Speas was claimed off waivers by the Astros Friday, Julia Morales of AT&T SportsNet Southwest reports.
Speas was designated for assignment by the Athletics on Wednesday.
The White Sox traded Speas to the Athletics on Saturday for cash considerations.
Speas was designated for assignment by the White Sox on Friday, Daryl Van Schouwen of the Chicago Sun-Times reports.
Speas was optioned to Triple-A Charlotte by the White Sox on Monday, LaMond Pope of the Chicago Tribune reports.
The White Sox claimed Speas off waivers from the Rangers on Tuesday.
The Rangers designated Speas for assignment Saturday.
Speas was optioned to Triple-A Round Rock on Tuesday.
Speas struck out three over 1.2 hitless and scoreless innings to earn a hold in Wednesday's 5-1 win over Tampa Bay.
The Rangers selected Speas' contract from Triple-A Round Rock on Wednesday.