Caxton Corp.

In its 13F for Q3 2025 (holdings as of September 30, 2025, filed November 14, 2025), Caxton Corp. reported 12 stock positions worth $22.9 million. Its top holding was Rezolute (RZLT) at 81.7% of the portfolio, followed by SPDR Gold Shares (GLD, 11.3%) and Berkshire Hathaway Class B (BRK.B, 1.4%). Compared with Q2 2025, it opened 1 new position, added to 4 and reduced 1. The biggest buy was Rezolute (RZLT, shares +24%) and the biggest sale Mind Medicine Mindmed (shares −21%).

Most Recent 13F
Q2 2026
Location
Princeton, NJ
CIK
0001388551
Portfolio Value
$22.9M (Q3 2025)
SEC Filing
0000919574-25-006891 ↗ filed Nov 14, 2025

Holdings Value

0$5.0M$10.0M$15.0M$20.0M$25.0M Q1 2024: $17.6M Q1 2024 Q2 2024: $19.7M Q2 2024 Q3 2024: $24.2M Q3 2024 Q4 2024: $16.6M Q4 2024 Q1 2025: $5.1M Q1 2025 Q2 2025: $9.9M Q2 2025 Q3 2025: $22.9M $22.9M Q3 2025 Q4 2025: $4.3M Q4 2025 Q1 2026: $4.0M Q1 2026 Q2 2026: $1.9M Q2 2026

Holdings 12 stocks · $22.9M
RZLT Rezolute Inc. 81.70% 1,986,818 $18.7M Add +23.9%
GLD SPDR Gold Shares 11.33% 7,286 $2.6M Add +47.1%
BRK.B Berkshire Hathaway Inc. Class B 1.43% 651 $327K Add +3.0%
MIND MEDICINE MINDMED INC 1.39% 27,011 $318K Reduce -20.7%
ELVN Enliven Therapeutics Inc. 1.17% 13,097 $268K No change
CMPX Compass Therapeutics Inc. 0.82% 53,503 $187K Add +23.1%
BCAX Bicara Therapeutics Inc. 0.76% 10,941 $173K No change
KYTX Kyverna Therapeutics Inc. 0.60% 22,981 $138K No change
LXEO Lexeo Therapeutics Inc. 0.50% 17,332 $115K No change
IKT Inhibikase Therapeutics Inc. 0.12% 16,393 $27K No change
SABS Sab Biotherapeutics Inc. 0.10% 10,935 $22K New
CNTX Context Therapeutics Inc. 0.08% 18,403 $18K No change

Portfolio Sells Q2 2025 → Q3 2025
MIND MEDICINE MINDMED INC Reduce -20.7% 1.39% −0.85

Portfolio Buys Q2 2025 → Q3 2025
RZLT Rezolute Inc. Add +23.9% 81.70% +9.10
SABS Sab Biotherapeutics Inc. New 0.10% +0.10
CMPX Compass Therapeutics Inc. Add +23.1% 0.82% −0.33
BRK.B Berkshire Hathaway Inc. Class B Add +3.0% 1.43% −1.68
GLD SPDR Gold Shares Add +47.1% 11.33% −3.99

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 10$1.9MSPCX, BRK.B, GOOGL, VOO, BX
Q1 2026 7$4.0MGLD, BRK.B, KYTX, LXEO, XFOR
Q4 2025 11$4.3MGLD, BRK.B, SYRE, MIND MEDICINE MINDMED INC, KYTX
Q3 2025 12$22.9MRZLT, GLD, BRK.B, MIND MEDICINE MINDMED INC, ELVN
Q2 2025 11$9.9MRZLT, GLD, BRK.B, ELVN, MIND MEDICINE MINDMED INC
Q1 2025 12$5.1MRZLT, GLD, BRK.B, MIND MEDICINE MINDMED INC, BCAX
Q4 2024 15$16.6MXERS, RZLT, SPY, BRK.B, GLD
Q3 2024 12$24.2MXERS, RZLT, SPY, BRK.B, BCAX
Q2 2024 12$19.7MXERS, RZLT, SPY, BRK.B, LXEO
Q1 2024 11$17.6MXERS, RZLT, SPY, BRK.B, KYTX