shares of alleghany corp jumped nearly 25 in premarket trading monday after the insurer agreed to be acquired by berkshire hathaway inc for about 116 billion alleghany investors will receive 84802 a share in cash a roughly 25 premium to fridays closing price of 67675 and nearly 15 above the stocks 52week high of 73789 reached last may the purchase price is also just above the alltime high of 84795 alleghanys share price hit in february 2020 alleghany shares were recently changing hands at 84478 in light premarket trade