VeriSign (VRSN) had the highest return in March 1998 by a US stock in the S&P 500 (GSPC), returning 53.7%.

ASSET	MONTH	% RETURN
VeriSign (VRSN)	March 1998	53.71%
Quanta Services (PWR)	March 1998	41.05%
Freeport-McMoran Copper & Gold (FCX)	March 1998	32.36%
Zebra Technologies (ZBRA)	March 1998	31.62%
Oracle (ORCL)	March 1998	28.5%
Royal Caribbean Cruises (RCL)	March 1998	27.95%
Advanced Micro Devices (AMD)	March 1998	23.67%
Lennar (LEN)	March 1998	23.27%
Dollar Tree (DLTR)	March 1998	22.4%
ANSYS (ANSS)	March 1998	21.36%
Hologic (HOLX)	March 1998	20%
Mohawk Industries (MHK)	March 1998	20%
AES (AES)	March 1998	19.86%
Public Service Enterprise (PEG)	March 1998	19.73%
FactSet Research Systems (FDS)	March 1998	19.67%
CarMax (KMX)	March 1998	19.23%
Lowe's Companies (LOW)	March 1998	19.21%
NetApp (NTAP)	March 1998	18.34%
Carnival (CCL)	March 1998	17.97%
Cintas (CTAS)	March 1998	17.61%
Caesars Entertainment (CZR)	March 1998	17.5%
Capital One Financial (COF)	March 1998	17.29%
TJX Companies (TJX)	March 1998	17.2%
Stanley Black & Decker (SWK)	March 1998	17.08%
Westinghouse Air Brake Technologies (WAB)	March 1998	16.83%