GSK to acquire US-based biopharma company RAPT Therapeutics via a $2.2 billion deal — Details here by Live mint | January 20, 2026 3:12 pm | Indian Stocks, Market, News British biopharma major GSK to acquire US-based biopharma company RAPT Therapeutics via a $2.2 billion deal. Here’s what investors need to know about the update, which is expected to close by first quarter of 2026.