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The 1958 season’s official transaction log: 283 trades, signings and releases involving major-league clubs, listed newest first.
| Date | Type | Player | From | To | Details |
|---|---|---|---|---|---|
| Dec 30, 1958 | Released | Pee Wee Reese | Los Angeles Dodgers | — | Release |
| Dec 23, 1958 | Released | Ernie Johnson | Milwaukee Braves | — | Release |
| Dec 23, 1958 | Signed as free agent | Ernie Johnson | — | Baltimore Orioles | Free agent signing |
| Dec 23, 1958 | Trade | Rip Repulski | Philadelphia Phillies | Los Angeles Dodgers | Trade |
| Dec 23, 1958 | Trade | Jim Golden | Philadelphia Phillies | Los Angeles Dodgers | Trade |
| Dec 23, 1958 | Trade | Gene Snyder | Philadelphia Phillies | Los Angeles Dodgers | Trade |
| Dec 23, 1958 | Trade | Sparky Anderson | Los Angeles Dodgers | Philadelphia Phillies | Trade |
| Dec 15, 1958 | Trade | Jim Busby | Baltimore Orioles | Boston Red Sox | Trade |
| Dec 15, 1958 | Trade | Billy Klaus | Boston Red Sox | Baltimore Orioles | Trade |
| Dec 6, 1958 | Trade | Reno Bertoia | Detroit Tigers | Washington Senators | Trade |
| Dec 6, 1958 | Trade | Ron Samford | Detroit Tigers | Washington Senators | Trade |
| Dec 6, 1958 | Trade | Jim Delsing | Detroit Tigers | Washington Senators | Trade |
| Dec 6, 1958 | Trade | Eddie Yost | Washington Senators | Detroit Tigers | Trade |
| Dec 6, 1958 | Trade | Rocky Bridges | Washington Senators | Detroit Tigers | Trade |
| Dec 6, 1958 | Trade | Neil Chrisley | Washington Senators | Detroit Tigers | Trade |
| Dec 5, 1958 | Released | Joey Amalfitano | San Francisco Giants | — | Release |
| Dec 4, 1958 | Signed | Jim Bouton | — | New York Yankees | Amateur free agent signing |
| Dec 4, 1958 | Trade | Wally Moon | St. Louis Cardinals | Los Angeles Dodgers | Trade |
| Dec 4, 1958 | Trade | Phil Paine | St. Louis Cardinals | Los Angeles Dodgers | Trade |
| Dec 4, 1958 | Trade | Gino Cimoli | Los Angeles Dodgers | St. Louis Cardinals | Trade |
| Dec 3, 1958 | Trade | Ruben Amaro | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Dec 3, 1958 | Trade | Chuck Essegian | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Dec 3, 1958 | Trade | Jack Sanford | Philadelphia Phillies | San Francisco Giants | Trade |
| Dec 3, 1958 | Trade | Valmy Thomas | San Francisco Giants | Philadelphia Phillies | Trade |
| Dec 3, 1958 | Trade | Ruben Gomez | San Francisco Giants | Philadelphia Phillies | Trade |
| Dec 3, 1958 | Trade | Luis Arroyo | Pittsburgh Pirates | Cincinnati Reds | Trade |
| Dec 3, 1958 | Trade | Nino Escalera | Cincinnati Reds | Pittsburgh Pirates | Trade |
| Dec 2, 1958 | Signed | John Herrnstein | — | Philadelphia Phillies | Amateur free agent signing |
| Dec 2, 1958 | Trade | Unnamed | Baltimore Orioles | Cleveland Indians | $30000 |
| Dec 2, 1958 | Trade | Russ Heman | Baltimore Orioles | Cleveland Indians | Trade |
| Dec 2, 1958 | Trade | Bobby Avila | Cleveland Indians | Baltimore Orioles | Trade |
| Dec 2, 1958 | Trade | Herb Moford | Detroit Tigers | Boston Red Sox | Trade |
| Dec 2, 1958 | Trade | Lou Berberet | Boston Red Sox | Detroit Tigers | Trade |
| Dec 2, 1958 | Trade | Vic Wertz | Cleveland Indians | Boston Red Sox | Trade |
| Dec 2, 1958 | Trade | Gary Geiger | Cleveland Indians | Boston Red Sox | Trade |
