http://rostermon.com/teams/sea/transactions/ confirms the cuts and signings.
Taj Williams WR 2018-05-07 Waived
Ka'Raun White WR 2018-05-07 Waived
Brad Lundblade C 2018-05-07 Waived
Jason Hall LB 2018-05-07 Waived
Paul Dawson LB 2018-05-07 Waived
Avery Young OL 2018-05-07 Signed
T.J. Mutcherson S 2018-05-07 Signed
Marcus Henry OL 2018-05-07 Signed
Stringfellow not confirmed yet.
EDIT: and now he is:
Taj Williams WR 2018-05-07 Waived
Ka'Raun White WR 2018-05-07 Waived
Brad Lundblade C 2018-05-07 Waived
Jason Hall LB 2018-05-07 Waived
Paul Dawson LB 2018-05-07 Waived
Avery Young G 2018-05-07 Signed
Damore'ea Stringfellow WR 2018-05-07 Signed
T.J. Mutcherson FS 2018-05-07 Signed
Marcus Henry C 2018-05-07 Signed
Nick Callender T 2018-05-07 Signed