Schedule 13G: Bay Pond Partners Reports 1.16M Shares (5.05%) of MPB

Rhea-AI Filing Summary

Bay Pond Partners, L.P. reports beneficial ownership of 1,160,843 shares of Mid Penn Bancorp, Inc. common stock, representing 5.05% of the class. The filing states all reported shares are held with shared voting and shared dispositive power and no sole voting or dispositive power is claimed.

The Schedule 13G indicates the holdings are not for the purpose of changing or influencing control of the issuer. The filing lists Mid Penn Bancorp's principal office at 2407 Park Drive, Harrisburg, PA and was signed by an authorized person on 09/26/2025.

Positive

• Disclosure of a >5% stake (1,160,843 shares, 5.05%) provides transparency to the market
• Filed as Schedule 13G, indicating the filer represents the position as passive and not seeking control

Negative

• None.

Insights

Financial Analyst

TL;DR: A passive investor disclosed a just-above-5% stake, a disclosure threshold that can attract investor attention without signaling control intent.

The filing shows Bay Pond Partners, L.P. holds 1,160,843 shares (5.05%) with shared voting and dispositive power. Because this is a Schedule 13G rather than a 13D, the filer represents the position as passive and not intended to change control. For investors, the key takeaway is the emergence of a >5% shareholder which may increase monitoring but does not imply activist intent per the filer’s certification.

Corporate Governance Expert

TL;DR: Disclosure of a >5% stake triggers governance visibility but the filer certifies passive intent, limiting immediate governance implications.

Bay Pond Partners’ classification as a passive holder

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Mid Penn Bancorp, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

59540G107

(CUSIP Number)

09/22/2025

(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 1,160,843.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,160,843.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,160,843.00

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)

5.0 %

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: 1,160,843
(b)	Percent of class: 5.05 %
(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: 1,160,843
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,160,843
Item 5.	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:	09/26/2025

Comments accompanying signature: Wellington Alternative Investments LLC; Its General Partner Signature: Ihsan Speede Name/Title: Authorized Person Date: 09/26/2025

FAQ

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

Bay Pond Partners reports beneficial ownership of 1,160,843 shares, equal to 5.05% of Mid Penn Bancorp common stock.

Does the filing indicate Bay Pond Partners intends to influence control of MPB?

No. The Schedule 13G includes a certification that the securities were not acquired and are not held for the purpose of changing or influencing control.

What voting and dispositive powers are reported by the filer?

The filer reports 0 shares with sole voting or dispositive power and 1,160,843 shares with shared voting and shared dispositive power.

When was the Schedule 13G signed and filed?

The signature on the filing is dated 09/26/2025 and the event date listed is 09/22/2025.

Where is Mid Penn Bancorp's principal executive office listed?

The filing lists the issuer's principal executive offices at 2407 Park Drive, Harrisburg, PA 17110.