| Dec 2, 1958 | Trade | Jim Piersall | Boston Red Sox | Cleveland Indians | Trade |
| Nov 29, 1958 | Signed | Carl Yastrzemski | — | Boston Red Sox | Amateur free agent signing |
| Nov 20, 1958 | Trade | Billy Martin | Detroit Tigers | Cleveland Indians | Trade |
| Nov 20, 1958 | Trade | Al Cicotte | Detroit Tigers | Cleveland Indians | Trade |
| Nov 20, 1958 | Trade | Don Mossi | Cleveland Indians | Detroit Tigers | Trade |
| Nov 20, 1958 | Trade | Ray Narleski | Cleveland Indians | Detroit Tigers | Trade |
| Nov 20, 1958 | Trade | Ossie Alvarez | Cleveland Indians | Detroit Tigers | Trade |
| Nov 19, 1958 | Released | Ray Katt | St. Louis Cardinals | — | Release |
| Oct 27, 1958 | Trade | Jay Porter | Cleveland Indians | Washington Senators | Trade |
| Oct 27, 1958 | Trade | Ossie Alvarez | Washington Senators | Cleveland Indians | Trade |
| Oct 17, 1958 | Released | Solly Hemus | St. Louis Cardinals | — | Release |
| Oct 17, 1958 | Released | Bill Wight | St. Louis Cardinals | — | Release |
| Oct 13, 1958 | Trade | Bobby Tiefenauer | Toronto | Cleveland Indians | Trade |
| Oct 13, 1958 | Trade | Larry Raines | Cleveland Indians | Toronto | Trade |
| Oct 13, 1958 | Trade | Dave Pope | Cleveland Indians | Toronto | Trade |
| Oct 7, 1958 | Trade | Marv Grissom | San Francisco Giants | St. Louis Cardinals | Trade |
| Oct 7, 1958 | Trade | Ernie Broglio | San Francisco Giants | St. Louis Cardinals | Trade |
| Oct 7, 1958 | Trade | Billy Muffett | St. Louis Cardinals | San Francisco Giants | Trade |
| Oct 7, 1958 | Trade | Hobie Landrith | St. Louis Cardinals | San Francisco Giants | Trade |
| Oct 7, 1958 | Trade | Benny Valenzuela | St. Louis Cardinals | San Francisco Giants | Trade |
| Oct 3, 1958 | Trade | Alex Grammas | Cincinnati Reds | St. Louis Cardinals | Trade |
| Oct 3, 1958 | Trade | George Crowe | Cincinnati Reds | St. Louis Cardinals | Trade |
| Oct 3, 1958 | Trade | Alex Kellner | Cincinnati Reds | St. Louis Cardinals | Trade |
| Oct 3, 1958 | Trade | Bob Mabe | St. Louis Cardinals | Cincinnati Reds | Trade |
| Oct 3, 1958 | Trade | Eddie Kasko | St. Louis Cardinals | Cincinnati Reds | Trade |
| Oct 3, 1958 | Trade | Del Ennis | St. Louis Cardinals | Cincinnati Reds | Trade |
| Oct 2, 1958 | Trade | Chico Carrasquel | Kansas City Athletics | Baltimore Orioles | Trade |
| Oct 2, 1958 | Trade | Dick Williams | Baltimore Orioles | Kansas City Athletics | Trade |
| Oct 1958 | Trade | Jim Finigan | San Francisco Giants | Baltimore Orioles | Trade |
| Oct 1958 | Trade | Art Ceccarelli | Baltimore Orioles | San Francisco Giants | Trade |
| Oct 1958 | Trade | Jim Brideweser | Baltimore Orioles | San Francisco Giants | Trade |
| Sep 29, 1958 | Trade | Solly Hemus | Philadelphia Phillies | St. Louis Cardinals | Trade |
| Sep 29, 1958 | Trade | Gene Freese | St. Louis Cardinals | Philadelphia Phillies | Trade |
| Sep 13, 1958 | Signed | Lee Elia | — | Philadelphia Phillies | Amateur free agent signing |
| Sep 12, 1958 | Signed as free agent | Jack Kralick | — | Washington Senators | Free agent signing |
| Sep 2, 1958 | Signed | Jerry Adair | — | Baltimore Orioles | Amateur free agent signing |
| Sep 1958 | Signed | Chuck Schilling | — | Boston Red Sox | Amateur free agent signing |
