Bradley A. Keywell and three affiliated entities filed Amendment No. 2 to a Schedule 13G with the SEC on October 28, 2026, disclosing beneficial ownership of 6,071,744 shares of Class A Common Stock in Tempus AI, Inc., representing 3.46% of the class as of June 18, 2025, the date of the triggering event.

Key Highlights

  • Total beneficial ownership: Bradley A. Keywell reported aggregate beneficial ownership of 6,071,744 shares of Tempus AI Class A Common Stock, par value $0.0001 per share.
  • Percent of class: The 6,071,744 shares represent 3.46% of the class, based on 175,390,967 shares outstanding as of July 24, 2026.
  • Voting and dispositive power: Keywell holds 0 shares with sole voting or dispositive power; all 6,071,744 shares are held with shared voting and shared dispositive power.
  • Three affiliated entities reported separately: BK TL21 LLC reported 2,213,198 shares (1.26%); The Keywell Foundation Inc reported 357,900 shares (0.02%); Churchill Investments 21 LLC reported 3,305,486 shares (1.88%).
  • Indirect holding structure: According to the filing, shares are held indirectly through a grantor retained annuity trust (195,160 shares), The Keywell Foundation Inc, BK TL21 LLC, and Churchill Investments 21 LLC.
  • Filing event date: The date of the event requiring this filing is listed as June 18, 2025.

Keywell's Stake in Tempus AI Held Across Four Reporting Persons

According to the Schedule 13G Amendment No. 2 filed October 28, 2026, Bradley A. Keywell, a United States citizen, is the central reporting person in this disclosure covering Class A Common Stock of Tempus AI, Inc. (CUSIP 71535D106). The filing identifies three co-reporting entities: BK TL21 LLC, a Delaware limited liability company of which Keywell is the sole member and manager; The Keywell Foundation Inc, a Delaware corporation of which he is President; and Churchill Investments 21 LLC, a Delaware limited liability company for which Keywell serves as managing member of the managing member.

The filing states that Keywell holds the shares "indirectly through (i) a grantor retained annuity trust (195,160 shares); (ii) The Keywell Foundation, Inc. ... (iii) BK TL21 LLC ... and Churchill Investments 21 LLC." BK TL21 LLC holds its 2,213,198 shares directly with sole voting and dispositive power. The Keywell Foundation Inc holds its 357,900 shares directly, with Keywell exercising sole voting and dispositive power as President. Churchill Investments 21 LLC holds its 3,305,486 shares directly, with Keywell holding shared voting and dispositive control by virtue of his role. The percentage calculations in the filing are based on 175,390,967 shares of Class A Common Stock outstanding as of July 24, 2026, as reported in Tempus AI's Quarterly Report on Form 10-Q filed July 30, 2026.

The filing discloses ownership of 5% or less of the class, and Item 6 (ownership on behalf of another person) and Item 7 (subsidiary identification) are both listed as not applicable. All four reporting persons share the same principal business address: 718 Thompson Lane #108-274, Nashville, TN 37204. The filing was signed by Keywell on behalf of himself and all three entities on October 28, 2026.

What Was Disclosed

Bradley A. Keywell and three affiliated entities filed an amended Schedule 13G disclosing aggregate beneficial ownership of 6,071,744 shares of Tempus AI Class A Common Stock, equal to 3.46% of the class, held indirectly through a trust and three legal entities.