Intuitive Surgical (ISRG) had the highest return in July 2000 by a US stock in the S&P 500 (GSPC), returning 93.6%.

ASSET	MONTH	% RETURN
Intuitive Surgical (ISRG)	July 2000	93.58%
CoStar (CSGP)	July 2000	46.02%
Humana (HUM)	July 2000	40.96%
Quest Diagnostics (DGX)	July 2000	37.33%
Charles River Laboratories (CRL)	July 2000	36.06%
CH Robinson Worldwide (CHRW)	July 2000	34.24%
Travelers Companies (TRV)	July 2000	30.7%
Capital One Financial (COF)	July 2000	30.28%
Chubb (CB)	July 2000	29.15%
Laboratory Corporation of America (LH)	July 2000	27.8%
W R Berkley (WRB)	July 2000	27.64%
DaVita HealthCare Partners (DVA)	July 2000	27.09%
Frank's International (FI)	July 2000	26.85%
Steel Dynamics (STLD)	July 2000	25.69%
Cognizant Technology Solutions Corp Class A (CTSH)	July 2000	23.68%
Albemarle (ALB)	July 2000	23.44%
PPL (PPL)	July 2000	23.08%
Norfolk Southern (NSC)	July 2000	22.94%
Southwest Airlines (LUV)	July 2000	22.73%
Allstate (ALL)	July 2000	22.5%
Electronic Arts (EA)	July 2000	21.36%
Mohawk Industries (MHK)	July 2000	21.31%
Everest (EG)	July 2000	21.18%
Lennar (LEN)	July 2000	20.38%
Fastenal (FAST)	July 2000	20.2%