Perspective Therapeutics (CATX) had the highest return in April 1987 by a US stock, returning 86.4%.

ASSET	MONTH	% RETURN
Perspective Therapeutics (CATX)	April 1987	86.36%
Valhi (VHI)	April 1987	51.11%
Robert Half International (RHI)	April 1987	47.22%
Astec Industries (ASTE)	April 1987	40%
Applied Materials (AMAT)	April 1987	39.35%
Gencor Industries (GENC)	April 1987	39.03%
McEwen Mining (MUX)	April 1987	38.24%
Cleveland-Cliffs (CLF)	April 1987	37.05%
Crown Crafts (CRWS)	April 1987	35.04%
Adobe Systems (ADBE)	April 1987	34.72%
Micron Technology (MU)	April 1987	33.88%
Super X AI Technology Limited - Ordinary Shares (SUPX)	April 1987	33.33%
Citizens (CIA)	April 1987	29.41%
Oceaneering International (OII)	April 1987	28.12%
Gyrodyne Company of America (GYRO)	April 1987	27.59%
Mesabi Trust (MSB)	April 1987	27.19%
Western Digital (WDC)	April 1987	26.09%
Dorchester Minerals (DMLP)	April 1987	25.87%
Apple (AAPL)	April 1987	25.78%
Teva Pharma Industries Ltd ADR (TEVA)	April 1987	25.71%
Suncor Energy (SU)	April 1987	25.62%
Unisys (UIS)	April 1987	22.94%
Hecla Mining (HL)	April 1987	22.7%
Nabors Industries (NBR)	April 1987	22.22%
Envela (ELA)	April 1987	21.15%