Jack Kellogg is an American day trader from New Hampshire who built his career trading penny stocks and small caps. Straight out of high school, skeptical of college, he saved roughly $10,000 from a valet job and joined Timothy Sykes' Trading Challenge in 2017. After nearly quitting early on following a heavy loss, he found consistency and, in 2020, became Sykes' youngest millionaire student.

His publicly tracked trades on Profit.ly document a career-profit figure that has grown into the seven figures, and he now works as one of the lead mentors in the Trading Challenge while running his own education under the Seven-Figure Cycles course and his company, Moon Equities. In recent years he has expanded into real estate investing. Kellogg is known for a disciplined, risk-first approach: small position sizing, fast exits, and repeatable chart patterns rather than big single bets.