NEW YORK (AP) — U.S. stocks are rallying Monday, as Wall Street claws back some of its sharp and sudden September losses. The S&P 500 was 1.5% higher in late morning trading, following up on its first four-week losing streak in more than a year. Momentum has been ultra-quick to shift recently, though, and the market has had several early gains quickly vanish. The S&P 500′s gain for Monday has veered between 1% and 1.8%. Several companies announced big mergers and acquisitions, which helped to push markets higher. Big Tech stocks were also rebounding from their sharp September drops.