Mid Penn Bancorp: Bay Pond reports 1.24M shares

Bay Pond Partners, L.P. filed an amendment on a Schedule 13G/A reporting beneficial ownership of 1,244,553 shares of Mid Penn Bancorp, Inc. common stock (CUSIP 59540G107), equal to 4.91% of the class.

Rhea-AI Filing Summary

Bay Pond Partners, L.P. filed an amendment on a Schedule 13G/A reporting beneficial ownership of 1,244,553 shares of Mid Penn Bancorp, Inc. common stock (CUSIP 59540G107), equal to 4.91% of the class. The filing states Bay Pond holds shared voting and dispositive power over those shares. The signature date shown is 05/15/2026.

Key Figures

Beneficial ownership: 1,244,553 shares Percent of class: 4.91% Shared voting power: 1,244,553 shares +3 more

6 metrics

Beneficial ownership 1,244,553 shares Amount beneficially owned reported on the amendment

Percent of class 4.91% Percent of Mid Penn Bancorp common stock reported

Shared voting power 1,244,553 shares Number with shared power to vote as reported

Shared dispositive power 1,244,553 shares Number with shared power to dispose as reported

Sole voting/dispositive power 0 shares Sole voting and sole dispositive power listed as 0

Signature date 05/15/2026 Date shown with signature block on the amendment

Key Terms

Schedule 13G/A, beneficially owned, shared dispositive power, CUSIP

4 terms

Schedule 13G/A regulatory

"Amendment No. 1 ) Mid Penn Bancorp, Inc. Common Stock"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned regulatory

"Amount beneficially owned: 1,244,553"

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.

shared dispositive power regulatory

"Shared Dispositive Power 1,244,553.00"

CUSIP financial

"CUSIP No.: 59540G107"

A CUSIP is a nine-character alphanumeric code that uniquely identifies a U.S. or Canadian financial security—such as a stock, bond, or fund share—like a Social Security number for an investment. It matters to investors because brokers, exchanges and record-keepers use the CUSIP to match trades, track ownership, settle transactions and pull accurate records, reducing errors and ensuring money and securities go to the right place.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Bay Pond Partners report on Schedule 13G/A for MPB?

Bay Pond Partners reported 1,244,553 shares beneficially owned, representing 4.91% of Mid Penn Bancorp common stock. The filing notes shared voting and dispositive power over those shares and is signed on 05/15/2026.

Does the Schedule 13G/A show Bay Pond controls MPB votes?

The filing lists shared voting power of 1,244,553 shares, indicating Bay Pond shares voting influence with others. It does not claim sole voting power; sole voting and dispositive power are listed as 0 in the document.

Is Bay Pond a >5% holder of Mid Penn Bancorp (MPB)?

No; the filing reports ownership of 4.91%, which is below the 5% threshold. Item 5 explicitly states “Ownership of 5 percent or less of a class.” The reported percentage is tied to the 1,244,553 shares disclosed.

Who signed the amended Schedule 13G/A for MPB and when?

The amendment is signed by an Authorized Person for Bay Pond Partners, with the signature block showing Ihsan Speede and an accompanying reference to Wellington Alternative Investments LLC. The signature date is 05/15/2026.

What powers over the shares does Bay Pond report for MPB?

Bay Pond reports 0 sole voting and 0 sole dispositive power, and 1,244,553 shared voting and 1,244,553 shared dispositive power. Those figures appear in the Ownership section of the filing.

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

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Accepted by SEC EDGAR 05/15/2026 - 08:12 AM EDT Learn about SEC filing dates

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)

03/31/2026

(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): 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 1,244,553.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,244,553.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,244,553.00

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)

4.9 %

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: 1,244,553
(b)	Percent of class: 4.91 %
(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: 1,244,553
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,244,553
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:	05/15/2026

Comments accompanying signature: Wellington Alternative Investments LLC; Its General Partner Signature: Ihsan Speede Name/Title: Authorized Person Date: 05/15/2026