| Date | Player | Position | Transaction |
|---|---|---|---|
| May 23 | Trevor Bell | RP | Signed to a Minor League Contract by Cincinnati |
| May 20 | Neftali Soto | 1B | Sent to Minors by Cincinnati |
| May 20 | Johnny Cueto | SP | Recalled From Minors Rehab by Cincinnati |
| May 18 | Tony Cingrani | RP | Sent to Minors by Cincinnati |
| May 18 | Neftali Soto | 1B | Called Up from Minors by Cincinnati |
| May 14 | Luis Durango | CF | Signed to a Minor League Contract by Cincinnati |
| May 14 | Chris Heisey | LF/CF | Recalled From Minors Rehab by Cincinnati |
| May 13 | Manny Parra | RP | Sent to Minors for Rehabilitation by Cincinnati |
| May 13 | Chris Heisey | LF/CF | Sent to Minors for Rehabilitation by Cincinnati |
| May 12 | Corky Miller | C | Outrighted to Minors by Cincinnati |
| May 10 | Corky Miller | C | Designated for Assignment by Cincinnati |
| May 10 | Ryan Hanigan | C | Recalled From Minors Rehab by Cincinnati |
| May 9 | Johnny Cueto | SP | Sent to Minors for Rehabilitation by Cincinnati |
| May 7 | Ryan Hanigan | C | Sent to Minors for Rehabilitation by Cincinnati |
| May 4 | Joe Mather | 3B/CF/LF/RF/1B | Signed to a Minor League Contract by Cincinnati |