Vanguard Capital Management reports 5% Repligen (RGEN) stake in Schedule 13G

Rhea-AI Filing Summary

Vanguard Capital Management reports beneficial ownership of 2,825,579 shares of Repligen Corp common stock, representing 5% of the class. Vanguard has sole voting power over 414,408 shares and sole dispositive power over all 2,825,579 shares, with no shared voting or dispositive power.

The filing explains that these securities are held across Vanguard Capital Management LLC and several affiliated entities and business divisions, including various Vanguard funds and managed accounts. Vanguard and its registered investment companies and other accounts have the right to receive dividends and sale proceeds, but no other single person has an interest in more than 5% of the securities reported.

Key Figures

Beneficially owned shares: 2,825,579 shares Percent of class: 5% Sole voting power: 414,408 shares +3 more

6 metrics

Beneficially owned shares 2,825,579 shares Repligen common stock reported by Vanguard Capital Management as beneficially owned

Percent of class 5% Portion of Repligen common stock class beneficially owned by Vanguard Capital Management

Sole voting power 414,408 shares Repligen shares over which Vanguard Capital Management has sole power to vote

Shared voting power 0 shares Repligen shares over which Vanguard Capital Management has shared voting power

Sole dispositive power 2,825,579 shares Repligen shares over which Vanguard Capital Management has sole dispositive power

Shared dispositive power 0 shares Repligen shares over which Vanguard Capital Management has shared dispositive power

Key Terms

beneficially owned, sole dispositive power, sole voting power, Schedule 13G, +1 more

5 terms

beneficially owned financial

"this reflects the securities beneficially owned, or deemed to be beneficially owned"

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 dispositive power financial

"Sole Dispositive Power 2,825,579.00"

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.

sole voting power financial

"Sole Voting Power 414,408.00"

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.

Schedule 13G regulatory

"In accordance with SEC Release No. 34-39538 ... reported herein"

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.

percent of class financial

"Percent of class: 5 %"

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.

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

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FAQ

What percentage of Repligen (RGEN) does Vanguard Capital Management report owning?

Vanguard Capital Management reports beneficial ownership of 5% of Repligen’s common stock. This 5% interest is based on 2,825,579 shares held across Vanguard entities, funds, and managed accounts as detailed in the Schedule 13G filing.

How many Repligen (RGEN) shares does Vanguard Capital Management beneficially own?

Vanguard Capital Management beneficially owns 2,825,579 shares of Repligen common stock. These holdings are aggregated across Vanguard Capital Management LLC, affiliated entities, and various Vanguard funds and managed accounts exercising dispositive and/or voting power.

What voting power does Vanguard Capital Management have over Repligen (RGEN) shares?

Vanguard Capital Management has sole voting power over 414,408 shares of Repligen and no shared voting power. It retains sole discretion to vote these shares, while the remaining reported shares are held with dispositive power but without stated voting authority.

What dispositive power does Vanguard Capital Management report for Repligen (RGEN) stock?

Vanguard Capital Management reports sole dispositive power over 2,825,579 shares of Repligen and no shared dispositive power. Sole dispositive power means Vanguard can decide how and when to sell or otherwise dispose of these shares.

Do other investors share in the 5% Repligen (RGEN) stake reported by Vanguard?

Vanguard states that no other single person has an interest in more than 5% of the securities reported. Dividends and sale proceeds belong to Vanguard investment companies and other managed accounts, but no individual holder exceeds that threshold.

Who signed the Repligen (RGEN) Schedule 13G on behalf of Vanguard Capital Management?

The Schedule 13G was signed by My Trieu-Gatt, identified as Authorized Signatory, Head of Global Fund Administration. This signature confirms the accuracy of the reported Repligen ownership interests for Vanguard Capital Management and its affiliates.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

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

Vanguard Capital Management

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

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 414,408.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,825,579.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,825,579.00

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)

5 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Capital Management LLC and the following affiliates of Vanguard Capital Management LLC or business divisions of such affiliates: Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Capital Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Capital Management LLC, or business divisions of such subsidiaries, whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

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: Vanguard Capital Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 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: 2825579
(b)	Percent of class: 5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 414408
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 2825579
	(iv) Shared power to dispose or to direct the disposition of: 0
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. Vanguard Capital Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
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.

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.

Vanguard Capital Management

Signature:	My Trieu-Gatt
Name/Title:	Authorized Signatory, Head of Global Fund Administration
Date:	07/31/2026