Hormel Foods (HRL) had the highest return in April 1985 by a large-cap US stock, returning 106.5%.

ASSET	MONTH	% RETURN
Hormel Foods (HRL)	April 1985	106.48%
Unilever PLC ADR (UL)	April 1985	73.58%
BHP (BHP)	April 1985	27.71%
Tyson Foods (TSN)	April 1985	21.99%
Shell PLC ADR (SHEL)	April 1985	20.6%
Bank of New York Mellon (BK)	April 1985	19.73%
UnitedHealth (UNH)	April 1985	19.53%
Franklin Resources (BEN)	April 1985	18.84%
Honeywell International (HON)	April 1985	17.11%
Valero Energy (VLO)	April 1985	15.59%
PNC Financial Services (PNC)	April 1985	14.9%
Huntington Bancshares (HBAN)	April 1985	13.08%
Arthur J Gallagher (AJG)	April 1985	12.92%
West Pharmaceutical Services (WST)	April 1985	12.18%
Amgen (AMGN)	April 1985	11.35%
Nike (NKE)	April 1985	11.11%
Telefonaktiebolaget LM Ericsson B ADR (ERIC)	April 1985	10.88%
Atmos Energy (ATO)	April 1985	10.84%
US Bancorp (USB)	April 1985	10.79%
Dycom Industries (DY)	April 1985	10.26%
Heico (HEI)	April 1985	9.76%
Fifth Third Bancorp (FITB)	April 1985	9.69%
TJX Companies (TJX)	April 1985	9.57%
Modine Manufacturing (MOD)	April 1985	9.46%
Progressive (PGR)	April 1985	9.43%

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