Sandstorm Gold Ltd N (SAND) had the highest return between 2010 and 2013 by a mid-cap US stock, returning 456,211.1%.

ASSET	YEARS	% RETURN
Sandstorm Gold Ltd N (SAND)	2010-2013	456,211.11%
Aris Mining (ARMN)	2010-2013	2,325.31%
ACADIA Pharmaceuticals (ACAD)	2010-2013	1,793.18%
Jazz Pharmaceuticals (JAZZ)	2010-2013	1,470.22%
Nexstar Broadcasting (NXST)	2010-2013	1,301.91%
Vipshop (VIPS)	2010-2013	1,294.64%
Patrick Industries (PATK)	2010-2013	1,076.07%
Melco Resorts & Entertainment (MLCO)	2010-2013	1,030.24%
Acadia Healthcare (ACHC)	2010-2013	956.47%
Lithia Motors (LAD)	2010-2013	785.4%
Bausch Health Companies (BHC)	2010-2013	785.27%
HCI (HCI)	2010-2013	726.48%
Axos Financial (AX)	2010-2013	684.3%
CVR Energy (CVI)	2010-2013	682.12%
Travere Therapeutics (TVTX)	2010-2013	677.78%
Dorman Products (DORM)	2010-2013	637.24%
Polaris Industries (PII)	2010-2013	617.59%
Generac (GNRC)	2010-2013	561.22%
Under Armour Inc A (UAA)	2010-2013	535.6%
Western Alliance Bancorporation (WAL)	2010-2013	513.38%
PriceSmart (PSMT)	2010-2013	491.37%
Sirius XM (SIRI)	2010-2013	482.65%
Chart Industries (GTLS)	2010-2013	468.95%
Dillard's (DDS)	2010-2013	458.04%
Sapiens International (SPNS)	2010-2013	437.76%

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