CAXTON CORP — 13F Holdings & Portfolio
CIK 1388551 · latest 13F-HR filed 2026-08-14
CAXTON CORP manages $1.9M in 13F-reported U.S. long-equity assets across 10 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are SPCX (24.03%), BRK.B (20.35%), GOOGL (13.32%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 4 new positions and exited 1; 3 existing positions rose in reported value and 1 fell.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
Long-equity book
Distinct positions
Filed 2026-08-14
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.
Sector mix
% of 13F valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q1 26 → Q2 26Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.
13F assets and positions
4 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 100%Cumulative share of the portfolio held in the largest N positions.
As of the firm’s regulatory filing dated Sep 18, 2026.
2ND FLOOR
LONDON SW1Y 5AN
United Kingdom
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| COOK HOLDINGS SERIES LLC Control | LIMITED PARTNER since Jan 2025 | 10–25% | Foreign Entity |
| LAW, ANDREW, ERIC Control | CHAIRMAN, CHIEF EXECUTIVE OFFICER AND LIMITED PARTNER since Jan 2025 | 50–75% | Individual |
| NICHOLLS, CHANELLE, LORRAINE Control | CHIEF FINANCIAL OFFICER since Mar 2021 | Less than 5% | Individual |
| OHLY, BENJAMIN, STEPHAN Control | CHIEF COMPLIANCE OFFICER since May 2023 | Less than 5% | Individual |
| UNDERWOOD, ALEXANDER, MICHAEL Control | GENERAL COUNSEL since Feb 2022 | Less than 5% | Individual |
| WADE, MATTHEW, DUNCAN Control | CHIEF OPERATING OFFICER, CHIEF RISK OFFICER AND LIMITED PARTNER since Jan 2025 | 5–10% | Individual |
| FOSTER, KENDRA, LOREAN Control Indirect owner via COOK HOLDINGS SERIES LLC | MANAGER since Jul 2023 | General partner, trustee or manager | Individual |
| G-PETERSHILL LP Control Indirect owner via PETERSHILL PARTNERS, INC | SOLE SHAREHOLDER since Dec 2025 | 75% or more | Foreign Entity |
| GERLIS, JASON, NEAL Control Indirect owner via COOK HOLDINGS SERIES LLC | MANAGER since Jul 2022 | General partner, trustee or manager | Individual |
| HOLMAN, TAVIN, STANLEY Control Indirect owner via COOK HOLDINGS SERIES LLC | MANAGER since Jan 2023 | General partner, trustee or manager | Individual |
| MIRABILE, ANTHONY, FRANCIS Control Indirect owner via COOK HOLDINGS SERIES LLC | MANAGER since Jun 2023 | General partner, trustee or manager | Individual |
| PETERSHILL PARTNERS LIMITED Control Indirect owner via G-PETERSHILL LP | MAJORITY SHAREHOLDER since Sep 2021 | 75% or more | Foreign Entity |
| PETERSHILL PARTNERS, INC Control Indirect owner via PHP DE 1 LP | SOLE SHAREHOLDER since Jan 2024 | 75% or more | Domestic Entity |
| PH PE IM AGGREGATOR LP Control Indirect owner via PETERSHILL PARTNERS LIMITED | SHAREHOLDER since Dec 2025 | 25–50% | Foreign Entity |
| PHP DE 1 LP Control Indirect owner via COOK HOLDINGS SERIES LLC | MEMBER since Jan 2024 | 50–75% | Domestic Entity |
| REDMAN, LAURA, LYNNE Control Indirect owner via COOK HOLDINGS SERIES LLC | MANAGER since Dec 2022 | General partner, trustee or manager | Individual |
Ownership & leadership changes · 1 filing with changes since Jan 15, 2025
From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.
