| | LB | Signed (The San Francisco 49ers signed LB Darryl Johnson.) |
| | WR | Waived (The San Francisco 49ers waived WR Shae Wyatt.) |
| | DB | Signed (The San Francisco 49ers signed DB A.J. Parker.) |
| | WR | Released (The San Francisco 49ers released WR Tyron Johnson.) |
| | DL | Signed (The San Francisco 49ers signed DL Marlon Davidson.) |
| | TE | Signed (The San Francisco 49ers signed TE Troy Fumagalli.) |
| | WR | Signed (The San Francisco 49ers signed WR Isaiah Winstead.) |
| | QB | Signed (The San Francisco 49ers signed QB Brandon Allen.) |
| | OL | Signed (The San Francisco 49ers signed OL Corey Luciano.) |
| | RB | Signed (The San Francisco 49ers signed RB Ronald Awatt.) |
| | LB | Signed (The San Francisco 49ers signed LB Mariano Sori-Marin.) |
| | RB | Signed (The San Francisco 49ers signed RB Khalan Laborn.) |
| | OL | Signed (The San Francisco 49ers signed OL Ilm Manning.) |
| | DL | Signed (The San Francisco 49ers signed DL Spencer Waege.) |
| | FB | Signed (The San Francisco 49ers signed FB Jack Colletto.) |
| | WR | Signed (The San Francisco 49ers signed WR Shae Wyatt.) |
| | CB | Signed (The San Francisco 49ers signed DB D'Shawn Jamison.) |
| | S | Signed (The San Francisco 49ers signed DB Avery Young.) |
| | OL | Signed (The San Francisco 49ers signed OL Joey Fisher.) |
| | WR | Re-signed (The San Francisco 49ers re-signed WR Willie Snead IV.) |
| | WR | Signed (The San Francisco 49ers signed WR Chris Conley.) |
| | WR | Re-signed (The San Francisco 49ers resigned WR Jauan Jennings.) |
| | DL | Signed (The San Francisco 49ers signed DE Kerry Hyder Jr.) |
| | WR | Signed (The San Francisco 49ers signed WR Richie James.) |
| | OL | Signed (The San Francisco 49ers signed OL Matt Pryor.) |
| | K | Traded (The Carolina Panthers traded K Zane Gonzalez to the San Francisco 49ers.) From |
| | DL | Signed (The San Francisco 49ers signed DL Austin Bryant.) |
| | TE | Re-signed (The San Francisco 49ers re-signed TE Ross Dwelley.) |
| | DL | Signed (The San Francisco 49ers signed DL Clelin Ferrell.) |
| | CB | Signed (The San Francisco 49ers signed Isaiah Oliver.) |
| | DL | Signed (The San Francisco 49ers signed DT Javon Hargrave.) |
| | QB | Signed (The San Francisco 49ers signed QB Sam Darnold.) From |
| | OL | Signed (The San Francisco 49ers signed OL Jake Brendel.) |
| | DL | Declared Free Agent (DL Kerry Hyder Jr. declared free agency.) |
| | DL | Declared Free Agent (DL Jordan Willis declared free agency.) |
| | DE | Declared Free Agent (DL Samson Ebukam declared free agency.) |
| | CB | Declared Free Agent (DB Emmanuel Moseley declared free agency.) |
| | QB | Declared Free Agent (QB Jimmy Garoppolo declared free agency.) |
| | DE | Declared Free Agent (DL Charles Omenihu declared free agency.) |
| | T | Declared Free Agent (OL Mike McGlinchey declared free agency.) |
| | TE | Declared Free Agent (TE Ross Dwelley declared free agency.) |
| | QB | Declared Free Agent (QB Josh Johnson declared free agency.) |
| | LB | Declared Free Agent (LB Azeez Al-Shaair declared free agency.) |
| | TE | Declared Free Agent (TE Tyler Kroft declared free agency.) |
| | DT | Declared Free Agent (DL Hassan Ridgeway declared free agency.) |
| | OL | Declared Free Agent (OL Daniel Brunskill declared free agency.) |
| | OL | Declared Free Agent (OL Jake Brendel declared free agency.) |
| | DT | Declared Free Agent (DL Maurice Hurst declared free agency.) |
| | CB | Declared Free Agent (DB Jason Verrett declared free agency.) |
| | S | Declared Free Agent (DB Jimmie Ward declared free agency.) |
| | S | Declared Free Agent (DB Tarvarius Moore declared free agency.) |
| | K | Declared Free Agent (K Robbie Gould elected free agency.) |
| | DT | Signed (The Cleveland Browns signed DL Michael Dwumfour to a reserve/future contract.) To |
| | CB | Signed (The San Francisco 49ers signed DB Tre Swilling to a reserve/future contract.) |
| | WR | Signed (The San Francisco 49ers signed WR Tyron Johnson to a reserve/future contract.) From |
| | OL | Signed (The San Francisco 49ers signed C Keith Ismael to a reserve/future contract.) |
| | DL | Signed (The San Francisco 49ers signed DE Alex Barrett to a reserve/future contract.) |
| | OL | Signed (The San Francisco 49ers signed T Leroy Watson to a reserve/future contract.) |
| | S | Signed (The San Francisco 49ers signed DB Tayler Hawkins to a reserve/future contract.) |
| | LB | Signed (The San Francisco 49ers signed LB Curtis RObinson to a reserve/future contract.) |
| | OL | Signed (The San Francisco 49ers signed G Jason Poe to a reserve/future contract.) |
| | WR | Signed (The San Francisco 49ers signed WR Dazz Newsome to a reserve/future contract.) |
| | WR | Signed (The San Francisco 49ers signed WR Tay Martin to a reserve/future contract.) |
