Who owns NPKIWhat NPKI owns — n/a

Who owns NPK International Inc.?

Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from SEC filings.

Institutional ownership of NPKI from SEC Form 13F filings across 175 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.

As of the 2026-06-30 reporting period, 175 institutions disclosed 54.4M shares of NPK International Inc. worth $834.7M — about 64.3% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.

175

13F holders

$834.7M

value, 2026 filers

64.3%

of shares outstanding (54.4M sh)

new positions (2026 filers)

Top institutional holders

ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of NPKI's shares outstanding

#	Manager	Shares	Value	% of fund	% of co.	Δ shares QoQ
1	BlackRock, Inc.	7.9M	$126.3M	0.0%	9.4%	+10.2%
2	AMERIPRISE FINANCIAL INC	4.5M	$71.4M	0.0%	5.3%	-20.2%
3	VANGUARD CAPITAL MANAGEMENT LLC	3.6M	$57.4M	0.0%	4.3%	-47.4%
4	AMERICAN CENTURY COMPANIES INC	3.1M	$49.8M	0.0%	3.7%	+2.8%
5	GEODE CAPITAL MANAGEMENT, LLC	2.4M	$37.7M	0.0%	2.8%	+5.6%
6	Thrivent Financial for Lutherans	1.5M	$24,078	0.0%	1.8%	-9.1%
7	MASSACHUSETTS FINANCIAL SERVICES CO /MA/NEW	1.5M	$23.1M	0.0%	1.7%	new
8	Russell Investments Group, Ltd.	1.4M	$22.2M	0.0%	1.7%	-19.1%
9	MORGAN STANLEY	1.3M	$20.0M	0.0%	1.5%	-30.9%
10	Electron Capital Partners, LLC	1.2M	$18.6M	0.7%	1.4%	+6.3%
11	Allianz Asset Management GmbH	1.2M	$16.8M	0.0%	1.4%	0.0%
12	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	1.1M	$18.1M	0.0%	1.3%	-26.3%
13	PRUDENTIAL FINANCIAL INC	1.1M	$17.8M	0.0%	1.3%	-33.8%
14	Qube Research & Technologies Ltd	1.1M	$17.5M	0.0%	1.3%	-3.7%
15	Uniplan Investment Counsel, Inc.	1.1M	$17.3M	1.6%	1.3%	+106.3%
16	MILLENNIUM MANAGEMENT LLC	1.0M	$16.7M	0.0%	1.2%	+560.8%
17	Sixth Street Partners Management Company, L.P.NEW	1.0M	$16.4M	2.8%	1.2%	new
18	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	1.0M	$16.4M	0.0%	1.2%	-6.2%
19	Invesco Ltd.	1.0M	$15.9M	0.0%	1.2%	+272.7%
20	VANGUARD PORTFOLIO MANAGEMENT LLC	978,659	$15.6M	0.0%	1.2%	+13.6%
21	Nuveen, LLC	919,147	$14.6M	0.0%	1.1%	-14.3%
22	NORTHERN TRUST CORP	795,342	$12.7M	0.0%	0.9%	-17.9%
23	WELLINGTON MANAGEMENT GROUP LLP	790,335	$12.6M	0.0%	0.9%	+198.7%
24	First Eagle Investment Management, LLC	721,002	$11.5M	0.0%	0.9%	+31.7%
25	Ancora Advisors LLC	678,760	$10.8M	0.2%	0.8%	-6.7%

Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.