| Aug 25, 1958 | Signed | Jesus Alou | — | San Francisco Giants | Amateur free agent signing |
| Aug 22, 1958 | Trade | Unnamed | New York Yankees | Kansas City Athletics | $ |
| Aug 22, 1958 | Trade | Murry Dickson | Kansas City Athletics | New York Yankees | Trade |
| Aug 22, 1958 | Trade | Zeke Bella | New York Yankees | Kansas City Athletics | Trade |
| Aug 7, 1958 | Signed | Willie Stargell | — | Pittsburgh Pirates | Amateur free agent signing |
| Aug 1, 1958 | Released | Gus Niarhos | Philadelphia Phillies | — | Release |
| Jul 31, 1958 | Signed | Norm Gigon | — | Philadelphia Phillies | Amateur free agent signing |
| Jul 27, 1958 | Trade | Unnamed | Philadelphia Phillies | Detroit Tigers | $ |
| Jul 27, 1958 | Trade | Jim Hegan | Detroit Tigers | Philadelphia Phillies | Trade |
| Jul 27, 1958 | Trade | John Turk | Philadelphia Phillies | Detroit Tigers | Trade |
| Jul 26, 1958 | Released | Ted Tappe | Chicago Cubs | — | Release |
| Jul 23, 1958 | Signed as free agent | Gus Niarhos | — | Philadelphia Phillies | Free agent signing |
| Jul 21, 1958 | Signed | Dwight Siebler | — | Philadelphia Phillies | Amateur free agent signing |
| Jul 20, 1958 | Trade | Jack Spring | Boston Red Sox | Cleveland Indians | Trade (date approximate, per the source) |
| Jul 20, 1958 | Trade | Stu Locklin | Cleveland Indians | Boston Red Sox | Trade (date approximate, per the source) |
| Jul 19, 1958 | Signed | Phil Niekro | — | Milwaukee Braves | Amateur free agent signing |
| Jul 15, 1958 | Trade | Don Johnson | Toronto | San Francisco Giants | Trade |
| Jul 15, 1958 | Trade | Ray Crone | San Francisco Giants | Toronto | Trade |
| Jul 11, 1958 | Trade | Joe Albanese | Boston Red Sox | Washington Senators | Added to trade |
| Jul 9, 1958 | Signed | John Boozer | — | Philadelphia Phillies | Amateur free agent signing |
| Jul 2, 1958 | Released | Bob Lemon | Cleveland Indians | — | Release |
| Jul 1958 | Signed | Guido Grilli | — | Boston Red Sox | Amateur free agent signing |
| Jul 1958 | Trade | Jim Snyder | Philadelphia Phillies | Chicago White Sox | Trade |
| Jul 1958 | Trade | Unnamed | Chicago White Sox | Philadelphia Phillies | Trade |
| Jun 30, 1958 | Signed | Mickey Lolich | — | Detroit Tigers | Amateur free agent signing |
| Jun 27, 1958 | Released | Jerry Dahlke | Chicago White Sox | — | Release |
| Jun 24, 1958 | Signed | Ron Fairly | — | Los Angeles Dodgers | Amateur free agent signing |
| Jun 24, 1958 | Trade | Bud Byerly | Washington Senators | Boston Red Sox | Trade |
| Jun 24, 1958 | Trade | Jack Spring | Boston Red Sox | Washington Senators | Trade |
| Jun 23, 1958 | Released | Rube Walker | Los Angeles Dodgers | — | Release |
| Jun 23, 1958 | Trade | Art Fowler | Cincinnati Reds | Los Angeles Dodgers | Trade |
| Jun 23, 1958 | Trade | Charlie Rabe | Cincinnati Reds | Los Angeles Dodgers | Trade |
| Jun 23, 1958 | Trade | Vito Valentinetti | Detroit Tigers | Washington Senators | Trade |
| Jun 23, 1958 | Trade | Al Cicotte | Washington Senators | Detroit Tigers | Trade |
| Jun 20, 1958 | Signed | Willie Davis | — | Los Angeles Dodgers | Amateur free agent signing |
| Jun 18, 1958 | Signed | Larry Maxie | — | Milwaukee Braves | Amateur free agent signing |
| Jun 16, 1958 | Signed | Dick Ellsworth | — | Chicago Cubs | Amateur free agent signing |