| | CB | Signed (The San Francisco 49ers signed DB Qwuantrezz Knight to a reserve/future contract.) |
| | OL | Signed (The San Francisco 49ers signed T Alfredo Gutierrez to a reserve/future contract.) |
| | RB | Pract. squad add (The San Francisco 49ers assigned RB Tevin Coleman to the practice squad.) |
| | CB | Pract. squad add (The San Francisco 49ers assigned DB Janoris Jenkins to the practice squad.) |
| | CB | Activated (The San Francisco 49ers elevated CB Janoris Jenkins to the active roster.) |
| | RB | Activated (The San Francisco 49ers elevated RB Tevin Coleman to the active roster.) |
| | CB | Pract. squad add (The San Francisco 49ers assigned DB Janoris Jenkins to the practice squad.) |
| | DL | Pract. squad add (The San Francisco 49ers assigned DL Alex Barrett to the practice squad.) |
| | DL | Activated (The San Francisco 49ers elevated DE Alex Barrett from the practice squad. ) |
| | CB | Activated (The San Francisco 49ers elevated CB Janoris Jenkins from the practice squad. ) |
| | RB | Activated (The San Francisco 49ers elevated RB Tevin Coleman to the active roster.) |
| | DT | Pract. squad add (The San Francisco 49ers assigned DL Michael Dwumfour to the practice squad.) |
| | RB | Activated (The San Francisco 49ers activated RB Elijah Mitchell from injured reserve. ) |
| | DL | Pract. squad add (The San Francisco 49ers signed DT Akeem Spence to the practice squad.) |
| | RB | Placed on Injured Reserve, Designated for Return (The San Francisco 49ers placed RB Elijah Mitchell on IRD.) |
| | QB | Waived (The San Francisco 49ers waived QB Jacob Eason from the practice squad.) |
| | DL | Waived (The San Francisco 49ers waived DT Akeem Spence.) |
| | DL | Pract. squad add (The San Francisco 49ers assigned DL Kemoko Turay to the practice squad.) |
| | WR | Pract. squad add (The San Francisco 49ers assigned WR Tay Martin to the practice squad.) |
| | DL | Activated (The San Francisco 49ers elevated DE Kemoko Turay to the active roster.) |
| | WR | Activated (The San Francisco 49ers elevated WR Tay Martin to the active roster.) |
| | LB | Pract. squad add (The San Francisco 49ers signed LB Curtis Robinson to the practice squad.) |
| | CB | Released (The San Francisco 49ers released CB Tre Swilling from the practice squad.) |
| | LB | Waived (The San Francisco 49ers waived LB Curtis Robinson.) |
| | WR | Activated (The San Francisco 49ers activated WR Willie Snead from practice squad.) |
| | DT | Activated (The San Francisco 49ers activated DT Javon Kinlaw from IRD.) |
| | DT | Activated (The San Francisco 49ers activated DL Michael Dwumfour from practice squad.) |
| | DL | Placed on Injured Reserve, Designated for Return (The San Francisco 49ers placed DL Kalia Davis on IRD.) |
| | CB | Signed (The San Francisco 49ers signed DB Tre Swilling to the practice squad.) |
| | DT | Placed on Injured Reserve, Designated for Return (The San Francisco 49ers designated DT Javon Kinlaw to return from injured reserve.) |
| | CB | Pract. squad add (The San Francisco 49ers assigned DB Janoris Jenkins to the practice squad.) |
| | DT | Placed on Injured Reserve (The San Francisco 49ers placed DL Hassan Ridgeway on IR.) |
| | DL | Activated (The San Francisco 49ers elevated DL Akeem Spence to the active roster.) |
| | WR | Activated (The San Francisco 49ers elevated WR Willie Snead IV to the active roster.) |
| | CB | Activated (The San Francisco 49ers elevated DB Janoris Jenkins to the active roster.) |
| | CB | Placed on Injured Reserve (The San Francisco 49ers placed DB Dontae Johnson on IR.) |
| | DT | Signed (The San Francisco 49ers signed DL Michael Dwumfour to the practice squad. ) |
| | CB | Pract. squad add (The San Francisco 49ers assigned DB Dontae Johnson to the practice squad.) |
| | RB | Pract. squad add (The San Francisco 49ers assigned RB Tevin Coleman to the practice squad.) |
| | CB | Activated (The San Francisco 49ers elevated DB Dontae Johnson from the practice squad. ) |
| | RB | Activated (The San Francisco 49ers elevated RB Tevin Coleman from the practice squad. ) |
| | QB | Signed (The San Francisco 49ers signed QB Josh Johnson.) From |
| | RB | Placed on Injured Reserve (The San Francisco 49ers placed RB Elijah Mitchell on IR.) |
| | CB | Pract. squad del (Signed) |
| | DL | Pract. squad add (Signed) |
| | CB | Pract. squad add (Signed) From |
| | DL | Cut (Signed) |
| | DT | Active/prac. squad (Signed) |
| | DT | Pract. squad add (Signed) |
| | DT | Active/prac. squad (Signed) |
| | QB | Pract. squad del (Signed) |
| | WR | Pract. squad del (Signed) |
| | WR | Pract. squad add (Signed) From |
| | QB | Pract. squad add (Signed) From |
| | DT | Pract. squad add (Signed) |
| | DT | Active/prac. squad (Signed) |
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