Top Five Firm RSM US LLP has agreed to acquire Padgett Stratemann, the fourth largest local CPA firm in Texas.

Mazars, an international accounting, auditing and tax firm, has signed a deal to acquire Corality Financial Group, a financial modeling consultancy and training course provider with offices in Sydney, London and New York.

Armanino LLP has started a Corporate Finance practice to advise business clients on mergers and acquisitions, along with sales of intellectual property and patents.

WeiserMazars LLP has merged in Risk Management Group, an internal audit service provider in Ladera Ranch, Calif.

Mountjoy Chilton Medley has expanded its footprint in Cincinnati by adding Top 100 firm Elliott Davis Decosimo’s practice in that city.

RGL Forensics, a Denver-based financial investigations company, has added Stahl Forensic and Valuation Experts, a Florida-based forensic accounting and litigation firm, effective July 1.

CliftonLarsonAllen has merged in two firms: Peto & Company CPAs in Tucson, Ariz., and Repanich & Clevenger CPAs in Seattle, Wash., expanding the firm’s presence in both cities.

Grant Thornton’s Hong Kong firm is expanding by merging in Mabel Chan & Co., a firm founded by the vice president of the Hong Kong Institute of CPAs.

Long Island CPA firm Janover LLC’s JRS Financial Services unit has merged in Hagan & Burns CPAs PC.

A recent rereading of “The Rational Optimist” by British author Matt Ridley revived my belief in “cultural optimization” when it comes to accounting firm acquisitions.