Campbell’s (CPB) had the highest return in April 1989 by a US stock in the S&P 500 (GSPC), returning 27.2%.

ASSET	MONTH	% RETURN
Campbell’s (CPB)	April 1989	27.17%
Thermo Fisher Scientific (TMO)	April 1989	24.39%
Valero Energy (VLO)	April 1989	21.56%
Adobe Systems (ADBE)	April 1989	20.22%
Oracle (ORCL)	April 1989	20.19%
Tyler Technologies (TYL)	April 1989	19.55%
Applied Materials (AMAT)	April 1989	19.34%
Lam Research (LRCX)	April 1989	19.28%
Expeditors International of Washington (EXPD)	April 1989	19.08%
Williams-Sonoma (WSM)	April 1989	17.39%
Devon Energy (DVN)	April 1989	16.67%
APA (APA)	April 1989	15.28%
Tyson Foods (TSN)	April 1989	15.25%
West Pharmaceutical Services (WST)	April 1989	14.69%
NiSource (NI)	April 1989	14.48%
Stryker (SYK)	April 1989	14.14%
Charles Schwab (SCHW)	April 1989	14.02%
Raytheon Technologies (RTX)	April 1989	13.67%
Analog Devices (ADI)	April 1989	13.25%
Costco Wholesale (COST)	April 1989	13.19%
Cardinal Health (CAH)	April 1989	12.98%
ONEOK (OKE)	April 1989	12.64%
W R Berkley (WRB)	April 1989	12.61%
Clorox (CLX)	April 1989	12.59%
Cincinnati Financial (CINF)	April 1989	12.14%