Stocks Add to Gains After Manufacturing Data By: CNBC.com News October 01, 2012 at 10:04 AM EDT Stocks extended their gains Monday, with the Dow and S&P 500 rallying nearly 1 percent, as Wall Street cheered a better-than-expected ISM manufacturing report. Read More >> Related Stocks: 3M Co Bank of America Citigroup Goldman Sachs Group Hewlett-Packard Nokia Corp ADR