| Jun 16, 1958 | Signed | Denny Lemaster | — | Milwaukee Braves | Amateur free agent signing |
| Jun 16, 1958 | Trade | Freddy Rodriguez | Chicago Cubs | Kansas City Athletics | Trade |
| Jun 16, 1958 | Trade | Dave Melton | Kansas City Athletics | Chicago Cubs | Trade |
| Jun 15, 1958 | Trade | Unnamed | St. Louis Cardinals | Pittsburgh Pirates | $ |
| Jun 15, 1958 | Trade | Gene Freese | Pittsburgh Pirates | St. Louis Cardinals | Trade |
| Jun 15, 1958 | Trade | Johnny O'Brien | Pittsburgh Pirates | St. Louis Cardinals | Trade |
| Jun 15, 1958 | Trade | Dick Schofield | St. Louis Cardinals | Pittsburgh Pirates | Trade |
| Jun 15, 1958 | Trade | Johnny Klippstein | Cincinnati Reds | Los Angeles Dodgers | Trade |
| Jun 15, 1958 | Trade | Steve Bilko | Cincinnati Reds | Los Angeles Dodgers | Trade |
| Jun 15, 1958 | Trade | Don Newcombe | Los Angeles Dodgers | Cincinnati Reds | Trade |
| Jun 15, 1958 | Trade | Ray Boone | Detroit Tigers | Chicago White Sox | Trade |
| Jun 15, 1958 | Trade | Bob Shaw | Detroit Tigers | Chicago White Sox | Trade |
| Jun 15, 1958 | Trade | Bill Fischer | Chicago White Sox | Detroit Tigers | Trade |
| Jun 15, 1958 | Trade | Tito Francona | Chicago White Sox | Detroit Tigers | Trade |
| Jun 15, 1958 | Trade | Duke Maas | Kansas City Athletics | New York Yankees | Trade |
| Jun 15, 1958 | Trade | Virgil Trucks | Kansas City Athletics | New York Yankees | Trade |
| Jun 15, 1958 | Trade | Bob Grim | New York Yankees | Kansas City Athletics | Trade |
| Jun 15, 1958 | Trade | Harry Simpson | New York Yankees | Kansas City Athletics | Trade |
| Jun 15, 1958 | Trade | Woodie Held | Kansas City Athletics | Cleveland Indians | Trade |
| Jun 15, 1958 | Trade | Vic Power | Kansas City Athletics | Cleveland Indians | Trade |
| Jun 15, 1958 | Trade | Roger Maris | Cleveland Indians | Kansas City Athletics | Trade |
| Jun 15, 1958 | Trade | Preston Ward | Cleveland Indians | Kansas City Athletics | Trade |
| Jun 15, 1958 | Trade | Dick Tomanek | Cleveland Indians | Kansas City Athletics | Trade |
| Jun 13, 1958 | Signed | Herm Starrette | — | Baltimore Orioles | Amateur free agent signing |
| Jun 13, 1958 | Trade | Joe Lonnett | Philadelphia Phillies | Milwaukee Braves | Trade |
| Jun 13, 1958 | Trade | Carl Sawatski | Milwaukee Braves | Philadelphia Phillies | Trade |
| Jun 12, 1958 | Trade | Billy Hunter | Kansas City Athletics | Cleveland Indians | Trade |
| Jun 12, 1958 | Trade | Chico Carrasquel | Cleveland Indians | Kansas City Athletics | Trade |
| Jun 9, 1958 | Signed | Ron Perranoski | — | Chicago Cubs | Amateur free agent signing |
| Jun 8, 1958 | Signed | Danny Cater | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 5, 1958 | Signed | Cal Emery | — | Philadelphia Phillies | Amateur free agent signing |
| Jun 3, 1958 | Signed | Gaylord Perry | — | San Francisco Giants | Amateur free agent signing |
| Jun 2, 1958 | Signed | Morrie Steevens | — | Chicago Cubs | Amateur free agent signing |
| Jun 1958 | Released | Jack Kralick | Chicago White Sox | — | Release |
| May 29, 1958 | Released | Mike Garcia | Cleveland Indians | — | Release |
| May 28, 1958 | Signed | Tommie Aaron | — | Milwaukee Braves | Amateur free agent signing |
| May 27, 1958 | Signed | Denis Menke | — | Milwaukee Braves | Amateur free agent signing |
