Devon Energy (DVN) had the highest return in February 1989 by a large-cap US stock, returning 43.6%.

ASSET	MONTH	% RETURN
Devon Energy (DVN)	February 1989	43.59%
Fair Isaac (FICO)	February 1989	30.53%
UnitedHealth (UNH)	February 1989	27.49%
Ross Stores (ROST)	February 1989	20.46%
Skyworks Solutions (SWKS)	February 1989	20%
Newmont Goldcorp (NEM)	February 1989	16.24%
Monster Beverage (MNST)	February 1989	15.08%
MGM Resorts International (MGM)	February 1989	15%
Kinross Gold (KGC)	February 1989	14.29%
Universal Health Services (UHS)	February 1989	13.33%
Gold Fields Ltd ADR (GFI)	February 1989	12.37%
Home Depot (HD)	February 1989	12.11%
Bank of America (BAC)	February 1989	11.75%
Micron Technology (MU)	February 1989	10.64%
Progressive (PGR)	February 1989	10.26%
KLA-Tencor (KLAC)	February 1989	10.21%
Barrick Gold (GOLD)	February 1989	10.19%
Teva Pharma Industries Ltd ADR (TEVA)	February 1989	9.8%
Lockheed Martin (LMT)	February 1989	9.6%
Agnico Eagle Mines (AEM)	February 1989	9.58%
Thermo Fisher Scientific (TMO)	February 1989	8.81%
Bank of New York Mellon (BK)	February 1989	8.65%
Carlisle Companies (CSL)	February 1989	8.18%
Expeditors International of Washington (EXPD)	February 1989	7.7%
Jefferies Financial (JEF)	February 1989	7.5%

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