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 HDRN 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/HDRN"
Use Arkolith to show who owns HDRN, which funds added or reduced it, and which SEC filings prove each claim.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | TENOR CAPITAL MANAGEMENT Co., L.P. | $20.2M | 1.9M | —Held | Q1 2026 | |
| 2 | HIGHBRIDGE CAPITAL MANAGEMENT LLC | $18.5M | 1.7M | ▼−7.7% Reduced · −144K sh | Q1 2026 | |
| 3 | AQR Arbitrage LLC | $11.8M | 1.1M | —Held | Q1 2026 | |
| 4 | ARISTEIA CAPITAL, L.L.C. | $10.7M | 1.0M | —Held | Q1 2026 | |
| 5 | BOOTHBAY FUND MANAGEMENT, LLC | $6.4M | 604K | ▲New +604K sh | Q1 2026 | |
| 6 | WHITEBOX ADVISORS LLC | $5.9M | 550K | —Held | Q1 2026 | |
| 7 | Westchester Capital Management, LLC | $4.2M | 393K | —Held | Q1 2026 | |
| 8 | First Trust Capital Management L.P. | $2.8M | 265K | ▼−16% Reduced · −50K sh | Q1 2026 | |
| 9 | Polar Asset Management Partners Inc. | $2.7M | 250K | ▲New +250K sh | Q1 2026 | |
| 10 | MOORE CAPITAL MANAGEMENT, LP | $2.1M | 200K | —Held | Q1 2026 | |
| 11 | RIVERNORTH CAPITAL MANAGEMENT, LLC | $2.0M | 185K | ▼−9.7% Reduced · −20K sh | Q1 2026 | |
| 12 | Clear Street Group Inc. | $1.3M | 122K | ▲+11% Added · +12K sh | Q1 2026 | |
| 13 | CITADEL ADVISORS LLC | $605K | 57K | ▼−92% Reduced · −697K 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.
No Form 4 insider transactions on file yet.
| Company | Co-held by | Combined value |
|---|---|---|
| D. BORAL ARC ACQUISIT - CL ABCAR | 16 funds | $79.3M |
| GORES HOLDINGS X INC-CL AGTEN | 15 funds | $99.0M |
| CANTOR EQUITY PARTNERS-CL ACEPF | 15 funds | $91.0M |
| CAL REDWOOD ACQUISIT-CL ACRAQ | 15 funds | $61.5M |
| ACTIVATE ENERGY ACQUISITIONAEAQU | 15 funds | $16.6M |
| BERTO ACQUISITION CORPTACO | 14 funds | $90.1M |
| ARMADA ACQUISITION -CLASS AXRPN | 14 funds | $76.5M |
| WEN ACQUISITION CORP-AWENN | 14 funds | $61.1M |
| COLLECTIVE ACQUISITION CORPCCAQ | 14 funds | $59.6M |
| PLUM ACQUISITION CORP IVPLMK | 14 funds | $57.5M |
| BLUE ACQUISITION CORP-CL ABACC | 14 funds | $57.2M |
| CANTOR EQUITY PARTNERS III-ACAEP | 14 funds | $49.0M |
Ranked by how many of HDRN's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
No filings captured for this ticker in the live stream yet.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for HDRN. 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.