The 49ers waived Speaks on Sunday, Matt Maiocco of NBC Sports Bay Area reports.
The Giants signed Speaks to a reserve/future contract Thursday, Zack Rosenblatt of The Newark Star-Ledger reports.
The Raiders signed Speaks to the practice squad Friday.
The Chiefs waived Speaks on Sunday.
The Chiefs placed Speaks (knee) on season-ending injured reserve Saturday, BJ Kissel of the Chiefs' official site reports.
Speaks (knee) was diagnosed with a sprained MCL and a meniscus injury and will undergo surgery this week, BJ Kissel of the Chiefs' official site reports.
Speaks suffered a knee injury during Saturday's game against the Steelers.
The Chiefs selected Speaks in the second round of the 2018 NFL Draft, 46th overall.