Who owns NPK (NPK)
Which tracked institutional funds hold NPK, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See NPK company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on NPK is one-sided between 2025-Q4 and 2026-Q1: 52 added or opened and 16 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
NPK’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes NPK more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in NPK divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 184 tracked filers holding NPK, 86 increased or opened the position and 70 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in NPK between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 10
- VANGUARD CAPITAL MANAGEMENT LLC$29M
- ADVISORY RESEARCH INC$20M
- VANGUARD PORTFOLIO MANAGEMENT LLC$13M
- VANGUARD FIDUCIARY TRUST CO$5M
- JANE STREET GROUP, LLC$3M
- Tidal Investments LLC$3M
Full exits 4
- VANGUARD GROUP INC$35M
- HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC$3M
- ALGERT GLOBAL LLC$1M
- GUGGENHEIM CAPITAL LLC$861K
Largest adds
- BlackRock, Inc.$33M
- STATE STREET CORP$17M
- DIMENSIONAL FUND ADVISORS LP$9M
- J. Goldman & Co LP$6M
- JPMORGAN CHASE & CO$5M
- MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.$5M
Largest trims
- Medina Value Partners, LLC$4M
- BRANDES INVESTMENT PARTNERS, LP$2M
- CITADEL ADVISORS LLC$1M
- Jump Financial, LLC$1M
- GOLDMAN SACHS GROUP INC$1M
- Invesco Ltd.$970K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 915,186 | $125M | 20.1% | 2026-Q1 |
| STATE STREET CORP added | 394,560 | $54M | 8.7% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 314,283 | $43M | 6.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 213,869 | $29M | 4.7% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 148,300 | $20M | 3.3% | 2026-Q1 |
| ADVISORY RESEARCH INC new | 147,634 | $20M | 3.2% | 2026-Q1 |
| Medina Value Partners, LLC trimmed | 138,696 | $19M | 3.0% | 2026-Q1 |
| J. Goldman & Co LP added | 127,601 | $17M | 2.8% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 127,255 | $17M | 2.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 97,113 | $13M | 2.1% | 2026-Q1 |
| GAMCO INVESTORS, INC. ET AL trimmed | 88,430 | $12M | 1.9% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 75,355 | $10M | 1.7% | 2026-Q1 |
| MORGAN STANLEY added | 69,881 | $10M | 1.5% | 2026-Q1 |
| EVR Research LP trimmed | 65,000 | $9M | 1.4% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 59,948 | $8M | 1.3% | 2026-Q1 |
| KENNEDY CAPITAL MANAGEMENT LLC added | 57,774 | $8M | 1.3% | 2026-Q1 |
| STEEL PARTNERS HOLDINGS L.P. | 56,469 | $8M | 1.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 54,309 | $7M | 1.2% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 55,986 | $7M | 1.2% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 50,235 | $7M | 1.1% | 2026-Q1 |
| NORTHERN TRUST CORP added | 48,141 | $7M | 1.1% | 2026-Q1 |
| BRANDES INVESTMENT PARTNERS, LP trimmed | 40,208 | $6M | 0.9% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 38,281 | $5M | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 34,679 | $5M | 0.8% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 32,169 | $4M | 0.7% | 2026-Q1 |
| MARTIN & CO INC /TN/ added | 29,142 | $4M | 0.6% | 2026-Q1 |
| Atom Investors LP added | 28,508 | $4M | 0.6% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 25,716 | $4M | 0.6% | 2026-Q1 |
| GABELLI FUNDS LLC trimmed | 25,452 | $3M | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 25,256 | $3M | 0.6% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 25,254 | $3M | 0.6% | 2026-Q1 |
| Guardian Wealth Management, Inc. trimmed | 24,721 | $3M | 0.5% | 2026-Q1 |
| Tidal Investments LLC new | 25,230 | $3M | 0.5% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 19,159 | $3M | 0.4% | 2026-Q1 |
| Uncommon Cents Investing LLC | 19,010 | $3M | 0.4% | 2026-Q1 |
| Public Sector Pension Investment Board added | 18,928 | $3M | 0.4% | 2026-Q1 |
| UBS Group AG added | 15,717 | $2M | 0.3% | 2026-Q1 |
| Pullen Investment Management, LLC added | 15,230 | $2M | 0.3% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 14,244 | $2M | 0.3% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 13,191 | $2M | 0.3% | 2026-Q1 |
| Legal & General Group Plc trimmed | 11,695 | $2M | 0.3% | 2026-Q1 |
