Brunswick Group retained its grip as the top global M&A PR advisor in 2015 by number of deals and deal value, representing 209 transactions worth nearly $1T in a year dubbed the biggest for M&A ever.

Brunswick surpassed FTI Consulting (188), Sard Verbinnen & Co (137), Joele Frank (133) and Kekst and Company (124) by deal count, according to mergermarket's league tables.

By value, Brunswicks' nearly $974B total was up 80 percent over the prior year and easily surpassed Joele Frank ($558B), Finsbury ($408B), Kekst ($401B), and Sard Verbinnen ($358B).

Making strong gains by deal value were No. 6 Edelman ( up from No. 17 in 2014 with $299B across 84 deals), No. 9 Tulchan Communications (up from No. 27 with $72.3B and 60 deals), No. 11 Citigate (up from 19 with $41.6B and 87 deals), No. 12 Weber Shandwick (up from 20 with $39.4B and 39 deals, No. 13 Prosek Partners (up from 55 with $30.4B and 36 deals), and No. 14 Hill+Knowlton Strategies (up from 26 with $29B and 23 deals).

Brunswick senior partner Steve Lipin called 2015 a "strong year for M&A as many of our clients engaged in important strategic transactions." He added that 2016 is off to a strong start, as well.

M&A activity in 2015 topped $5B, a record for deals according to Dealogic.