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 NEPH 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/NEPH"
Use Arkolith to show who owns NEPH, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | Mesirow Financial Investment Management, Inc. | $358K | 120K | ▲+140% Added · +70K sh | Q1 2026 | |
| 2 | VANGUARD FIDUCIARY TRUST CO | $110K | 37K | ▲New +37K sh | Q1 2026 | |
| 3 | BLAIR WILLIAM & CO/IL | $108K | 36K | —Held | Q1 2026 | |
| 4 | CITADEL ADVISORS LLC | $62K | 21K | ▲+0.8% Added · +178 sh | Q1 2026 | |
| 5 | STATE STREET CORP | $47K | 16K | —Held | Q1 2026 | |
| 6 | Cannell & Spears LLC | $33K | 11K | —Held | 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 |
|---|---|---|---|---|---|
| May 11, 2026 | Amron Arthur H | Director | Grant (A) | 4K | $0 |
| Mar 23, 2026 | Banks Robert R. Jr. | President and CEO | Option exercise (M) | 120K | $173K |
| Mar 23, 2026 | Krandel Judy | Chief Financial Officer | Option exercise (M) | 69K | $118K |
| Mar 23, 2026 | Krandel Judy | Chief Financial Officer | Option exercise (M) | 69K | $0 |
| Mar 23, 2026 | Banks Robert R. Jr. | President and CEO | Option exercise (M) | 120K | $0 |
| Mar 16, 2026 | Amron Arthur H | Director | Grant (A) | 4K | $0 |
| Mar 16, 2026 | Krandel Judy | Chief Financial Officer | Grant (A) | 4K | $0 |
| Nov 10, 2025 | Amron Arthur H | Director | Grant (A) | 5K | $0 |
| Nov 10, 2025 | Spandow Oliver J. | Director | Grant (A) | 8K | $0 |
| Nov 10, 2025 | Nettis Lisa Marie | Director | Grant (A) | 2K | $0 |
| Aug 11, 2025 | Nettis Lisa Marie | Director | Grant (A) | 13K | $0 |
| Mar 27, 2025 | Krandel Judy | Chief Financial Officer | Grant (A) | 54K | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| APPLE INCAAPL | 7 funds | $4.1B |
| AMAZON.COM INCAMZN | 7 funds | $3.7B |
| MICROSOFT CORPMSFT | 7 funds | $3.2B |
| ALPHABET INC-CL CGOOG | 7 funds | $2.2B |
| MICRON TECHNOLOGY INCMU | 7 funds | $2.0B |
| JPMORGAN CHASE & COJPM | 7 funds | $1.8B |
| BROADCOM INCAVGO | 7 funds | $1.6B |
| TAIWAN SEMICONDUCTOR-SP ADRTSM | 7 funds | $1.5B |
| COSTCO WHOLESALE CORPCOST | 7 funds | $1.3B |
| TESLA INCTSLA | 7 funds | $1.2B |
| MASTERCARD INC - AMA | 7 funds | $1.1B |
| PARKER HANNIFIN CORPPH | 7 funds | $1.0B |
Ranked by how many of NEPH'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 NEPH. 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.