Stay informed with free updatesSimply sign up to the Private equity myFT Digest -- delivered directly to your inbox.Cybersecurity specialist SailPoint’s initial public offering is poised to hand investors a multibillion-dollar windfall from a private equity deal struck at the height of a record wave of takeovers in 2021 and 2022.US private equity group Thoma Bravo stands to make more than $4bn from the IPO, which is expected to value the Texas-based company at more than $12bn.The sum would repre...