Money manager BlackRock and mutual fund managers the Vanguard Group and Fidelity are among six Western institutional investors who—if their holdings have remained the same since the first quarter—will have lost some $15 billion collectively in some of the biggest U.S.-listed China tech stocks that have tumbled in the wake of Beijing’s regulatory crackdown.

Overall, the Chinese tech stock selloff in recent weeks has wiped out $1 trillion in market value. If these investors’ holdings haven’t changed in the four months since their most recent public stockholding disclosure at the end of the first quarter, the firms will have lost an average of $2.5 billion each, as the above chart shows. It couldn’t be learned whether these investors have sold some stock since that time.