| SEGALL BRYANT & HAMILL, LLC trimmed | 11,009 | $2M | 0.2% | 2026-Q1 |
| Nuveen, LLC trimmed | 10,857 | $1M | 0.2% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 10,714 | $1M | 0.2% | 2026-Q1 |
| Swiss National Bank | 10,600 | $1M | 0.2% | 2026-Q1 |
| MARTINGALE ASSET MANAGEMENT L P added | 10,206 | $1M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 9,863 | $1M | 0.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 9,320 | $1M | 0.2% | 2026-Q1 |
| Qube Research & Technologies Ltd trimmed | 8,934 | $1M | 0.2% | 2026-Q1 |
| Claret Asset Management Corp trimmed | 8,200 | $1M | 0.2% | 2026-Q1 |
| Aristides Capital LLC added | 8,029 | $1M | 0.2% | 2026-Q1 |
| CORSAIR CAPITAL MANAGEMENT, L.P. | 8,022 | $1M | 0.2% | 2026-Q1 |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM trimmed | 7,385 | $1M | 0.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 7,027 | $963K | 0.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 6,401 | $878K | 0.1% | 2026-Q1 |
| XTX Topco Ltd added | 6,307 | $864K | 0.1% | 2026-Q1 |
| NORGES BANK trimmed | 9,600 | $844K | 0.1% | 2026-Q1 |
| Brevan Howard Capital Management LP added | 6,081 | $833K | 0.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 6,069 | $832K | 0.1% | 2026-Q1 |
| CWM, LLC trimmed | 5,830 | $799K | 0.1% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 5,645 | $774K | 0.1% | 2026-Q1 |
| Creative Planning added | 5,591 | $766K | 0.1% | 2026-Q1 |
| CANADA LIFE ASSURANCE Co added | 5,037 | $694K | 0.1% | 2026-Q1 |
| Quantinno Capital Management LP added | 4,991 | $684K | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 4,908 | $673K | 0.1% | 2026-Q1 |
| Mariner, LLC added | 4,894 | $671K | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 4,865 | $667K | 0.1% | 2026-Q1 |
| Horizon Investments, LLC trimmed | 4,822 | $661K | 0.1% | 2026-Q1 |
| Aquatic Capital Management LLC added | 4,595 | $630K | 0.1% | 2026-Q1 |
| Trexquant Investment LP added | 4,246 | $582K | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 4,147 | $568K | 0.1% | 2026-Q1 |
| Quadrature Capital Ltd added | 3,959 | $543K | 0.1% | 2026-Q1 |
| MARIETTA INVESTMENT PARTNERS LLC | 3,825 | $524K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 4,892 | $522K | 0.1% | 2026-Q1 |
| Meixler Investment Management, Ltd. added | 3,432 | $486K | 0.1% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 3,545 | $486K | 0.1% | 2026-Q1 |
| Thrivent Financial for Lutherans trimmed | 3,533 | $484K | 0.1% | 2026-Q1 |
| EVERGREEN CAPITAL MANAGEMENT LLC added | 3,507 | $481K | 0.1% | 2026-Q1 |
| LPL Financial LLC trimmed | 3,485 | $478K | 0.1% | 2026-Q1 |
| SYON CAPITAL LLC trimmed | 3,316 | $454K | 0.1% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 3,307 | $453K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 330,453 | $35M | 5.7% | 2025-Q4 stale |
| Western Standard LLC | 60,730 | $7M | 1.1% | 2025-Q3 stale |
| Amanah Holdings Trust | 45,000 | $5M | 0.8% | 2025-Q3 stale |
| Walleye Capital LLC added | 33,623 | $4M | 0.6% | 2025-Q3 stale |
| Massar Capital Management, LP trimmed | 32,500 | $4M | 0.6% | 2025-Q3 stale |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | 30,530 | $3M | 0.5% | 2025-Q4 stale |
| Wallace Capital Management Inc. trimmed | 21,987 | $2M | 0.3% | 2025-Q1 stale |
| Numerai GP LLC trimmed | 15,947 | $2M | 0.3% | 2025-Q3 stale |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | 18,712 | $2M | 0.3% | 2025-Q1 stale |
| Allspring Global Investments Holdings, LLC added | 14,527 | $1M | 0.2% | 2025-Q1 stale |
| Faithward Advisors, LLC trimmed | 9,301 | $1M | 0.2% | 2025-Q3 stale |
| ALGERT GLOBAL LLC trimmed | 9,577 | $1M | 0.2% | 2025-Q4 stale |
| GUGGENHEIM CAPITAL LLC new | 8,068 | $861K | 0.1% | 2025-Q4 stale |
| EXCHANGE TRADED CONCEPTS, LLC added | 8,735 | $856K | 0.1% | 2025-Q2 stale |
| RAYMOND JAMES FINANCIAL INC new | 7,709 | $755K | 0.1% | 2025-Q2 stale |
| Ellsworth Advisors, LLC added | 7,161 | $701K | 0.1% | 2025-Q2 stale |
| D. E. Shaw & Co., Inc. trimmed | 6,052 | $593K | 0.1% | 2025-Q2 stale |
| Cubist Systematic Strategies, LLC added | 6,023 | $590K | 0.1% | 2025-Q2 stale |
| ROYCE & ASSOCIATES LP trimmed | 4,799 | $470K | 0.1% | 2025-Q2 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.