Vanguard disaggregates holdings; reports 0% in Otter Tail (OTTR)

Rhea-AI Filing Summary

Otter Tail Corp (OTTR) Schedule 13G/A amendment filed by The Vanguard Group reports 0 shares beneficially owned and 0% of the class. The filing states Vanguard completed an internal realignment on January 12, 2026 and certain subsidiaries will report disaggregated holdings per SEC Release No. 34-39538 (January 12, 1998).

The filing is signed by Ashley Grim on 03/27/2026 and indicates Vanguard and its managed accounts retain rights to dividends or proceeds for reported securities where applicable.

Insights

Institutional Ownership Analyst

Vanguard’s amendment disaggregates holdings and reports no beneficial ownership in OTTR.

The filing lists Amount beneficially owned: 0 and Percent of class: 0% as the primary facts. It explains an internal realignment effective January 12, 2026, citing SEC Release No. 34-39538 (January 12, 1998) as the legal basis for separate reporting by subsidiaries.

Practical dependencies include subsequent filings by Vanguard’s subsidiaries that may show holdings; cash-flow treatment and any per-entity share counts are not included in this excerpt, so follow-up schedules could provide further detail.

Compliance & Reporting Specialist

Amendment clarifies reporting posture rather than economic change.

The amendment focuses on reporting structure: it states certain subsidiaries will report separately and that The Vanguard Group, Inc. "no longer has, or is deemed to have, beneficial ownership" of those subsidiary-owned securities per the cited SEC release. The filing shows governance of reporting, not a trade.

Watch for additional 13G/A entries from Vanguard affiliates that could list positive share counts; this filing itself records 0 beneficial shares for the named filer.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 14)

Otter Tail Corp

(Name of Issuer)

Common Stock

(Title of Class of Securities)

689648103

(CUSIP Number)

03/13/2026

(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): 689648103

1

Names of Reporting Persons

The Vanguard Group

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 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: On January 12, 2026, The Vanguard Group, Inc. went through an internal realignment. In accordance with SEC Release No. 34-39538 (January 12, 1998), certain subsidiaries or business divisions of subsidiaries of The Vanguard Group, Inc., that formerly had, or were deemed to have, beneficial ownership with The Vanguard Group, Inc., will report beneficial ownership separately (on a disaggregated basis) from The Vanguard Group, Inc. in reliance on such release. These subsidiaries and/or business divisions pursue the same investment strategies as previously pursued by The Vanguard Group, Inc. prior to the realignment. Further in accordance with SEC Release No. 34-39538 (January 12, 1998), The Vanguard Group, Inc. no longer has, or is deemed to have, beneficial ownership over securities beneficially owned by such subsidiaries and/or business divisions.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Otter Tail Corp
(b)	Address of issuer's principal executive offices: 215 South Cascade Street, PO Box 496, Fergus Falls, MN, 56538
Item 2.
(a)	Name of person filing: The Vanguard Group
(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 No.:
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: 0
(b)	Percent of class: 0 %
(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: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
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.
	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. The Vanguard Group, 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.

The Vanguard Group

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	03/27/2026

FAQ

What does Vanguard report for OTTR (Otter Tail Corp) in this 13G/A amendment?

The filing states 0 shares beneficially owned and 0% of the class. It explains an internal realignment on January 12, 2026 and that certain subsidiaries will report holdings separately under SEC Release No. 34-39538.

Does this filing show Vanguard sold or bought OTTR shares?

No; the amendment reports 0 shares beneficially owned and does not describe purchases or sales. It documents a reporting realignment where affiliated subsidiaries will report separately, rather than an explicit transaction by Vanguard in OTTR.

Why does Vanguard reference SEC Release No. 34-39538 in the amendment?

Vanguard cites SEC Release No. 34-39538 (January 12, 1998) to justify disaggregated reporting by subsidiaries. The filing states those subsidiaries will report beneficial ownership separately following an internal realignment on January 12, 2026.

Who signed the Schedule 13G/A amendment for OTTR and when?

The filing is signed by Ashley Grim, Head of Global Fund Administration, with signature date 03/27/2026. The document lists The Vanguard Group as the filer and Otter Tail Corp as the issuer.

Will other Vanguard entities report OTTR holdings after this amendment?

The amendment states certain Vanguard subsidiaries or business divisions will report beneficial ownership separately following the internal realignment. Subsequent 13G/A or similar schedules from those entities may disclose holdings; this excerpt does not list those subsidiary amounts.