Amended Schedule 13G: Bay Pond Holds 1,027,665 MPB Shares (4.48%)

Rhea-AI Filing Summary

Mid Penn Bancorp, Inc. is reported in this amended Schedule 13G by Bay Pond Partners, L.P. The filing discloses beneficial ownership of 1,027,665 shares of the issuer's common stock (CUSIP 59540G107), representing 4.48% of the class as of the event date 06/30/2025. The reporting person is organized in Delaware and lists its principal business address c/o Wellington Management Company LLP, 280 Congress Street, Boston MA 02210.

The statement shows no sole voting or dispositive power and shared voting and dispositive power over the reported shares (1,027,665). The document is identified as Amendment No. 1 and includes a certification that the securities were not acquired to change or influence control. The signature block names Ihsan Speede as Authorized Person with a signature date of 08/12/2025.

Insights

Financial Analyst

TL;DR: Routine disclosure of a sub-5% passive stake; limited direct governance impact.

The amended Schedule 13G shows Bay Pond Partners, L.P. holds 1,027,665 shares (4.48%) of Mid Penn Bancorp common stock with shared voting and dispositive power only. Because the position is below 5% and the filing is a Schedule 13G amendment (type code PN), this appears to be a passive disclosure rather than an active control intent. The ownership level is large enough to be noted by investors but does not meet common thresholds for triggering activist or control concerns based solely on this filing.

Corporate Governance Expert

TL;DR: Disclosure provides transparency; no sole control and certification against control intent.

The filing explicitly states 0 sole voting power and 1,027,665 shared voting power, and includes a certification that the shares were not acquired to influence control. As an amended Schedule 13G with a signature dated 08/12/2025, it documents an ownership stake while signaling passive status. From a governance perspective, this does not, on its face, change board control dynamics or require governance action given the sub-5% stake and the reporting posture.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Mid Penn Bancorp, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

59540G107

(CUSIP Number)

06/30/2025

(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. 59540G107

1

Names of Reporting Persons

Bay Pond Partners, L.P.

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 1,027,665.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,027,665.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,027,665.00

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)

4.5 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Mid Penn Bancorp, Inc.
(b)	Address of issuer's principal executive offices: 2407 Park Drive, Harrisburg PA 17110
Item 2.
(a)	Name of person filing: Bay Pond Partners, L.P.
(b)	Address or principal business office or, if none, residence: c/o Wellington Management Company LLP, 280 Congress Street, Boston MA 02210
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 59540G107
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: 1,027,665
(b)	Percent of class: 4.48 %
(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: 1,027,665
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,027,665
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 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.

Bay Pond Partners, L.P.

Signature:	Ihsan Speede
Name/Title:	Authorized Person
Date:	08/12/2025

Comments accompanying signature: Wellington Alternative Investments LLC; Its General Partner Signature: Ihsan Speede Name/Title: Authorized Person Date: 08/12/2025

FAQ

What stake does Bay Pond Partners report in Mid Penn Bancorp (MPB)?

The filing reports 1,027,665 shares, equal to 4.48% of Mid Penn Bancorp's common stock (CUSIP 59540G107).

Does Bay Pond Partners have sole voting or dispositive power over MPB shares?

No. The filing shows 0 sole voting power and 0 sole dispositive power; it reports shared voting and shared dispositive power for 1,027,665 shares.

What type of filing is this and was it amended?

This is an amended Schedule 13G (Amendment No. 1) filed for Mid Penn Bancorp, indicating a passive reporting posture (type code PN appears in the filing).

What dates are relevant in the filing?

The event date requiring the filing is 06/30/2025, and the signature on the amendment is dated 08/12/2025.

Who filed the Schedule 13G on behalf of Bay Pond Partners?

The filing lists the reporting person as Bay Pond Partners, L.P. with an address c/o Wellington Management Company LLP, 280 Congress Street, Boston MA 02210, and the signature is by Ihsan Speede, Authorized Person.