We construct two types of trading shocks and examine their effects on stock prices. Common shocks capture the shared trading activity across funds, whereas granular idiosyncratic shocks place emphasis on large players. Common shocks related to stock sales exhibit a significantly stronger price impact than those related to purchases, in contrast to symmetric effects of purchases and sales for granular idiosyncratic shocks. The initial price impact persists in the short run and partially reverses after six months, suggesting underreaction to institutional trading. Our results underscore the impact of the common component across various funds on asset prices and market efficiency.