CECO Environmental (CECO) had the highest return between 1984 and 1986 by a US stock in the Nasdaq Composite (IXIC), returning 423.8%.

ASSET	YEARS	% RETURN
CECO Environmental (CECO)	1984-1986	423.8%
Westamerica Bancorporation (WABC)	1984-1986	377.31%
United Fire (UFCS)	1984-1986	356.04%
Paychex (PAYX)	1984-1986	350.08%
Escalade (ESCA)	1984-1986	324.22%
Crown Crafts (CRWS)	1984-1986	300.04%
Reading International (RDI)	1984-1986	299.07%
Weyco (WEYS)	1984-1986	284.85%
Village Super Market (VLGEA)	1984-1986	273.17%
Autodesk (ADSK)	1984-1986	217.53%
Amgen (AMGN)	1984-1986	203.47%
Caseys General Stores (CASY)	1984-1986	202.58%
Gyrodyne Company of America (GYRO)	1984-1986	192.31%
CVB Financial (CVBF)	1984-1986	182.07%
First Financial Bancorp (FFBC)	1984-1986	181.93%
Seneca Foods Corp B (SENEB)	1984-1986	180%
Trustmark (TRMK)	1984-1986	169.16%
Washington Federal (WAFD)	1984-1986	168.94%
United States Lime & Minerals (USLM)	1984-1986	168.39%
Kelly Services A (KELYA)	1984-1986	168.18%
Educational Development (EDUC)	1984-1986	166.92%
Middlesex Water (MSEX)	1984-1986	163.67%
Superior Uniform (SGC)	1984-1986	161.98%
Fifth Third Bancorp (FITB)	1984-1986	160.3%
JB Hunt Transport Services (JBHT)	1984-1986	153.67%