The Mariners claimed Kingham off waivers from the Rangers on Monday.
Kingham made his major-league debur earlier this month for the Rangers before being designated for assignment. He's now joined a new 40-man roster but will report to Triple-A Tacoma. Kingham holds a 6.99 ERA and 44:17 K:BB over 46.1 innings at the Triple-A level in 2026.