S&P 500 Index (SP500)

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Apple (AAPL) - has 3.4 component's weighting in the S&P 500, Microsoft (MSFT) - has 2.4. The top stocks with highest impact on the S&P 500 trend would be:
Apple Inc. (AAPL) - 3.454514
Microsoft Corporation (MSFT) - 2.476262
Exxon Mobil Corporation (XOM) - 1.806482
General Electric Company (GE) - 1.599475
Johnson & Johnson (JNJ) - 1.595228
Wells Fargo & Company (WFC) - 1.440735
Amazon.com Inc. (AMZN) - 1.429393
Berkshire Hathaway Inc. Class B (BRK.B) - 1.395743
JPMorgan Chase & Co. (JPM) - 1.363343
Facebook Inc. (FB) - 1.333700
Alphabet Inc. (GOOG) - 1.240467

However, when you take a look at the performance of these companies, they yield greatly to the much smaller companies. See below top 10 S&P 500 performance over the past 6 months:
CONSOLIDATED ENERGY (CNX) - 99.48 %
NRG ENERGY (NRG) - 98.33 %
SOUTHWESTERN ENERGY (SWN) - 96.12 %
ONEOK (OKE) - 85.20 %
JOY GLOBAL (JOY) - 74.69 %
NEWMONT MINING (NEM) - 70.58 %
COMPUTER SCIENCES (CSC) - 69.30 %
RANGE RESOURCES (RRC) - 66.71 %
WYNN RESORTS (WYNN) - 56.80 %
CABOT OIL & GAS (COG) - 48.34 %

The best performed S&P 500 stocks in 2016 with the strongest YTD performance would be
SOUTHWESTERN ENERGY (SWN) - 113.36 %
CONSOLIDATED ENERGY (CNX) - 94.30 %
NEWMONT MINING (NEM) - 93.94 %
RANGE RESOURCES (RRC) - 87.73 %
ONEOK (OKE) - 86.24 %
JOY GLOBAL (JOY) - 77.38 %
FREEPORT-MCMORAN (FCX) - 65.98 %
COMPUTER SCIENCES (CSC) - 58.69 %
NRG ENERGY (NRG) - 51.70 %
WYNN RESORTS (WYNN) - 46.15 %

The best companies over the past month on the S&P 500 would be
COMPUTER SCIENCES (CSC) - 54.26 %
WESTERN DIGITAL (WDC) - 33.51 %
NVIDIA (NVDA) - 31.25 %
MICRON TECH (MU) - 30.63 %
SEAGATE TECH (STX) - 29.31 %
SOUTHWESTERN ENERGY (SWN) - 28.50 %
ALLERGAN (AGN) - 23.90 %
DEVON ENERGY (DVN) - 23.79 %
APPLIED MATERIALS (AMAT) - 21.64 %
MARATHON OIL (MRO) - 1.45 %

And past week best performers on the S&P 500 were
JOY GLOBAL (JOY) - 34.89 %
MICHAEL KORS HOLDINGS (KORS) - 21.46 %
TRANSOCEAN (RIG) - 16.46 %
SOUTHWESTERN ENERGY (SWN) - 15.85 %
CF INDUSTRIES HOLDINGS (CF) - 15.05 %
ENDO PHARMACEUTICALS HOLDINGS (ENDP) - 14.95 %
CHESAPEAKE ENERGY (CHK) - 14.42 %
SEAGATE TECH (STX) - 13.99 %
MOSAIC (MOS) - 13.43 %
ENSCO (ESV) - 12.96 %

Source:
http://www.marketvolume.com/stocks/winnerslosers.asp

The one may ask what it (the lists above) - may give us? Despite heavy bragging in the media, we do not see the market giants like AMZN, AAPL, GOOG, MSFT in the list of the best performed stocks. Instead we have second level of the S&P 500 companies moving up strongly. Maybe the "market giants" exhausted their potential for a while and there are not a lot of room them to run up. Maybe it is a time to look into other S&P 500 companies with higher growth potential.