: 3.1 %"

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 voting power financial

"Sole Voting Power 1,744,549.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole Dispositive Power 1,751,887.00 8 | Shared Dispositive Power 0.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

percent of class financial

"Percent of class: 3.1 % (c) | Number of shares as to which"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

Ownership of 5 percent or less of a class financial

"Item 5. | Ownership of 5 Percent or Less of a Class."

FAQ

What percentage of Repligen Corp (RGEN) does T. Rowe Price Associates currently report owning?

T. Rowe Price Associates reports beneficial ownership of 3.1% of Repligen Corp’s common stock. This corresponds to 1,751,887 shares as stated in the Schedule 13G/A amendment for the period including 06/30/2026.

How many Repligen (RGEN) shares does T. Rowe Price Associates report as beneficially owned?

T. Rowe Price Associates reports beneficial ownership of 1,751,887 shares of Repligen common stock. This stake represents 3.1% of the class, according to the amended Schedule 13G/A filing.

What voting power does T. Rowe Price Associates have over its Repligen (RGEN) shares?

T. Rowe Price Associates reports sole voting power over 1,744,549 shares of Repligen and no shared voting power. It also reports sole dispositive power over 1,751,887 shares, with no shared dispositive power.

Does T. Rowe Price Associates claim more than 5% ownership of Repligen (RGEN)?

No. The filing states ownership of 5 percent or less of a class and reports a 3.1% stake in Repligen common stock. The filer also expressly denies broader beneficial ownership beyond what is reported.

Where is T. Rowe Price Associates, the Repligen (RGEN) shareholder, organized and based?

T. Rowe Price Associates is organized in Maryland and lists its principal business office as 1307 Point Street, Baltimore, MD 21231. It reports holdings in Repligen’s common stock under this Schedule 13G/A.

What type of Repligen (RGEN) security does T. Rowe Price Associates hold?

T. Rowe Price Associates reports holdings in Repligen’s COMMON STOCK, identified by CUSIP 759916109. The position totals 1,751,887 shares, representing 3.1% of the outstanding class as disclosed.

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Available on EDGAR 08/14/2026 - 10:39 AM Accepted by SEC EDGAR 08/14/2026 - 10:38 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 8)

REPLIGEN CORP

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

759916109

(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): 759916109

1

Names of Reporting Persons

T. Rowe Price Associates, Inc.

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

MARYLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,744,549.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,751,887.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,751,887.00

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)

3.1 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: REPLIGEN CORP
(b)	Address of issuer's principal executive offices: 41 SEYON STREET, BUILDING 1, SUITE 100, WALTHAM, MA, 02453
Item 2.
(a)	Name of person filing: T. Rowe Price Associates, Inc.
(b)	Address or principal business office or, if none, residence: 1307 Point Street, Baltimore, MD 21231
(c)	Citizenship: Maryland
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 759916109
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: 1751887
(b)	Percent of class: 3.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1744549
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1751887
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	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.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	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. T. Rowe Price Associates, Inc. hereby declares and affirms that the filing of Schedule 13G shall not be construed as an admission that Price Associates is the beneficial owner of the securities referred to, which beneficial ownership is expressly denied.

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.

T. Rowe Price Associates, Inc.

Signature:	Ellen York
Name/Title:	Vice President
Date:	08/14/2026