Equities research firm Wall Street Zen downgraded MongoDB (NASDAQ: MDB) from a "buy" rating to a "hold" rating on Saturday, October 18, 2025. In other news on the same day, a Form 13F filing with the Securities and Exchange Commission revealed that Callan Family Office LLC purchased a new stake in MongoDB during the second quarter, acquiring 1,040 shares valued at approximately $218,000. There was no significant market reaction analysis available in the immediate reports.