Hewlett-Packard

(HPQ) - Get Report

extended its tender offer for the shares of

Mercury Interactive

(MERQ)

by two weeks until midnight EDT Sept. 28.

The offer was previously set to end at midnight Sept. 14. As of that time, about 67.8 million shares had been tendered.

H-P, which is embroiled in a controversy over secret attempts to gather the phone records of directors and journalists, reached a deal in July to buy Mercury for $52 a share, or about $4.5 billion.

Shares of H-P rose 11 cents to $36.36. Mercury was up 15 cents at $50.85.