Laboratory Corporation of America (LH) had the highest return between 1986 and 1990 by a US stock, returning 4,310,060%.

ASSET	YEARS	% RETURN
Laboratory Corporation of America (LH)	1986-1990	4,310,060%
Nike (NKE)	1986-1990	18,923.26%
Aegon NV ADR (AEG)	1986-1990	6,691.3%
US Bancorp (USB)	1986-1990	2,034.91%
PLDT Inc ADR (PHI)	1986-1990	1,566.05%
Bridgford Foods (BRID)	1986-1990	1,512.06%
Barrick Gold (GOLD)	1986-1990	1,237.47%
Crown Crafts (CRWS)	1986-1990	1,127.04%
Microsoft (MSFT)	1986-1990	1,080.15%
Adobe Systems (ADBE)	1986-1990	1,005.87%
Badger Meter (BMI)	1986-1990	968.48%
Altria (MO)	1986-1990	945.24%
Home Depot (HD)	1986-1990	927.31%
Amgen (AMGN)	1986-1990	830.81%
Weatherford International (WFRD)	1986-1990	761.54%
Telefonaktiebolaget LM Ericsson B ADR (ERIC)	1986-1990	729.7%
Arts-Way Manufacturing (ARTW)	1986-1990	701.8%
Argan (AGX)	1986-1990	677.77%
MDU Resources (MDU)	1986-1990	616.15%
Jacobs Solutions (J)	1986-1990	601.28%
Natures Sunshine Products (NATR)	1986-1990	600.49%
Cracker Barrel Old Country Store (CBRL)	1986-1990	588.32%
HF Sinclair (DINO)	1986-1990	522.45%
Telephone and Data Systems (TDS)	1986-1990	513.78%
Oceaneering International (OII)	1986-1990	487.49%