Transactions
| Date | Player | Pos | Transactions |
| 9/28 | JaMycal Hasty | RB | pract. squad add |
| 9/28 | Joe Walker | LB | pract. squad add |
| 9/26 | Hroniss Grasu | C | active/prac. squad |
| 9/26 | JaMycal Hasty | RB | active/prac. squad |
| 9/26 | Joe Walker | LB | active/prac. squad |
| 9/26 | Tevin Coleman | RB | on IR knee |
| 9/23 | Ezekiel Ansah | DE | signed/unrest FA One-year contract (through 2020) |
| 9/23 | Dion Jordan | DE | active/prac. squad |
| 9/23 | Alex Barrett | DE | pract. squad add |
| 9/23 | Austin Walter | RB | pract. squad add |
| 9/23 | Nick Bosa | DE | on IR torn left ACL |
| 9/23 | Solomon Thomas | DE | on IR torn left ACL |
| 9/22 | Christian Angulo | CB | pract. squad del |
| 9/21 | Hroniss Grasu | C | pract. squad add |
| 9/19 | Hroniss Grasu | C | active/prac. squad |
| 9/18 | Mohamed Sanu | WR | signed One-year contract (through 2020) |
| 9/18 | Richie James Jr. | WR | on IR hamstring |
| 9/16 | Ken Webster | CB | active/prac. squad |
| 9/16 | Dontae Johnson | CB | active/prac. squad |
| 9/16 | Brian Allen | CB | pract. squad add |
| 9/16 | Christian Angulo | CB | pract. squad add |
| 9/16 | Tim Harris Jr. | CB | pract. squad del |
| 9/16 | Richard Sherman | CB | on IR calf |
| 9/14 | Ross Reynolds | G | cut |
| 9/14 | Hroniss Grasu | C | pract. squad add |
| 9/14 | Dontae Johnson | CB | pract. squad add |
| 9/14 | Ross Reynolds | G | off IR undisclosed |
| 9/12 | Hroniss Grasu | C | active/prac. squad |
| 9/12 | Dontae Johnson | CB | active/prac. squad |
| 9/12 | Deebo Samuel | WR | on IR foot |
| 9/9 | Fred Warner | LB | reinstated |
| 9/6 | River Cracraft | WR | pract. squad add |
| 9/6 | Johnathan Cyprien | S | pract. squad add |
| 9/6 | Darrion Daniels | DT | pract. squad add |
| 9/6 | Hroniss Grasu | C | pract. squad add |
| 9/6 | Chase Harrell | TE | pract. squad add |
| 9/6 | Tim Harris Jr. | CB | pract. squad add |
| 9/6 | JaMycal Hasty | RB | pract. squad add |
| 9/6 | Josh Hokit | RB | pract. squad add |
| 9/6 | Jauan Jennings | WR | pract. squad add |
| 9/6 | Dontae Johnson | CB | pract. squad add |
| 9/6 | Dion Jordan | DE | pract. squad add |
| 9/6 | Jared Mayden | S | pract. squad add |
| 9/6 | Dakoda Shepley | G | pract. squad add |
| 9/6 | William Sweet | T | pract. squad add |
| 9/6 | Joe Walker | LB | pract. squad add |
| 9/6 | Kevin White | WR | pract. squad add |
| 9/6 | J.J. Nelson | WR | cut |
| 9/6 | J.J. Nelson | WR | off IR knee |
| 9/6 | Ross Reynolds | G | on IR undisclosed |
| 9/5 | Dakoda Shepley | G | cut |
| 9/5 | Jauan Jennings | WR | cut |
| 9/5 | Josh Hokit | RB | cut |
| 9/5 | Weston Richburg | C | cut |
| 9/5 | Ronald Blair III | DT | Placed on PUPL right knee |
| 9/5 | Alex Barrett | DE | cut |
| 9/5 | Jullian Taylor | DT | Placed on PUPL |
| 9/5 | River Cracraft | WR | cut |
| 9/5 | Johnathan Cyprien | S | cut |
| 9/5 | Darrion Daniels | DT | cut |
| 9/5 | Evan Foster | S | cut |
| 9/5 | Hroniss Grasu | C | cut |
| 9/5 | MarQueis Gray | TE | cut |
| 9/5 | Chase Harrell | TE | cut |
| 9/5 | Tim Harris Jr. | CB | cut |
| 9/5 | JaMycal Hasty | RB | cut |
| 9/5 | Dontae Johnson | CB | cut |
| 9/5 | Jaryd Jones-Smith | T | cut |
| 9/5 | Dion Jordan | DE | cut |
| 9/5 | Cameron Malveaux | DE | cut |
| 9/5 | Jared Mayden | S | cut |
| 9/5 | Shawn Poindexter | WR | cut |
