Baselake discloses 5.2% Generation Bio (GBIO) holding in Schedule 13G

Rhea-AI Filing Summary

Generation Bio Co. received a new ownership disclosure from Baselake-affiliated investors. Baselake Partners, LP, Baselake Management, LLC, and individual investor David Paolella report beneficial ownership of 350,000 shares of Generation Bio common stock, representing 5.2% of the outstanding shares.

The shares are held by Baselake Partners, LP, with Baselake Management, LLC as investment manager and Paolella as managing member, giving them shared voting and dispositive power over the position. The percentage is based on 6,737,899 shares outstanding as of October 31, 2025, and the filers state the shares are not held to change or influence control of the company.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Generation Bio Co.

(Name of Issuer)

Common Stock, $0.0001 Par Value

(Title of Class of Securities)

37148K209

(CUSIP Number)

02/05/2026

(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)

SCHEDULE 13G

CUSIP No. 37148K209

1

Names of Reporting Persons

Baselake Partners, LP

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 350,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 350,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

350,000.00

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)

5.2 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: Please see note in Item 4(a)

SCHEDULE 13G

CUSIP No. 37148K209

1

Names of Reporting Persons

Baselake Management, LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 350,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 350,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

350,000.00

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)

5.2 %

12

Type of Reporting Person (See Instructions)

IA, OO

Comment for Type of Reporting Person: Please see note in Item 4(a)

SCHEDULE 13G

CUSIP No. 37148K209

1

Names of Reporting Persons

David Paolella

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 350,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 350,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

350,000.00

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)

5.2 %

12

Type of Reporting Person (See Instructions)

HC, IN

Comment for Type of Reporting Person: Please see note in Item 4(a)

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Generation Bio Co.
(b)	Address of issuer's principal executive offices: 301 Binney Street Cambridge, Massachusetts 02142
Item 2.
(a)	Name of person filing: Baselake Partners, LP* Baselake Management, LLC* David Paolella*
(b)	Address or principal business office or, if none, residence: 3155 W. Big Beaver Road, Suite 207, Troy, Michigan 48084
(c)	Citizenship: Baselake Partners, LP - Delaware Baselake Management, LLC - Delaware David Paolella - United States of America
(d)	Title of class of securities: Common Stock, $0.0001 Par Value
(e)	CUSIP No.: 37148K209
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: Baselake Partners, LP - 350,000* Baselake Management, LLC - 350,000* David Paolella - 350,000* The Common Stock (the "Shares") reported herein are held by Baselake Partners, LP (the "Fund"). Baselake Management, LLC serves as the investment manager to the Fund (the "Investment Manager"). David Paolella serves as the managing member of the Investment Manager (the "Managing Member," and collectively with the Fund and the Investment Manager, the "Reporting Persons"). By virtue of these relationships, the Reporting Persons may be deemed to have shared voting and dispositive power with respect to the Shares owned directly by the Fund. The percentages reported herein are calculated based upon a statement in the Issuer's 10-Q, indicating that there are 6,737,899 Shares issued and outstanding as of October 31, 2025. This report shall not be deemed an admission that the Reporting Persons are beneficial owners of the Shares for purposes of Section 13 of the Securities Exchange Act of 1934, as amended, or for any other purpose. Each of the Reporting Persons disclaims beneficial ownership of the Shares reported herein except to the extent of the Reporting Persons pecuniary interest therein.
(b)	Percent of class: Baselake Partners, LP - 5.2%* Baselake Management, LLC - 5.2%* David Paolella - 5.2%*
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Baselake Partners, LP - 0 Baselake Management, LLC - 0 David Paolella - 0
	(ii) Shared power to vote or to direct the vote: Baselake Partners, LP - 350,000* Baselake Management, LLC - 350,000* David Paolella - 350,000*
	(iii) Sole power to dispose or to direct the disposition of: Baselake Partners, LP - 0 Baselake Management, LLC - 0 David Paolella - 0
	(iv) Shared power to dispose or to direct the disposition of: Baselake Partners, LP - 350,000* Baselake Management, LLC - 350,000* David Paolella - 350,000*
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.
	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 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.

Baselake Partners, LP

Signature:	/s/ David Paolella
Name/Title:	David Paolella, Managing Member of Baselake Management, LLC, its investment manager
Date:	02/06/2026

Baselake Management, LLC

Signature:	/s/ David Paolella
Name/Title:	David Paolella, Managing Member
Date:	02/06/2026

David Paolella

Signature:	/s/ David Paolella
Name/Title:	Individually
Date:	02/06/2026

Exhibit Information

Exhibit I - JOINT FILING STATEMENT

FAQ

What stake in Generation Bio Co. (GBIO) does Baselake report?

Baselake-affiliated investors report beneficial ownership of 350,000 Generation Bio shares, representing 5.2% of the common stock. The filing aggregates holdings attributed to Baselake Partners, LP, Baselake Management, LLC, and David Paolella, all sharing voting and dispositive power over the same block of shares.

Who are the reporting persons in the Generation Bio (GBIO) Schedule 13G?

The Schedule 13G lists Baselake Partners, LP, Baselake Management, LLC, and David Paolella as reporting persons. Baselake Partners holds the shares, Baselake Management serves as investment manager, and Paolella is managing member, creating shared voting and dispositive authority over the position.

How did Baselake calculate its 5.2% ownership of Generation Bio (GBIO)?

The 5.2% ownership figure is based on 350,000 shares compared to 6,737,899 Generation Bio shares issued and outstanding as of October 31, 2025. That outstanding share count comes from Generation Bio’s Form 10-Q, which the reporting persons reference in the filing.

Do Baselake and David Paolella have sole or shared voting power in GBIO?

The filing reports 0 shares with sole voting power and 350,000 shares with shared voting power for each reporting person. The same 350,000-share block is shown with shared dispositive power, reflecting their roles across the fund and its investment manager structure.

Is Baselake’s Generation Bio (GBIO) position intended to influence control of the company?

The reporting persons certify the shares were not acquired and are not held to change or influence control of Generation Bio. They file on Schedule 13G and state the holdings are not in connection with any control-related transaction, apart from certain nomination activities referenced in regulations.

What ownership disclaimer do Baselake and David Paolella make in the GBIO filing?

They state the report shall not be deemed an admission that any reporting person is the beneficial owner of the shares for Section 13 purposes. Each reporting person disclaims beneficial ownership except to the extent of any pecuniary interest in the 350,000 Generation Bio shares.