Sable Offshore (SOC) had the highest return in December 2025 by a mid-cap US stock, returning 113.2%.

ASSET	MONTH	% RETURN
Sable Offshore (SOC)	December 2025	113.24%
Structure Therapeutics Inc American Depositary Shares (GPCR)	December 2025	97.25%
Hycroft Mining (HYMC)	December 2025	91.93%
Intuitive Machines (LUNR)	December 2025	76.22%
Andersen (ANDG)	December 2025	62.06%
Digitalbridge (DBRG)	December 2025	61.41%
AXT (AXTI)	December 2025	55.57%
Praxis Precision Medicines (PRAX)	December 2025	52.37%
Vera Therapeutics (VERA)	December 2025	51.75%
Terns Pharmaceuticals (TERN)	December 2025	44.8%
Amicus Therapeutics (FOLD)	December 2025	43.55%
Redwire (RDW)	December 2025	43.13%
ADEIA (ADEA)	December 2025	41.51%
Photronics (PLAB)	December 2025	41.28%
Maase (MAAS)	December 2025	36.71%
Victoria's Secret (VSCO)	December 2025	33.23%
POET Technologies (POET)	December 2025	32.15%
Century Aluminum (CENX)	December 2025	31.21%
Alumis (ALMS)	December 2025	30.48%
Firefly Aerospace Inc Common Stock (FLY)	December 2025	30.13%
American Eagle Outfitters (AEO)	December 2025	29.71%
Abercrombie & Fitch (ANF)	December 2025	29.54%
Almonty Industries Inc Common Shares (ALM)	December 2025	28.61%
Alpha Metallurgical Resources (AMR)	December 2025	27.65%
Middleby (MIDD)	December 2025	26.86%

Mid-cap stocks are treated as having a market cap between $2B and $10B.