Invesco Mutual Fund has acquired a 3.5 percent stake in Sahajanand Medical Technologies, a medical devices manufacturer, through open-market transactions on October 23. Meanwhile, Yali Capital has exited newly listed Tonbo Imaging India, while HDFC Mutual Fund, Bajaj Life Insurance and Buoyant Capital have purchased shares in the defence electronics equipment maker. Shares of Sahajanand Medical Technologies made a strong debut on the stock exchanges on Friday, closing at Rs 377.65, up 9.8 percent over the issue price of Rs 344 on the National Stock Exchange (NSE).