Castellum (CTM) had the highest return in Q4 2011 by a US stock, returning 9,999,900%.

ASSET	QUARTER	% RETURN
Castellum (CTM)	Q4 2011	9,999,900%
Versus Systems Inc. (VS)	Q4 2011	296,284.69%
Mawson Infrastructure (MIGI)	Q4 2011	669.23%
Algorhythm (RIME)	Q4 2011	500%
Alto Ingredients (ALTO)	Q4 2011	292.59%
Freedom (FRHC)	Q4 2011	244.44%
Green Brick Partners (GRBK)	Q4 2011	240.03%
SurgePays (SURG)	Q4 2011	200%
Coda Octopus (CODA)	Q4 2011	183.33%
Expedia (EXPE)	Q4 2011	176.71%
ImmunoPrecise Antibodies (HYFT)	Q4 2011	173.08%
Live Ventures (LIVE)	Q4 2011	149.38%
OLB (OLB)	Q4 2011	143.9%
Lightwave Logic (LWLG)	Q4 2011	126.56%
Patrick Industries (PATK)	Q4 2011	121.62%
Theriva Biologics (TOVX)	Q4 2011	121.05%
Maywood Acquisition Corp Class A Ordinary Shares (MAYA)	Q4 2011	120%
Flotek Industries (FTK)	Q4 2011	116.05%
Broadwind Energy (BWEN)	Q4 2011	112.5%
Greenbrier Companies (GBX)	Q4 2011	111.13%
Acco Brands (ACCO)	Q4 2011	105.32%
MGIC Investment (MTG)	Q4 2011	102.71%
The9 Ltd ADR (NCTY)	Q4 2011	100.56%
Natural Alternatives International (NAII)	Q4 2011	98.21%
Ryvyl (RVYL)	Q4 2011	98.02%