[14] In September 2018, Ryan LLC became a founding member of the Massachusetts Institute of Technology's FINTECH @ CSAIL initiative.

[22][23] Ryan LLC acquired EnerTax Consultants to expand its severance tax practice in September 2015.

[26] In March 2017, Ryan LLC purchased land at the Legacy West development in Plano, Texas.

[28] In October 2018, Onex Corporation acquired a 42 percent interest in Ryan LLC, which valued the company at $1.1 billion.

[29] In December 2018, Ryan LLC acquired Denver-based Economics Partners, a global transfer pricing advisory, controversy and business valuation service.

The same month, Ryan LLC acquired Paris-based VAT Systems, a tax specialty firm.

[30] In November 2020, Ryan, LLC announced the acquisition of Sydney, Australia-based Indirect Tax Solutions (ITS).

[34] Ryan, LLC also announced the acquisition of Burgess Cawley Sullivan (BCS), a property tax consulting and appraisal firm in Vancouver, British Columbia.

[38][39] In July, 2022, Ryan, LLC announced the acquisition of Paradigm DKD Group, L.L.C., an independent national provider of comprehensive property tax management services.

[45] In the 2021-2022 election cycle, the Ryan LLC PAC raised $1.039 million; this included $107,000 contributed to federal campaigns (32.71% to Democrats, 67.29% to Republicans).

Ryan sued GO-Biz shortly after the agency implemented the tax credit ban, alleging the prohibition violates the state of California constitution.