Apple, Alphabet and Amazon stock rallies ahead of earnings are adding a total of more than $230 billion to their market caps

Shares of the three technology behemoths reporting quarterly results after the closing bell are surging in afternoon trading Thursday, enough to boost their collective market capitalizations by about $233 billion. Apple Inc.’s stock
AAPL,
+3.71%
is surging 3.3% toward a 2 1/2-month high, Alphabet Inc.’s stock
GOOGL,
+7.28%

GOOG,
+7.27%
is running up 6.4% toward a five-month high and Amazon.com Inc. shares
AMZN,
+7.38%
are hiking up 6.8% toward d 3 1/2-month high. All the stock are outperforming the S&P 500
SPX,
+1.47%,
which is rallying 1.3%. Based on the companies’ share counts reported in their previous audited quarterly filings with the Securities and Exchange Commission, the stocks’ price gains are boosting the market caps of Apple by $77.00 billion, Google-parent Alphabet by $82.96 billion and Amazon by $73.04 billion.