One customer is making changes and causing PubMatic to miss its mark.Shares of programmatic advertising technology (adtech) company PubMatic (PUBM -30.25%) were crushed on Friday after the company reported financial results for the second quarter of 2024. As of 11 a.m. ET, PubMatic stock was down a painful 30%.Why the market disliked PubMatic's quarterIn my opinion, Q2 results weren't so bad for PubMatic. But allow me to acknowledge why investors are dumping this stock today. Management had guided for Q2 re ...