Otter Tail Corporation

OTTR·NASDAQ·$88.30Share Price as of 11/2·$4BMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/05/26 10-QQ1 ended 03/31/2605/06/26 10-K/AFY 202502/23/26 10-KFY 202502/18/26 10-QQ3 ended 09/30/2511/05/25

Disclosures

8-KCurrent report09/01/26 8-KCurrent report08/04/26 8-KCurrent report06/18/26 8-KCurrent report06/05/26 8-KCurrent report05/29/26

Prospectuses and Registrations

S-3ASRAutomatic shelf registration05/03/24 S-3ASRAutomatic shelf registration05/03/24 S-8Registration of securities for employees04/17/23 S-3ASRAutomatic shelf registration05/03/21 S-3ASRAutomatic shelf registration05/03/21

Proxies

DEF 14ADefinitive proxy03/02/26 DEFA14AAdditional proxy materials03/02/26 PRE 14APreliminary proxy02/18/26 DEF 14ADefinitive proxy03/03/25 DEFA14AAdditional proxy materials03/03/25

Ownership

Form 4Insider transaction08/12/26 Form 4Insider transaction08/11/26 144Proposed sale of securities08/07/26 SC 13GBeneficial ownership08/07/26 SC 13GBeneficial ownership04/30/26

Other

SDConflict Minerals disclosure05/29/26 ARSAnnual report to shareholders03/02/26 SDConflict Minerals disclosure05/30/25 ARSAnnual report to shareholders03/03/25 SDConflict Minerals disclosure05/24/24