* Switzerland seeks new requirements on Credit Suisse, UBS
* Microsoft lower after Goldman downgrade
* Sanofi launches Genzyme bid
* Futures down: Dow 47 pts, S&P 4.6 pts, Nasdaq 10.5 pts
By Ryan Vlastelica
NEW YORK, Oct 4 (Reuters) - U.S. stock index futures were lower on Monday after Swiss plans to tighten banking rules weighed on regional markets ahead of a new round of U.S. data.
* Switzerland will seek rules to require global banks UBS AG and Credit Suisse to hold more top-quality capital. The potential regulations, stricter than international standards, could crimp the banks' competitiveness in investment banking.
* U.S.-listed shares of Credit Suisse were off 0.3 percent to $43.13 in premarket trading, while UBS was unchanged at $17.13. The FTSEurofirst 300 index of top shares was down 0.4 percent.
* Concerns about Europe's banking system have been a headwind for U.S. stocks in recent months, even as some improving domestic data eased concerns over a possible double-dip recession.
* Monday's economic data includes pending home sales, durable good orders and factor orders, all for August. Home sales are seen rising 3 percent after rising 5.2 percent in the previous month. The closely watched non-farm payrolls report for September will be released on Friday, and could offer insight into the weak U.S. labor market.
* S&P 500 futures fell 4.6 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures fell 47 points, and Nasdaq 100 futures lost 10.5 points.
* Dow component Microsoft Corp fell 2 percent to $23.90 in premarket trading after Goldman Sachs downgraded the stock to "neutral," in part citing competition from tablet computers.
* French drugmaker Sanofi-Aventis SA launched a hostile bid for Genzyme Corp at $69 per share, taking its offer directly to shareholders after the biotechnology company refused to negotiate.
* Also in deal news, Microsemi Corp, a maker of power management semiconductors, will buy integrated circuit manufacturer Actel Corp for about $430 million. Actel surged 28 percent to $20.50 in light premarket action.
* While no S&P 500 companies were on tap to report results on Monday, this week will mark the unofficial start of the third-quarter reporting season, with Alcoa Inc due on Thursday. Micron Technology Inc, PepsiCo Inc and Monsanto Co are all set to report this week.
* Wall Street extended a rally on Friday, led by gains in natural resource stocks after data in China showed a pickup in manufacturing activity.