Tenable has announced plans to acquire Microsoft Active Directory (AD) security provider Alsid for $98 million in cash. Furthermore, Alsid founders Emmanuel Gras and Luc Delsalle will join Tenable in senior leadership roles focused on the development of AD security solutions.This is M&A deal number 104 that MSSP Alert and sister site ChannelE2E have covered so far in 2021. See all technology M&A deals for 2021 and 2020 listed here.The Alsid acquisition is expected to close in the second quarter, Tenable said. Alsid’s financial results in 2021 are expected to contribute approximately 1 percentage point of growth to Tenable's revenue, and its calculated current billings and incremental operating expenses are projected to fall between $15 million and $20 million.Alsid offers a SaaS solution that lets users monitor AD security in real time, the company indicated. The solution provides dynamic threat scoring, complexity ratings and recommended actions to help users identify and repair AD security weaknesses. In addition, Alsid's solution continuously discovers new AD attack pathways and detects ongoing attacks in real time, the company stated. It also provides remediation recommendations without requiring users to deploy agents or access privileged accounts.