Otter Tail Corp

Annual Report for period ending 2023-12-31

Quarterly Report for period ending 2023-09-30

Quarterly Report for period ending 2023-06-30

Quarterly Report for period ending 2023-03-31

Annual Report for period ending 2022-12-31

Quarterly Report for period ending 2022-09-30

Quarterly Report for period ending 2022-06-30

Quarterly Report for period ending 2022-03-31

Annual Report for period ending 2021-12-31

Quarterly Report for period ending 2021-09-30

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Filing for proposed sale of securities under Rule 144

Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1)

Annual report to security holders

Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1)

Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1)

Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1)

Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1)

Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1)

Order Granting Confidential Treatment

Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1)

VANGUARD GROUP INC: Major Shareholders

KNUTSON PAUL L: Statement of changes in beneficial ownership of securities

Abbott John S: Statement of changes in beneficial ownership of securities

Wahlund Todd R: Statement of changes in beneficial ownership of securities

ROGELSTAD TIMOTHY J: Statement of changes in beneficial ownership of securities

MACFARLANE CHARLES S: Statement of changes in beneficial ownership of securities

Smestad Jennifer O.: Statement of changes in beneficial ownership of securities

PARTAIN NATHAN I: Annual statement of changes in beneficial ownership of securities

MACFARLANE CHARLES S: Annual statement of changes in beneficial ownership of securities

BlackRock Inc.: Major Shareholders

Initial registration statement for securities to be offered to employees pursuant to employee benefit plans

Automatic shelf registration statement of securities of well-known seasoned issuers

Automatic shelf registration statement of securities of well-known seasoned issuers

Prospectus filed pursuant to Rule 424(b)(5)

Automatic shelf registration statement of securities of well-known seasoned issuers

Automatic shelf registration statement of securities of well-known seasoned issuers

Automatic shelf registration statement of securities of well-known seasoned issuers

Initial registration statement for securities to be offered to employees pursuant to employee benefit plans

Automatic shelf registration statement of securities of well-known seasoned issuers

Prospectus filed pursuant to Rule 424(b)(5)

Definitive additional proxy soliciting materials including Rule 14(a)(12) material. Note: Submission type DEFA14A can be filed as part of Form 8-K. For filers subject to 8-K filing requirements, we recommend the use of the 8-K combined form type as the easiest method for fulfilling your filing requirement for both forms.

Definitive revised proxy soliciting materials

Definitive proxy statements

Definitive proxy statements

Definitive proxy statements

Preliminary proxy statement not related to a contested matter or merger/acquisition

Definitive additional proxy soliciting materials including Rule 14(a)(12) material. Note: Submission type DEFA14A can be filed as part of Form 8-K. For filers subject to 8-K filing requirements, we recommend the use of the 8-K combined form type as the easiest method for fulfilling your filing requirement for both forms.

Definitive proxy statements

Definitive proxy statements

Definitive proxy statements