- No longer listedPETERSHILL PARTNERS PLC · SOLE SHAREHOLDER · 75% or more · indirect via PETERSHILL PARTNERS, INC · control person · listed since Sep 2021
- AddedG-PETERSHILL LP · SOLE SHAREHOLDER · 75% or more · indirect via PETERSHILL PARTNERS, INC · control person
- AddedPETERSHILL PARTNERS LIMITED · MAJORITY SHAREHOLDER · 75% or more · indirect via G-PETERSHILL LP · control person
- AddedPH PE IM AGGREGATOR LP · SHAREHOLDER · 25–50% · indirect via PETERSHILL PARTNERS LIMITED · control person
- ListedCOOK HOLDINGS SERIES LLC · LIMITED PARTNER · 10–25% · control person
- ListedFOSTER, KENDRA, LOREAN · MANAGER · General partner, trustee or manager · indirect via COOK HOLDINGS SERIES LLC · control person
- ListedGERLIS, JASON, NEAL · MANAGER · General partner, trustee or manager · indirect via COOK HOLDINGS SERIES LLC · control person
- ListedHOLMAN, TAVIN, STANLEY · MANAGER · General partner, trustee or manager · indirect via COOK HOLDINGS SERIES LLC · control person
- ListedLAW, ANDREW, ERIC · CHAIRMAN, CHIEF EXECUTIVE OFFICER AND LIMITED PARTNER · 50–75% · control person
- ListedMIRABILE, ANTHONY, FRANCIS · MANAGER · General partner, trustee or manager · indirect via COOK HOLDINGS SERIES LLC · control person
- ListedNICHOLLS, CHANELLE, LORRAINE · CHIEF FINANCIAL OFFICER · Less than 5% · control person
- ListedOHLY, BENJAMIN, STEPHAN · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ListedPETERSHILL PARTNERS PLC · SOLE SHAREHOLDER · 75% or more · indirect via PETERSHILL PARTNERS, INC · control person
- ListedPETERSHILL PARTNERS, INC · SOLE SHAREHOLDER · 75% or more · indirect via PHP DE 1 LP · control person
- ListedPHP DE 1 LP · MEMBER · 50–75% · indirect via COOK HOLDINGS SERIES LLC · control person
- ListedREDMAN, LAURA, LYNNE · MANAGER · General partner, trustee or manager · indirect via COOK HOLDINGS SERIES LLC · control person
- ListedUNDERWOOD, ALEXANDER, MICHAEL · GENERAL COUNSEL · Less than 5% · control person
- ListedWADE, MATTHEW, DUNCAN · CHIEF OPERATING OFFICER, CHIEF RISK OFFICER AND LIMITED PARTNER · 5–10% · control person
Quarter-over-quarter changes
Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.
Top Adds (vs prior quarter)
- BERKSHIRE HATHAWAY INC DEL$28.8K +8.3%
- INHIBIKASE THERAPEUTICS INC$10.0K +20.8%
- X4 PHARMACEUTICALS INC$8.4K +13.1%
New Positions
- SPACE EXPLORATION TECHN CORP$445.3K
- ALPHABET INC$246.9K
- VANGUARD INDEX FDS$233.1K
- BLACKSTONE INC$188.2K
CAXTON CORP Holdings (2026-06-30)
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | SPACE EXPLORATION TECHN CORP | SPCX | 84615Q103 | $445.3K | 24.03% | 2,606 | SH |
| 2 | BERKSHIRE HATHAWAY INC DEL | BRK.B | 084670702 | $377.1K | 20.35% | 754 | SH |
| 3 | ALPHABET INC | GOOGL | 02079K305 | $246.9K | 13.32% | 691 | SH |
| 4 | VANGUARD INDEX FDS | VOO | 922908363 | $233.1K | 12.58% | 339 | SH |
| 5 | BLACKSTONE INC | BX | 09260D107 | $188.2K | 10.16% | 1,597 | SH |
| 6 | KYVERNA THERAPEUTICS INC | KYTX | 501976104 | $110.0K | 5.94% | 12,347 | SH |
| 7 | LEXEO THERAPEUTICS INC | LXEO | 52886X107 | $79.0K | 4.26% | 16,962 | SH |
| 8 | X4 PHARMACEUTICALS INC | XFOR | 98420X202 | $72.7K | 3.92% | 15,557 | SH |
| 9 | INHIBIKASE THERAPEUTICS INC | IKT | 45719W205 | $57.8K | 3.12% | 28,453 | SH |
| 10 | ALX ONCOLOGY HLDGS INC | ALXO | 00166B105 | $43.4K | 2.34% | 20,946 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $1.9M | 10 | 0000919574-26-005174 |
| 2026-03-31 | 2026-05-14 | $4.0M | 7 | 0000919574-26-003017 |
| 2025-12-31 | 2026-02-13 | $4.3M | 11 | 0000919574-26-000956 |
| 2025-09-30 | 2025-11-14 | $22.9M | 12 | 0000919574-25-006891 |
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