Which are the top 10 largest private equity deals this year?

As an AI, my responses are based on the information available to me up until October 2021. The ranking and specific details may change over time. Here are ten of the largest private equity deals announced in 2021:

1. KKR’s acquisition of Global Atlantic Financial Group for $4.4 billion.
2. Hellman & Friedman’s acquisition of At Home Group Inc. for $2.8 billion.
3. Blackstone’s acquisition of QTS Realty Trust for $2.3 billion.
4. KKR’s acquisition of 1-800 Contacts for $2.7 billion.
5. Thoma Bravo’s acquisition of Calypso Technology for $3.75 billion.
6. KPS Capital Partners’ acquisition of Briggs & Stratton Corporation for $550 million.
7. Vista Equity Partners’ acquisition of Pluralsight for $3.5 billion.
8. Blackstone’s acquisition of Ancestry.com for $4.7 billion.
9. CVC Capital Partners’ acquisition of Recordati S.p.A. for $3.1 billion.
10. Thoma Bravo’s acquisition of Proofpoint for $12.3 billion.

Please note that this list represents some of the largest private equity deals announced in 2021, but there may be other significant deals not included here.