| May 26, 1958 | Trade | Barney Schultz | St. Louis Cardinals | Detroit Tigers | Trade |
| May 26, 1958 | Trade | Ben Mateosky | Detroit Tigers | St. Louis Cardinals | Trade |
| May 23, 1958 | Signed | Tony Cloninger | — | Milwaukee Braves | Amateur free agent signing |
| May 21, 1958 | Signed as free agent | Roy Smalley | — | St. Louis Cardinals | Free agent signing |
| May 21, 1958 | Signed as free agent | Bill Wight | — | St. Louis Cardinals | Free agent signing |
| May 20, 1958 | Released | Roy Smalley | Philadelphia Phillies | — | Release |
| May 20, 1958 | Released | Bill Wight | Cincinnati Reds | — | Release |
| May 20, 1958 | Trade | Jim Brosnan | Chicago Cubs | St. Louis Cardinals | Trade |
| May 20, 1958 | Trade | Al Dark | St. Louis Cardinals | Chicago Cubs | Trade |
| May 17, 1958 | Signed as free agent | Eddie Miksis | — | Cincinnati Reds | Free agent signing |
| May 17, 1958 | Released | Nick Testa | San Francisco Giants | — | Release |
| May 16, 1958 | Released | Eddie Miksis | Baltimore Orioles | — | Release |
| May 8, 1958 | Trade | Hersh Freeman | Cincinnati Reds | Chicago Cubs | Trade |
| May 8, 1958 | Trade | Turk Lown | Chicago Cubs | Cincinnati Reds | Trade |
| May 7, 1958 | Signed | Dennis Bennett | — | Philadelphia Phillies | Amateur free agent signing |
| May 1, 1958 | Trade | Lou Berberet | Washington Senators | Boston Red Sox | Trade |
| May 1, 1958 | Trade | Ken Aspromonte | Boston Red Sox | Washington Senators | Trade |
| Apr 23, 1958 | Trade | Bob Kelly | Cincinnati Reds | Cleveland Indians | Trade |
| Apr 23, 1958 | Trade | Fred Hatfield | Cleveland Indians | Cincinnati Reds | Trade |
| Apr 21, 1958 | Released | Diego Segui | Cincinnati Reds | — | Release |
| Apr 17, 1958 | Trade | Bud Daley | Baltimore Orioles | Kansas City Athletics | Trade |
| Apr 17, 1958 | Trade | Arnie Portocarrero | Kansas City Athletics | Baltimore Orioles | Trade |
| Apr 16, 1958 | Signed | Vic Davalillo | — | Cincinnati Reds | Amateur free agent signing |
| Apr 14, 1958 | Released | Art Houtteman | Baltimore Orioles | — | Release |
| Apr 14, 1958 | Signed as free agent | Art Houtteman | — | Detroit Tigers | Free agent signing |
| Apr 3, 1958 | Signed | Steve Hamilton | — | Cleveland Indians | Amateur free agent signing |
| Apr 3, 1958 | Trade | Jim McManus | Detroit Tigers | Kansas City Athletics | Trade |
| Apr 3, 1958 | Trade | Unnamed | Chicago Cubs | San Francisco Giants | $ |
| Apr 3, 1958 | Trade | Bobby Thomson | San Francisco Giants | Chicago Cubs | Trade |
| Apr 3, 1958 | Trade | Bob Speake | Chicago Cubs | San Francisco Giants | Trade |
| Apr 2, 1958 | Trade | Ray Katt | San Francisco Giants | St. Louis Cardinals | Trade |
| Apr 2, 1958 | Trade | Jim King | St. Louis Cardinals | San Francisco Giants | Trade |
| Apr 1, 1958 | Trade | Gene Woodling | Cleveland Indians | Baltimore Orioles | Trade |
| Apr 1, 1958 | Trade | Dick Williams | Cleveland Indians | Baltimore Orioles | Trade |
| Apr 1, 1958 | Trade | Bud Daley | Cleveland Indians | Baltimore Orioles | Trade |
| Apr 1, 1958 | Trade | Larry Doby | Baltimore Orioles | Cleveland Indians | Trade |
| Apr 1, 1958 | Trade | Don Ferrarese | Baltimore Orioles | Cleveland Indians | Trade |
| Mar 27, 1958 | Trade | Unnamed | Detroit Tigers | Cleveland Indians | $20000 |
| Mar 27, 1958 | Trade | Pete Wojey | Detroit Tigers | Cleveland Indians | Trade |
