Mullin Consulting Inc. and TBG Financial Inc. are combining to form MullinTBG.
Mullin, Chicago, and TBG, Los Angeles, are both executive benefits firms.
The combined firm, which will be based in Los Angeles, will employ more than 300 executive benefits specialists.
The specialists will administer more than 400 nonqualified benefit plans with $15 billion in assets and about 50,000 participants.
The merging companies say the combined firm will continue to sell executive benefits services and products.