| 9/5 | William Sweet | T | cut |
| 9/5 | Joe Walker | LB | cut |
| 9/5 | Kevin White | WR | cut |
| 9/4 | Jonathan Kongbo | DE | cut |
| 9/4 | Jonathan Kongbo | DE | off IR undisclosed |
| 9/3 | Jamar Taylor | CB | cut |
| 9/3 | Tavon Austin | WR | on IR knee |
| 9/2 | Cameron Malveaux | DE | signed |
| 9/1 | James Lockhart | LB | reserve/DNR |
| 8/31 | Fred Warner | LB | reserve/non football injury COVID-19 |
| 8/30 | Alex Barrett | DE | signed One-year contract (through 2020) |
| 8/30 | J.J. Nelson | WR | on IR knee |
| 8/29 | MarQueis Gray | TE | signed/unrest FA One-year contract (through 2020) |
| 8/29 | Dakoda Shepley | G | signed One-year contract (through 2020) |
| 8/29 | Kofi Amichia | G | cut |
| 8/29 | Erik Swoope | TE | cut |
| 8/29 | James Lockhart | LB | acquired from waiver |
| 8/28 | Jonathan Kongbo | DE | on IR undisclosed |
| 8/27 | River Cracraft | WR | signed |
| 8/27 | Kevin White | WR | signed |
| 8/27 | Jaron Brown | WR | cut |
| 8/25 | Erik Swoope | TE | signed One-year contract (through 2020) |
| 8/25 | Salvon Ahmed | RB | cut |
| 8/20 | Jaron Brown | WR | signed/unrest FA One-year contract (through 2020) |
| 8/20 | Johnathan Cyprien | S | signed/unrest FA One-year contract (through 2020) |
| 8/20 | Hroniss Grasu | C | signed/unrest FA One-year contract (through 2020) |
| 8/20 | Evan Foster | S | signed |
| 8/20 | DeMarkus Acy | CB | cut |
| 8/20 | Jonas Griffith | LB | cut |
| 8/20 | Jalen Hurd | WR | on IR torn ACL |
| 8/16 | Spencer Long | C | retired |
| 8/16 | Chris Thompson | WR | on IR undisclosed |
| 8/15 | Tavon Austin | WR | signed/unrest FA One-year contract (through 2020) |
| 8/15 | J.J. Nelson | WR | signed One-year contract (through 2020) |
| 8/15 | Daniel Helm | TE | cut |
| 8/13 | Alex Barrett | DE | cut |
| 8/13 | George Kittle | TE | re-signed Five-year extension (through 2025) |
| 8/12 | William Sweet | T | signed One-year contract (through 2020) |
| 8/9 | Jordan Reed | TE | signed One-year contract (through 2020) |
| 8/9 | Spencer Long | C | signed |
| 8/7 | Dion Jordan | DE | signed/unrest FA One-year contract (through 2020) |
| 8/6 | Shon Coleman | T | reserve/DNR COVID-19 Opt-Out |
| 8/6 | Jake Brendel | C | reserve/DNR COVID-19 Opt-Out |
| 8/5 | Travis Benjamin | WR | reserve/DNR COVID-19 Opt-Out |
| 8/4 | D.J. Reed Jr. | CB | cut |
| 8/4 | Chris Edwards | S | cut |
| 8/4 | Jeff Wilson Jr. | RB | reinstated |
| 8/3 | Richie James Jr. | WR | reinstated |
| 8/2 | Alex Barrett | DE | signed |
| 7/30 | Alex Barrett | DE | cut |
| 7/30 | Leonard Wester | T | cut |
| 7/30 | Jeff Wilson Jr. | RB | reserve/non football injury COVID-19 |
| 7/28 | Emmanuel Moseley | CB | re-signed/excl. FA One-year contract (through 2020) |
| 7/28 | Joey Alfieri | LB | cut |
| 7/28 | Jermaine Kelly | CB | cut |
| 7/28 | Derrick Kindred | S | cut |
| 7/28 | Ray Smith | DT | cut |
| 7/28 | Broc Rutter | QB | cut |
| 7/28 | Chris Finke | WR | cut |
| 7/28 | Willie Henry Jr. | DT | cut |
| 7/27 | Richie James Jr. | WR | reserve/non football injury COVID-19 |
| 7/27 | Charlie Woerner | TE | signed/draft choice Four-year contract (through 2023) |
| 7/6 | Jamar Taylor | CB | signed/unrest FA One-year contract (through 2020) |
| 7/6 | Teez Tabor | CB | cut |
| 6/26 | Javon Kinlaw | DT | signed/draft choice Four-year contract (fifth-year option) |