| Mar 27, 1958 | Trade | Milt Bolling | Cleveland Indians | Detroit Tigers | Trade |
| Mar 27, 1958 | Trade | Vito Valentinetti | Cleveland Indians | Detroit Tigers | Trade |
| Mar 5, 1958 | Signed | Frank Howard | — | Los Angeles Dodgers | Amateur free agent signing |
| Feb 25, 1958 | Trade | Milt Bolling | Washington Senators | Cleveland Indians | Trade |
| Feb 25, 1958 | Trade | Pete Mesa | Cleveland Indians | Washington Senators | Trade |
| Feb 18, 1958 | Trade | Hal Woodeshick | Detroit Tigers | Cleveland Indians | Trade |
| Feb 18, 1958 | Trade | Jay Porter | Detroit Tigers | Cleveland Indians | Trade |
| Feb 18, 1958 | Trade | Jim Hegan | Cleveland Indians | Detroit Tigers | Trade |
| Feb 18, 1958 | Trade | Hank Aguirre | Cleveland Indians | Detroit Tigers | Trade |
| Jan 28, 1958 | Signed | Jacke Davis | — | Philadelphia Phillies | Amateur free agent signing |
| Jan 28, 1958 | Signed as free agent | Murry Dickson | — | Kansas City Athletics | Free agent signing |
| Jan 28, 1958 | Trade | Unnamed | Detroit Tigers | San Francisco Giants | $25000 |
| Jan 28, 1958 | Trade | Jim Finigan | Detroit Tigers | San Francisco Giants | Trade |
| Jan 28, 1958 | Trade | Ozzie Virgil | San Francisco Giants | Detroit Tigers | Trade |
| Jan 28, 1958 | Trade | Gail Harris | San Francisco Giants | Detroit Tigers | Trade |
| Jan 26, 1958 | Signed | Dave Nicholson | — | Baltimore Orioles | Amateur free agent signing |
| Jan 23, 1958 | Trade | Pete Runnels | Washington Senators | Boston Red Sox | Trade |
| Jan 23, 1958 | Trade | Albie Pearson | Boston Red Sox | Washington Senators | Trade |
| Jan 23, 1958 | Trade | Norm Zauchin | Boston Red Sox | Washington Senators | Trade |
| Jan 18, 1958 | Signed | Bob Tillman | — | Boston Red Sox | Amateur free agent signing |
| Jan 8, 1958 | Signed as free agent | Ted Tappe | — | Chicago Cubs | Free agent signing |
| before the 1958 season | Signed | Max Alvis | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed | Rich Barry | — | New York Yankees | Amateur free agent signing |
| before the 1958 season | Signed | Norm Bass | — | Kansas City Athletics | Amateur free agent signing |
| before the 1958 season | Signed | Jim Beauchamp | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1958 season | Signed as free agent | Tom Borland | — | Boston Red Sox | Free agent signing with first major-league team |
| before the 1958 season | Signed | Ron Brand | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1958 season | Signed | Larry Brown | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed | Bob Burda | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1958 season | Signed | Galen Cisco | — | Boston Red Sox | Amateur free agent signing |
| before the 1958 season | Signed | Horace Clarke | — | New York Yankees | Amateur free agent signing |
| before the 1958 season | Signed | Charlie Dees | — | San Francisco Giants | Amateur free agent signing |
| before the 1958 season | Signed | Miguel de la Hoz | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed | Jim Dickson | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1958 season | Signed | Doc Edwards | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed | Dick Egan | — | Detroit Tigers | Amateur free agent signing |
