His Gibralta-based Thames Sports Investment company has acquired an initial 51% stake in the club for around £25 million.
The process was finally ratified by the Premier League and Football League earlier today following weeks of investigations into the 30-year-old Russian's background.
Zingarevich, who eventually wants full control of the club, has now joined the Reading FC board along with TSI's Christopher Samuelson and Andrew Obolensky plus Royals chief executive Nigel Howe.
Sir John Madejski will remain as chairman of the board, while Ian Wood-Smith stays on as another director.
The takeover will give manager Brian McDermott the green light to bolster his squad this summer following rumours of a failed £2 million bid for Nottingham Forest defender Chris Gunter recently.
WHAT DO YOU THINK ABOUT THE TSI TAKEOVER? LEAVE A COMMENT BELOW.