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Livermore
Livermore
ZHEN

Otter Tail Corp

OTTR
Exchange
Nasdaq
Industry
Electric Services
SEC CIK
0001466593

In the last 90 days, Otter Tail Corp insiders filed 0 open-market purchases and 2 sales; 363 institutions reported holding it in 13F filings for Q2 2026, worth $2.65B in total; no superinvestor holds it.

Holders of 5% or more of OTTR

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Otter Tail Corp, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of OTTR
HolderLatest formStakeChangeFirst filedLatest filingFiling
Vanguard Portfolio Management LLC13G7.06%2.96M sharesNewApr 29, 20261 filingApr 29, 2026SEC
Vanguard Capital Management LLC13G5.19%2.18M sharesNewApr 30, 20261 filingApr 30, 2026SEC
State Street Corp13G5.10%2.15M sharesNewAug 7, 20261 filingAug 7, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

5 Schedule 13D and 13G filings on Otter Tail Corp, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on OTTR
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 7, 202610:32 AM ETState Street Corp13G5.10%2.15M sharesNewJun 30, 2026SEC
Apr 30, 202612:01 PM ETVanguard Capital Management LLC13G5.19%2.18M sharesNewMar 31, 2026SEC
Apr 29, 20262:45 PM ETVanguard Portfolio Management LLC13G7.06%2.96M sharesNewMar 31, 2026SEC
Mar 27, 202611:07 AM ETVanguard Group Inc13G/A0.00%0 shares–Below 5%Mar 13, 2026SEC
Feb 10, 2021Vanguard Group Inc13G/AOld format–––SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Otter Tail Corp shares.

No Form 144 notices for Otter Tail Corp are on file.