MUMBAI: Existing shareholders in 4 firms are planning to promote their stakes by means of block trades on Wednesday, aiming to mobilise about Rs 3,500 crore, sources stated. Private fairness main TPG is promoting its total 2.1% stake in Tata Technologies, which might fetch about Rs 630 crore. Through one other block commerce, CA Dawn Investments, an arm of one other PE main Carlyle, is providing to promote 10.2% in Indegene to mop up about Rs 1,400 crore. Flipkart Investments is promoting about 6% in Aditya Birla Fashion & Retail, eyeing about Rs 580 crore. Through one other block, Jayanti Sinha, one of many promoters of Alkem Laboratories, is promoting 1.4% within the firm to mop up about Rs 825 crore.