The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
This stock page is the Follow view. The Build view lets your agent query NPK owners, fund changes, insider filings, and source links through REST or MCP.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/NPK"
Use Arkolith to show who owns NPK, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $125.4M | 915K | ▲+5.4% Added · +47K sh | Q1 2026 | |
| 2 | STATE STREET CORP | $54.1M | 395K | ▲+13% Added · +46K sh | Q1 2026 | |
| 3 | DIMENSIONAL FUND ADVISORS LP | $43.1M | 314K | ▼−1.8% Reduced · −6K sh | Q1 2026 | |
| 4 | VANGUARD GROUP INC | $39.6M | 371K | ▼−0.9% Reduced · −3K sh | Q4 2025 | |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $29.3M | 214K | ▲New +214K sh | Q1 2026 | |
| 6 | RENAISSANCE TECHNOLOGIES LLC | $20.3M | 148K | ▼−8.9% Reduced · −15K sh | Q1 2026 | |
| 7 | J. Goldman & Co LP | $17.5M | 128K | ▲+20% Added · +22K sh | Q1 2026 | |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | $17.4M | 127K | ▼−7.6% Reduced · −10K sh | Q1 2026 | |
| 9 | VANGUARD PORTFOLIO MANAGEMENT LLC | $13.3M | 97K | ▲New +97K sh | Q1 2026 | |
| 10 | GAMCO INVESTORS, INC. ET AL | $12.1M | 88K | ▼−7.7% Reduced · −7K sh | Q1 2026 | |
| 11 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $10.3M | 75K | ▲+40% Added · +22K sh | Q1 2026 | |
| 12 | MORGAN STANLEY | $9.6M | 70K | ▲+2.8% Added · +2K sh | Q1 2026 | |
| 13 | Bank of New York Mellon Corp | $8.2M | 60K | ▼−3.2% Reduced · −2K sh | Q1 2026 | |
| 14 | KENNEDY CAPITAL MANAGEMENT LLC | $7.9M | 58K | ▲+1.9% Added · +1K sh | Q1 2026 | |
| 15 | JPMORGAN CHASE & CO | $7.4M | 56K | ▲+148% Added · +33K sh | Q1 2026 | |
| 16 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $6.9M | 50K | ▲+1.4% Added · +675 sh | Q1 2026 | |
| 17 | NORTHERN TRUST CORP | $6.6M | 48K | ▲+4.9% Added · +2K sh | Q1 2026 | |
| 18 | BRANDES INVESTMENT PARTNERS, LP | $5.5M | 40K | ▼−43% Reduced · −30K sh | Q1 2026 | |
| 19 | MILLENNIUM MANAGEMENT LLC | $5.2M | 38K | ▼−30% Reduced · −16K sh | Q1 2026 | |
| 20 | VANGUARD FIDUCIARY TRUST CO | $4.8M | 35K | ▲New +35K sh | Q1 2026 | |
| 21 | FIRST TRUST ADVISORS LP | $4.4M | 32K | ▲+7.0% Added · +2K sh | Q1 2026 | |
| 22 | Atom Investors LP | $3.9M | 29K | ▲+95% Added · +14K sh | Q1 2026 | |
| 23 | PRINCIPAL FINANCIAL GROUP INC | $3.5M | 26K | ▲+2.0% Added · +497 sh | Q1 2026 | |
| 24 | GABELLI FUNDS LLC | $3.5M | 25K | ▼−1.2% Reduced · −300 sh | Q1 2026 | |
| 25 | GOLDMAN SACHS GROUP INC | $3.5M | 25K | ▼−40% Reduced · −17K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Mar 17, 2026 | Peuse David J | CFO & TREASURER | Sell (S) | 500 | $70K |
| Mar 16, 2026 | Frederick Douglas J | COO, VP, SECRETARY, Director | Tax withholding (F) | 36 | $5K |
| Mar 16, 2026 | MacKenzie John Roderick JR | VP-SALES | Tax withholding (F) | 62 | $8K |
| Mar 16, 2026 | Morgan Jeffery Alan | VP-ENGINEERING | Tax withholding (F) | 100 | $13K |
| Mar 16, 2026 | Peuse David J | CFO & TREASURER | Tax withholding (F) | 78 | $10K |
| Mar 11, 2026 | LIEBLE RANDY F | Director | Sell (S) | 2K | $348K |
| Jan 2, 2026 | Morgan Jeffery Alan | VP-ENGINEERING | Grant (A) | 234 | $0 |
| Jan 2, 2026 | Stienessen Joseph G | Director | Grant (A) | 100 | $0 |
| Jan 2, 2026 | Frederick Douglas J | COO, VP, SECRETARY, Director | Grant (A) | 386 | $0 |
| Jan 2, 2026 | Peuse David J | CFO & TREASURER | Grant (A) | 327 | $0 |
| Jan 2, 2026 | QUINN PATRICK J | Director | Grant (A) | 100 | $0 |
| Jan 2, 2026 | LIEBLE RANDY F | Director | Grant (A) | 100 | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| MICROSOFT CORPMSFT | 48 funds | $19.8B |
| ALPHABET INC-CL AGOOGL | 48 funds | $14.3B |
| UNITEDHEALTH GROUP INCUNH | 48 funds | $3.0B |
| FEDEX CORPFDX | 48 funds | $1.9B |
| JPMORGAN CHASE & COJPM | 47 funds | $6.9B |
| MICRON TECHNOLOGY INCMU | 47 funds | $4.5B |
| CHEVRON CORPCVX | 47 funds | $3.1B |
| BANK OF AMERICA CORPBAC | 47 funds | $2.4B |
| WELLS FARGO & COWFC | 47 funds | $2.4B |
| TJX COMPANIES INCTJX | 47 funds | $1.9B |
| BOSTON SCIENTIFIC CORPBSX | 47 funds | $1.4B |
| SERVICENOW INCNOW | 47 funds | $1.3B |
Ranked by how many of NPK's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for NPK. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes. Every panel above is one call to the Arkolith API & MCP server.