Imperva Inc. announced Wednesday a deal to be acquired by private equity firm Thoma Bravo LLC in a deal valued at $2.1 billion. Imperva's stock was halted for news until 9:50 a.m. ET. Under terms of the deal, Imperva shareholders will receive $55.75 in cash for each Imperva share they own, which is 29.5% above Tuesday's closing price of $43.06, and the highest level seen during regular session hours since July 26. The deal includes a 45-day "go shop" period in which the cybersecurity company may solicit other acquisition proposals.