Private equity firm Thoma Bravo would buy cybersecurity firm Proofpoint for about $10.1 billion.
Cybersecurity industry funding reached an all-time high of $11.4 billion last year, a nearly 50 percent increase from 2018, according to CB Insights.
The offer values Sunnyvale, California-based Proofpoint at about $12.3 billion.
Thoma Bravo has been doubling down on its investments in the software and tech sector. Thoma Bravo has acquired online trading services provider Calypso Technology and data solutions firm Talend in March.