Telephone & Telegraph Co. announced Monday would rank as the 5th largest in US history if completed.

Here are the other top mergers, showing target name, acquirer name, date of completion and value in dollars.

1. RJR Nabisco Inc., merger with Kohlberg Kravis Roberts & Co., completed April 28, 1989, $30.6 billion.

2. Warner Communications Inc., merger with Time Inc., January 10, 1990, $14.11 billion.

3. Kraft Inc., merger with Philip Morris Inc., December 7, 1988, $13.44 billion.

4. Gulf Corp., merger with Standard Oil Co. of California, June 15, 1984, $13.4 billion.

5. Squibb Corp., merger with Bristol-Myers Co., October 4, 1989, $12.09 billion.

6. Getty Oil Co., merger with Texaco Inc., February 17, 1984, $10.12 billion.

7. SmithKline Beckman Corp., merger with Beecham Grop PLC, July 26, 1989, $7.92 billion.

8. NCR Corp., merger with American Telephone & Telegraph Co., September 19, 1991, $7.89 billion.

9. Standard Oil Co., acquired by British Petroleum, July 7, 1987, $7.86 billion.

10. Conoco Inc., merger with DuPont Co., September 30 1981, $7.57 billion.