Facebook (NasdaqGS: FB) and Qualcomm (NasdaqGS: QCOM) report Wednesday followed by Amazon (NasdaqGS: AMZN) on Thursday. All are top-10 holdings in QQQ and combine for almost 10% of the fund’s weight.

Then there is the avalanche of earnings from the Nasdaq Biotechnology Index this week. More than 40% of that index’s weight reports over the coming days, including Gilead Sciences (NasdaqGS: GILD), Biogen Idec (NasdaqGS: BIIB), Illumina (NasdaqGS: ILMN), Celgene (NasdaqGS: CELG) and Pharmaceuticals (NasdaqGS: ALXN). [Big Week for Big Biotech ETF]

Those are five of 14 health care stocks held by QQQ. The sector is the ETF’s third-largest at a weight of 13.6%.

PowerShares QQQ

Tom Lydon’s clients own shares of Amazon, Apple, Facebook, Microsoft and QQQ.