| before the 1958 season | Signed | Larry Elliot | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1958 season | Signed | Lorencito Fernandez | — | Detroit Tigers | Amateur free agent signing |
| before the 1958 season | Signed | Eddie Fisher | — | San Francisco Giants | Amateur free agent signing |
| before the 1958 season | Signed | Larry Foster | — | Detroit Tigers | Amateur free agent signing |
| before the 1958 season | Signed | Doug Gallagher | — | Detroit Tigers | Amateur free agent signing |
| before the 1958 season | Signed | Pedro Gonzalez | — | New York Yankees | Amateur free agent signing |
| before the 1958 season | Signed | Tom Haller | — | San Francisco Giants | Amateur free agent signing |
| before the 1958 season | Signed | Ron Herbel | — | San Francisco Giants | Amateur free agent signing |
| before the 1958 season | Signed | Rick Herrscher | — | Milwaukee Braves | Amateur free agent signing |
| before the 1958 season | Signed | Dennis Higgins | — | Chicago White Sox | Amateur free agent signing |
| before the 1958 season | Signed | Dick Howser | — | Kansas City Athletics | Amateur free agent signing |
| before the 1958 season | Signed | Dick Hughes | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1958 season | Signed | Bob Humphreys | — | Detroit Tigers | Amateur free agent signing |
| before the 1958 season | Signed | Ken Hunt | — | Cincinnati Reds | Amateur free agent signing |
| before the 1958 season | Signed | Charlie James | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1958 season | Signed | Mack Jones | — | Milwaukee Braves | Amateur free agent signing |
| before the 1958 season | Signed | Chris Krug | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1958 season | Signed | Jack Kubiszyn | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed | Jim Lawrence | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed | Jim Lehew | — | Baltimore Orioles | Amateur free agent signing |
| before the 1958 season | Signed | Dick LeMay | — | San Francisco Giants | Amateur free agent signing |
| before the 1958 season | Signed | Don Lock | — | New York Yankees | Amateur free agent signing |
| before the 1958 season | Signed | Ramon Lopez | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed | Al McBean | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1958 season | Signed | Orlando McFarlane | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1958 season | Signed | Jerry McNertney | — | Chicago White Sox | Amateur free agent signing |
| before the 1958 season | Released | Minnie Mendoza | Cincinnati Reds | — | Release |
| before the 1958 season | Signed as free agent | Minnie Mendoza | — | Washington Senators | Free agent signing |
| before the 1958 season | Signed | Pete Mikkelsen | — | New York Yankees | Amateur free agent signing |
| before the 1958 season | Signed | Bob Moorhead | — | Cincinnati Reds | Amateur free agent signing |
| before the 1958 season | Signed | Al Moran | — | Boston Red Sox | Amateur free agent signing |
| before the 1958 season | Signed | Buster Narum | — | Baltimore Orioles | Amateur free agent signing |
| before the 1958 season | Released | Chet Nichols | Milwaukee Braves | — | Release |
| before the 1958 season | Signed | Ron Nischwitz | — | Detroit Tigers | Amateur free agent signing |
