April 12 (Reuters) - Private equity firm GTCR is nearing a deal to buy OSTTRA for about $3.2 billion, Bloomberg News reported on Saturday citing people familiar with the matter.

The deal could be announced as early as next week, the report said.

GTCR and OSTTRA did not immediately respond to Reuters requests for comment.

Derivatives exchange CME Group CME.O and financial information company S&P Global SPGI.N were weighing a sale of joint venture OSTTRA, Bloomberg News had reported last year.

OSTTRA, a post-trade services company, was launched by CME and analytics firm IHS Markit in September 2021.

Chicago, Illinois-based private equity firm GTCR has invested more than $30 billion in over 280 companies, and the firm currently manages $40 billion in equity capital.

(Reporting by Devika Nair in Bengaluru; Editing by Susan Fenton)

((Devika.MadhusudhananNair@thomsonreuters.com;))