| Transactions | ||||||
| Date | Team | Player | Type | OthTm | EffDate | When |
| 4/5/1920 | Bla | Holke | Acquired via trade | Geo | After | |
| 4/5/1920 | Bla | Johnston,J | Acquired via trade | Geo | After | |
| 4/5/1920 | Bla | Pratt | Traded away | Geo | After | |
| 4/5/1920 | Bla | Smith,Ea | Acquired via trade | Geo | After | |
| 5/30/1920 | Gal | Barnes,V | Demoted to reserve roster | Before | ||
| 5/30/1920 | Gal | Gaw | Promoted to active roster | Before | ||
| 6/5/1920 | Gal | Boland | Promoted to active roster | Before | ||
| 6/5/1920 | Gal | Glazner | Demoted to reserve roster | Before | ||
| 6/17/1920 | Tex | Ellison,G | Promoted to active roster | Before | ||
| 6/17/1920 | Tex | Townsend,L | Demoted to reserve roster | Before | ||
| 7/1/1920 | Bla | Collins,R | Traded away | DBL | After | |
| 7/1/1920 | Bla | Ruth | Traded away | DBL | After | |
| 7/1/1920 | Cha | Roush | Traded away | DBL | After | |
| 7/1/1920 | Gal | Jacobson | Traded away | DBL | After | |
| 7/1/1920 | Gal | Pipp | Traded away | DBL | After | |
| 7/1/1920 | KS | Evans | Traded away | DBL | After | |
| 7/1/1920 | KS | Konetchy | Traded away | DBL | After | |
| 7/1/1920 | KS | Konetchy | Acquired via trade | DBL | After | |
| 7/1/1920 | KS | Witt | Traded away | DBL | After | |
| 7/1/1920 | Mac | Dugan | Traded away | DBL | After | |
| 7/1/1920 | Mac | Grimes,B | Traded away | DBL | After | |
| 7/1/1920 | Mac | Sisler | Traded away | DBL | After | |
| 7/1/1920 | Mid | Burns,GJ | Traded away | DBL | After | |
| 7/1/1920 | Mid | Schalk | Traded away | DBL | After | |
| 7/1/1920 | NO | Alexander | Traded away | DBL | After | |
| 7/1/1920 | NO | Gardner | Traded away | DBL | After | |
| 7/1/1920 | NO | Hollocher | Traded away | DBL | After | |
| 7/1/1920 | Tex | Bancroft | Traded away | DBL | After | |
| 7/1/1920 | Tex | Coveleski | Traded away | DBL | After | |
| 7/1/1920 | Tex | Daubert | Traded away | DBL | After | |
| 7/1/1920 | Tex | Doyle | Traded away | DBL | After | |
| 7/1/1920 | Tex | Schang | Traded away | DBL | After | |
| 7/4/1920 | Bla | Collins,R | Acquired via trade | DBL | After | |
| 7/4/1920 | Bla | Ruth | Acquired via trade | DBL | After | |
| 7/4/1920 | Cha | Roush | Acquired via trade | DBL | After | |
| 7/4/1920 | Gal | Jacobson | Acquired via trade | DBL | After | |
| 7/4/1920 | Gal | Pipp | Acquired via trade | DBL | After | |
| 7/4/1920 | KS | Evans | Acquired via trade | DBL | After | |
| 7/4/1920 | KS | Witt | Acquired via trade | DBL | After | |
| 7/4/1920 | Mac | Dugan | Acquired via trade | DBL | After | |
| 7/4/1920 | Mac | Grimes,B | Acquired via trade | DBL | After | |
| 7/4/1920 | Mac | Sisler | Acquired via trade | DBL | After | |
| 7/4/1920 | Mid | Burns,GJ | Acquired via trade | DBL | After | |
| 7/4/1920 | Mid | Schalk | Acquired via trade | DBL | After | |
| 7/4/1920 | NO | Alexander | Acquired via trade | DBL | After | |
| 7/4/1920 | NO | Gardner | Acquired via trade | DBL | After | |
| 7/4/1920 | NO | Hollocher | Acquired via trade | DBL | After | |
| 7/4/1920 | Tex | Bancroft | Acquired via trade | DBL | After | |
| 7/4/1920 | Tex | Coveleski | Acquired via trade | DBL | After | |
| 7/4/1920 | Tex | Daubert | Acquired via trade | DBL | After | |
| 7/4/1920 | Tex | Doyle | Acquired via trade | DBL | After | |
| 7/4/1920 | Tex | Schang | Acquired via trade | DBL | After | |
| 8/6/1920 | Tex | Keenan | Demoted to reserve roster | Before | ||
| 8/6/1920 | Tex | Townsend,L | Promoted to active roster | Before | ||
| 8/17/1920 | Tex | Jackson | Acquired via trade | Top | After | |
| 8/18/1920 | Tex | Ellison,G | Demoted to reserve roster | Before | ||
| 8/18/1920 | Tex | Keenan | Released | Before | ||