Shares of Twitter Inc. were climbing 5% Wednesday morning. There were about 8.2 million shares trading, compared to the 30-day average volume of 23.6 million shares. Shares have gained 3% week-to-date even after Twitter missed second-quarter revenue expectations on July 26. The S&P 500 has lost 1% in the same time period. In the past three months, Twitter shares have gained 22%, outperforming the S&P 500's 5% gain.
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