| 6/26 | Brandon Aiyuk | WR | signed/draft choice Four-year contract (fifth-year option) |
| 6/24 | Jauan Jennings | WR | signed/draft choice Four-year contract (through 2023) |
| 6/19 | Colton McKivitz | T | signed/draft choice Four-year contract (through 2023) |
| 5/1 | Nick Mullens | QB | re-signed/excl. FA One-year contract (through 2020) |
| 5/1 | Solomon Thomas | DE | team declines option Fifth-year option on rookie contract |
| 5/1 | Salvon Ahmed | RB | signed |
| 4/28 | DeMarkus Acy | CB | signed |
| 4/28 | Darrion Daniels | DT | signed |
| 4/28 | Chris Finke | WR | signed |
| 4/28 | Jonas Griffith | LB | signed |
| 4/28 | Chase Harrell | TE | signed |
| 4/28 | JaMycal Hasty | RB | signed |
| 4/28 | Broc Rutter | QB | signed |
| 4/28 | Jared Mayden | S | signed |
| 4/28 | Josh Hokit | RB | signed |
| 4/27 | Jacob Thieneman | S | cut |
| 4/25 | Trent Williams | T | traded for 2020 and 2021 draft picks |
| 4/25 | Joe Staley | T | retired |
| 4/20 | Jeff Wilson Jr. | RB | re-signed/excl. FA One-year contract (through 2020) |
| 4/16 | Matt Breida | RB | re-signed/rest FA One-year contract (through 2020) |
| 4/13 | Dontae Johnson | CB | re-signed/unrest FA One-year contract (through 2020) |
| 4/13 | Jason Verrett | CB | re-signed/unrest FA One-year contract (through 2020) |
| 4/6 | Kendrick Bourne | WR | re-signed/rest FA One-year contract (through 2020) |
| 3/24 | Ross Dwelley | TE | re-signed/excl. FA One-year contract (through 2020) |
| 3/24 | Kerry Hyder | DE | signed/unrest FA One-year contract (through 2020) |
| 3/24 | Travis Benjamin | WR | signed/unrest FA One-year contract (through 2020) |
| 3/23 | Joe Walker | LB | signed/unrest FA One-year contract (through 2020) |
| 3/20 | Daniel Brunskill | T | re-signed/excl. FA One-year contract (through 2020) |
| 3/19 | Tom Compton | G | signed/unrest FA One-year contract (through 2020) |
| 3/19 | Mike Person | C | cut |
| 3/18 | Kendrick Bourne | WR | Restricted Free Agent |
| 3/18 | Matt Breida | RB | Restricted Free Agent |
| 3/18 | Garrett Celek | TE | Declared Free Agent |
| 3/18 | Sheldon Day | DT | Declared Free Agent |
| 3/18 | Dontae Johnson | CB | Declared Free Agent |
| 3/18 | Jordan Matthews | WR | Declared Free Agent |
| 3/18 | Earl Mitchell | DT | Declared Free Agent |
| 3/18 | Damontre Moore | DE | Declared Free Agent |
| 3/18 | Emmanuel Sanders | WR | Declared Free Agent |
| 3/18 | Levine Toilolo | TE | Declared Free Agent |
| 3/18 | Jason Verrett | CB | Declared Free Agent |
| 3/18 | Jimmie Ward | S | Declared Free Agent |
| 3/18 | Anthony Zettel | DE | Declared Free Agent |
| 3/18 | Andrew Lauderdale | T | Declared Free Agent |
| 3/18 | Elijah Lee | LB | Declared Free Agent |
| 3/18 | Ben Garland | G | Declared Free Agent |
| 3/18 | Ben Garland | G | re-signed/unrest FA One-year contract (through 2020) |
| 3/18 | Jimmie Ward | S | re-signed/unrest FA Three-year contract (through 2022) |
| 3/18 | Ronald Blair III | DT | Declared Free Agent |
| 3/18 | Ronald Blair III | DT | re-signed/unrest FA One-year contract (through 2020) |
| 3/16 | Arik Armstead | DT | re-signed Five-year extension (through 2024) |
| 3/16 | Shon Coleman | T | re-signed One-year extension (through 2020) |
Last updated Sep. 29, 3:07 P.M. ET
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