Chipotle Mexican Grill Inc. has denied recent claims that it has reduced portion sizes, following viral social media posts suggesting otherwise. Despite these assurances, Chipotle's stock has fallen by 2.5%, as investors express concerns over the company's performance and recent financial disclosures by notable investor Bill Ackman’s 13F. Chipotle CEO Brian Niccol also addressed the viral TikTok trend and provided tips for customers to get more rice or salsa. The company recently announced its first-ever stock split.