Tata Technologies, a part of the Tata Group, is in talks with Morgan Stanley Investment Management, Blackrock, and U.S hedge funds for its upcoming initial public offering (IPO) at a valuation of $2.5 billion. The company, which provides engineering services for the auto and aerospace sectors, is discussing possible participation in the IPO with asset managers Ghisallo Capital, Oaktree Capital, Key Square Capital, and others. The IPO is expected to open for subscriptions on November 21 and could be one of India's biggest IPOs this year.