| before the 1958 season | Signed | John Papa | — | Baltimore Orioles | Amateur free agent signing |
| before the 1958 season | Signed | Joe Pepitone | — | New York Yankees | Amateur free agent signing |
| before the 1958 season | Signed | John Pregenzer | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1958 season | Signed | Pete Richert | — | Los Angeles Dodgers | Amateur free agent signing |
| before the 1958 season | Signed | Earl Robinson | — | Los Angeles Dodgers | Amateur free agent signing |
| before the 1958 season | Signed | Vic Roznovsky | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1958 season | Signed | Chico Ruiz | — | Cincinnati Reds | Amateur free agent signing |
| before the 1958 season | Signed | Ray Sadecki | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1958 season | Signed | Bob Sadowski | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1958 season | Signed | Amado Samuel | — | Milwaukee Braves | Amateur free agent signing |
| before the 1958 season | Signed | Don Schwall | — | Boston Red Sox | Amateur free agent signing |
| before the 1958 season | Signed | Johnnie Seale | — | Washington Senators | Amateur free agent signing |
| before the 1958 season | Signed | Diego Segui | — | Cincinnati Reds | Amateur free agent signing |
| before the 1958 season | Signed | Mike Shannon | — | St. Louis Cardinals | Amateur free agent signing |
| before the 1958 season | Signed | Sonny Siebert | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed as free agent | George Smith | — | Detroit Tigers | Free agent signing with first major-league team |
| before the 1958 season | Signed | Jose Tartabull | — | San Francisco Giants | Amateur free agent signing |
| before the 1958 season | Signed | Tom Tresh | — | New York Yankees | Amateur free agent signing |
| before the 1958 season | Signed | Bob Veale | — | Pittsburgh Pirates | Amateur free agent signing |
| before the 1958 season | Signed | Freddie Velazquez | — | San Francisco Giants | Amateur free agent signing |
| before the 1958 season | Signed | Zoilo Versalles | — | Washington Senators | Amateur free agent signing |
| before the 1958 season | Signed | Jose Vidal | — | San Francisco Giants | Amateur free agent signing |
| before the 1958 season | Signed | Pete Ward | — | Baltimore Orioles | Amateur free agent signing |
| before the 1958 season | Signed | Jack Warner | — | Chicago Cubs | Amateur free agent signing |
| before the 1958 season | Signed | Jim Weaver | — | Cleveland Indians | Amateur free agent signing |
| before the 1958 season | Signed | Don Wert | — | Detroit Tigers | Amateur free agent signing |
| before the 1958 season | Signed as free agent | Fred Whitfield | — | St. Louis Cardinals | Free agent signing |
| before the 1958 season | Signed | Dooley Womack | — | New York Yankees | Amateur free agent signing |
Every row is mapped onto the same trade / signing / release vocabulary the modern feed uses, with the era’s own type description kept on each row. Club names are the names of the day (the Boston Braves years, the Brooklyn Dodgers years), and each links to the franchise it is today. Some dates are only partially known or flagged approximate by the source; they are shown exactly as published, never completed to a fake precise day.