30 tracked 13F filers disclose a position in HDRN as of the latest SEC 13F filings, a combined $148.5M in reported value. 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.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | TENOR CAPITAL MANAGEMENT Co., L.P. | $20.2M | 1.9M | —Held | Q1 2026 | |
| 2 | BERKLEY W R CORP | $18.5M | 1.7M | ▲+310% Added · +1.3M sh | Q1 2026 | |
| 3 | HIGHBRIDGE CAPITAL MANAGEMENT LLC | $18.5M | 1.7M | ▼−7.7% Reduced · −144K sh | Q1 2026 | |
| 4 | TORONTO DOMINION BANK | $13.0M | 1.2M | ▲+80% Added · +544K sh | Q1 2026 | |
| 5 | AQR Arbitrage LLC | $11.8M | 1.1M | —Held | Q1 2026 | |
| 6 | ARISTEIA CAPITAL, L.L.C. | $10.7M | 1.0M | —Held | Q1 2026 | |
| 7 | D. E. Shaw & Co., Inc. | $10.5M | 990K | —Held | Q1 2026 | |
| 8 | BOOTHBAY FUND MANAGEMENT, LLC | $6.4M | 604K | ▲New +604K sh | Q1 2026 | |
| 9 | WHITEBOX ADVISORS LLC | $5.9M | 550K | —Held | Q1 2026 | |
| 10 | Westchester Capital Management, LLC | $4.2M | 393K | —Held | Q1 2026 | |
| 11 | Shay Capital LLC | $3.7M | 344K | ▼−31% Reduced · −151K sh | Q1 2026 | |
| 12 | GOLDMAN SACHS GROUP INC | $3.1M | 288K | —Held | Q1 2026 | |
| 13 | Radcliffe Capital Management, L.P. | $3.1M | 287K | —Held | Q1 2026 | |
| 14 | First Trust Capital Management L.P. | $2.8M | 265K | ▼−16% Reduced · −50K sh | Q1 2026 | |
| 15 | MILLENNIUM MANAGEMENT LLC | $2.7M | 250K | ▼−37% Reduced · −146K sh | Q1 2026 | |
| 16 | LINDEN ADVISORS LP | $2.7M | 250K | —Held | Q1 2026 | |
| 17 | Polar Asset Management Partners Inc. | $2.7M | 250K | ▲New +250K sh | Q1 2026 | |
| 18 | MOORE CAPITAL MANAGEMENT, LP | $2.1M | 200K | —Held | Q1 2026 | |
| 19 | RIVERNORTH CAPITAL MANAGEMENT, LLC | $2.0M | 185K | ▼−9.7% Reduced · −20K sh | Q1 2026 | |
| 20 | Clear Street Group Inc. | $1.3M | 122K | ▲+11% Added · +12K sh | Q1 2026 | |
| 21 | Ionic Capital Management LLC | $746K | 70K | —Held | Q1 2026 | |
| 22 | CITADEL ADVISORS LLC | $605K | 57K | ▼−92% Reduced · −697K sh | Q1 2026 | |
| 23 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $508K | 48K | ▲+80% Added · +21K sh | Q1 2026 | |
| 24 | GEODE CAPITAL MANAGEMENT, LLC | $424K | 40K | ▼−25% Reduced · −13K sh | Q1 2026 | |
| 25 | CANTOR FITZGERALD, L. P. | $266K | 25K | —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.
Last quarter, 2 funds opened a new position in HDRN and 1 added to an existing one, while 7 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| CANTOR EQUITY PARTNERS-CL ACEPF | 18 funds | $113.7M |
| D. BORAL ARC ACQUISIT - CL ABCAR | 17 funds | $111.4M |
| PLUM ACQUISITION CORP IVPLMK | 17 funds | $85.1M |
| CANTOR EQUITY PARTNERS I-ACEPO | 17 funds | $48.6M |
| SOULPOWER ACQUISITION CO-ASOUL | 16 funds | $117.4M |
| CANTOR EQUITY PARTNERS-CL ACEPV | 16 funds | $62.2M |
| SIDDHI ACQUISITION CORP-ASDHI | 15 funds | $123.7M |
| IDEA ACQUISITION CORPIACOU | 15 funds | $112.9M |
| NEW PROVIDENCE ACQUISITION-ANPAC | 15 funds | $105.2M |
| ENHANCED GROUP INCENHA | 15 funds | $102.9M |
| ANDRETTI ACQUISITION CORP -APOLE | 15 funds | $101.1M |
| ARMADA ACQUISITION -CLASS AXRPN | 15 funds | $97.4M |
Ranked by how many of HDRN's institutional holders also hold each name, a cross-fund conviction signal.
No open-market insider transactions on file yet. Grants, gifts, and exercises live on the full insider page.
| Class | 13F holders | Value held |
|---|---|---|
| HDRNthis pageORD SHS CL A | 30 funds | $148.5M |
| HDRNWWarrant | 19 funds | $3.1M |
| GIGGUUNIT 99/99/9999 | 2 funds | $141K |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for HDRN
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/HDRN/capital-change-brief"
Use Arkolith's capital_change_brief for HDRN. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
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.