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OTTR · Otter Tail Corp

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Market Cap
$3.75B
Shares
41.99M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 363
Total Value: $2,649,582,051
Total Shares: 29,446,347
Showing 1–100 of 366 holdings by value · page 1 of 4

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 363 13F filers · Δ vs Mar 31, 2026
Top Holder
22.3%
Sep 2023 → Jun 2026 · range 22.0% – 26.5%
+0.3 pts
Top 5
48.5%
Sep 2023 → Jun 2026 · range 47.4% – 62.3%
+1.1 pts
Top 10
62.7%
Sep 2023 → Jun 2026 · range 60.3% – 73.7%
+2.4 pts
HHI
758
Sep 2023 → Jun 2026 · range 733 – 1,268
Broadly held+26

Quarterly Activity

vs Mar 31, 2026
New
48
Increased
143
Decreased
103
Sold Out
32
Unchanged
69
Holder count: +16
Institutional value: +3.2%
Shares held: +0.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 366
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1466593 CUSIP 689648103 13F (30d) 248 filings 233 filers Visit website Investor relations