Corporate developments dominated the week's stock moves. MongoDB plunged 18.5% on Monday and was on course to finish the week down about 14.7% after President and CEO Chirantan Desai resigned immediately to lead a new AI initiative at Meta Platforms. Former chief executive Dev Ittycheria returned as interim CEO while MongoDB searches for a permanent replacement, and the company reaffirmed its third-quarter and full-year guidance. Synopsys surged 12.8% Thursday and gained about 9.2% for the week after setting fiscal 2027 targets of $11.1 billion to $11.2 billion in revenue, alongside margin, earnings and cash-flow goals. Mattel jumped 18.8% Thursday and was headed for a 13.6% weekly gain after reports that Authentic Brands Group had privately discussed a potential offer valuing the toy maker at more than $20 per share, or at least $6 billion. Nike fell 5.3% for the week to its lowest level since 2013 after mixed fiscal first-quarter results, while Fair Isaac dropped 22.7% after a report that the Federal Housing Finance Agency plans to require lenders to use data from two of the three major credit bureaus for mortgages sold to Fannie Mae and Freddie Mac.