Take-Two Interactive Software (TTWO) had the highest return in April 1997 by a large-cap US stock, returning 37.5%.

ASSET	MONTH	% RETURN
Take-Two Interactive Software (TTWO)	April 1997	37.5%
Microsoft (MSFT)	April 1997	34.81%
STERIS (STE)	April 1997	34.36%
Stryker (SYK)	April 1997	32.83%
Synopsys (SNPS)	April 1997	32.81%
Best Buy (BBY)	April 1997	31.7%
Tower Semiconductor (TSEM)	April 1997	31.58%
Essential Utilities (WTRG)	April 1997	28.01%
Gartner (IT)	April 1997	25.75%
Lattice Semiconductor (LSCC)	April 1997	25.56%
T Rowe Price (TROW)	April 1997	24.58%
Southwest Airlines (LUV)	April 1997	23.59%
KLA-Tencor (KLAC)	April 1997	23.18%
Monster Beverage (MNST)	April 1997	22.12%
Applied Materials (AMAT)	April 1997	21.27%
Koninklijke Philips NV ADR (PHG)	April 1997	21.25%
SPX (SPXC)	April 1997	20.38%
Progressive (PGR)	April 1997	20.35%
Texas Instruments (TXN)	April 1997	19.2%
Northern Trust (NTRS)	April 1997	18.67%
Quest Diagnostics (DGX)	April 1997	18.49%
Analog Devices (ADI)	April 1997	18.23%
Parker-Hannifin (PH)	April 1997	17.75%
STMicroelectronics NV ADR (STM)	April 1997	17.19%
International Business Machines (IBM)	April 1997	17.15%

Large-cap stocks are treated as having a market cap of $10B+.