Top corporate mergers involving U.S. companies. The values of pending deals are based on Monday's closing stock prices:

1. Exxon Corp. agrees to $77.2 billion merger with Mobil Corp., announced Tuesday. Pending.

2. Bell Atlantic Corp. to merge with GTE Corp. in deal valued at $72.6 billion, announced July 28, 1998. Pending.

3. SBC Communications Inc. announces plan to buy Ameritech Corp. for $69.9 billion in stock on May 11, 1998. Pending.

4. British Petroleum PLC agrees to buy Amoco Corp. for $58.5 billion in stock, announced Aug. 11, 1998. Pending.

5. NationsBank Corp. and BankAmerica Corp. merge in a deal valued at $41.5 billion, completed Sept. 30, 1998.

6. WorldCom Inc. acquires MCI Communications Inc. for $37 billion, completed Sept. 14, 1998.

7. Travelers Group and Citicorp merge in a deal valued at $36.9 billion, completed Oct. 7, 1998.

8 (tie). Daimler-Benz merges with Chrysler Corp. in a stock swap valued at $32.8 billion, completed Nov. 12, 1998.

8 (tie). AT&T Corp. agrees to buy Tele-Communications Inc. for $32.8 billion in stock, announced June 24, 1998. Pending.

10. Wells Fargo & Co. and Norwest Corp. merge in a deal valued at $31.7 billion, completed Nov. 2, 1998.