Company · Ownership research

Otter Tail Corp OTTR

CIK 0001466593 · CUSIP 689648103

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

This page lists the top 20 of 347 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$563.87M 6,424,374 shares	0.01%	+32.93K(+0.50%)Added	SEC filing ↗ May 13, 2026	▾
02	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$258.67M 2,947,184 shares	0.01%	—	SEC filing ↗ May 8, 2026	▾
03	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$163.75M 1,865,713 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
04	STATE STREET CORP CIK 93751 · View history	$137.74M 1,569,348 shares	0.00%	+7.91K(+0.50%)Added	SEC filing ↗ May 15, 2026	▾
05	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$92.61M 1,054,887 shares	0.01%	+35.63K(+3.50%)Added	SEC filing ↗ May 15, 2026	▾
06	LSV ASSET MANAGEMENT CIK 1050470 · View history	$91.54M 1,042,913 shares	0.20%	+505.97K(+94.20%)Added	SEC filing ↗ May 11, 2026	▾
07	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$71.55M 815,241 shares	0.01%	-35.49K(-4.20%)Reduced	SEC filing ↗ May 7, 2026	▾
08	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$58.19M 662,934 shares	0.05%	+391.28K(+144.00%)Added	SEC filing ↗ May 15, 2026	▾
09	MORGAN STANLEY CIK 895421 · View history	$57.44M 654,434 shares	0.00%	+92.14K(+16.40%)Added	SEC filing ↗ May 15, 2026	▾
10	FIRST TRUST ADVISORS LP CIK 1125816 · View history	$53.23M 606,504 shares	0.04%	-204.13K(-25.20%)Reduced	SEC filing ↗ May 13, 2026	▾
11	Caisse de depot et placement du Quebec CIK 898286 · View history	$50.02M 569,933 shares	0.08%	+15.20K(+2.70%)Added	SEC filing ↗ May 14, 2026	▾
12	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$46.00M 524,121 shares	0.01%	-8.57K(-1.60%)Reduced	SEC filing ↗ May 15, 2026	▾
13	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$42.60M 485,351 shares	0.01%	+156.19K(+47.50%)Added	SEC filing ↗ May 15, 2026	▾
14	GABELLI FUNDS LLC CIK 1081407 · View history	$41.01M 467,200 shares	0.28%	-1.90K(-0.40%)Reduced	SEC filing ↗ May 14, 2026	▾
15	NORTHERN TRUST CORP CIK 73124 · View history	$37.92M 432,012 shares	0.01%	+17.23K(+4.20%)Added	SEC filing ↗ May 14, 2026	▾
16	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$35.06M 399,426 shares	0.03%	+151.19K(+60.90%)Added	SEC filing ↗ May 15, 2026	▾
17	Bank of New York Mellon Corp CIK 1390777 · View history	$30.77M 350,608 shares	0.01%	-7.97K(-2.20%)Reduced	SEC filing ↗ May 5, 2026	▾
18	ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 1165408 · View history	$30.02M 342,000 shares	0.05%	-2.15K(-0.60%)Reduced	SEC filing ↗ May 15, 2026	▾
19	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$29.53M 336,483 shares	0.00%	+11.36K(+3.50%)Added	SEC filing ↗ May 18, 2026	▾
20	JPMORGAN CHASE & CO CIK 19617 · Amended · View history	$29.12M 339,633 shares	0.00%	-79.30K(-18.90%)Reduced	SEC filing ↗ May 13, 2026	▾

Showing 20 / 347 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

347

Cancelled or null records excluded

Disclosed shares

29,243,048

Not deduplicated across managers

Disclosed value

$2.57B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Otter Tail Corp · Q1 2026

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.