An investment group led by Silver Lake co-CEO Egon Durban is purchasing a 25 percent stake in the Las Vegas Raiders, Bloomberg News reported Thursday. Durban and his group already own 11 percent of the Raiders and were in line to land another 3.5 percent this year. Durban has the right of first refusal to buy the controlling stake in the team should majority owner Mark Davis decide to sell. The group led by Durban will own nearly 40 percent of the Raiders once the deal is finalized, Davis, who will remain controlling owner, according to Bloomberg, citing unnamed sources. The deal has been approved by the NFL’s finance committee and will be up for vote by other team owners at next week’s spring league meetings in Orlando, Bloomberg reported. The 25 percent stake being sold is coming from Raiders minority investors and not from Davis, who will remain controlling owner, according to the report. It is unclear which minority owners put their shares in the team for sale.…