Amkor Technology (AMKR) had the highest return in April 2006 by a large-cap US stock, returning 39%.

ASSET	MONTH	% RETURN
Amkor Technology (AMKR)	April 2006	38.97%
Illumina (ILMN)	April 2006	33.46%
Tenaris SA ADR (TS)	April 2006	26.11%
Carpenter Technology (CRS)	April 2006	24.53%
DexCom (DXCM)	April 2006	23.27%
AXIA Energia (AXIA)	April 2006	23.07%
ASE Industrial Holding Co Ltd ADR (ASX)	April 2006	21.71%
Coherent (COHR)	April 2006	19.8%
Agnico Eagle Mines (AEM)	April 2006	19.06%
Centrais Electricas Brasileiras (EBR)	April 2006	18.95%
Alamos Gold (AGI)	April 2006	18.94%
Old Dominion Freight Line (ODFL)	April 2006	18.9%
Comcast (CMCSA)	April 2006	17.9%
Baker Hughes (BKR)	April 2006	17.31%
RBC Bearings (RBC)	April 2006	15.96%
Southern Copper (SCCO)	April 2006	15.54%
Petroleo Brasileiro Petrobras SA ADR (PBR)	April 2006	14.68%
Las Vegas Sands (LVS)	April 2006	14.38%
Invesco (IVZ)	April 2006	14.15%
Gold Fields Ltd ADR (GFI)	April 2006	13.95%
Honda Motor Co Ltd ADR (HMC)	April 2006	13.92%
Hartford Financial Services (HIG)	April 2006	13.59%
Micron Technology (MU)	April 2006	13.59%
Brookfield (BN)	April 2006	13.48%
Lam Research (LRCX)	April 2006	13.33%

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