| Date | Transaction |
| 02-28-1975 | Mac Barnhart has retired from football. |
| 08-05-1974 | The Philadelphia Whiners have waived Mac Barnhart. |
| 09-18-1972 | The Charlotte Brontes have moved Mac Barnhart to the active roster. The Charlotte Brontes have moved John Margerum to the inactive roster. |
| 09-18-1972 | The Charlotte Brontes have acquired Mac Barnhart from the waiver wire. |
| 08-28-1972 | The Winnipeg Jets have waived Mac Barnhart. |
| 08-13-1972 | The Winnipeg Jets have placed Mac Barnhart on the trade block. |
| 01-17-1972 | The Winnipeg Jets have moved Alonzo Moore, Robert George, Lawrence Sanders, Joe Walton, Adam Fleming, Greg Nowatzke, Walter Ontko, and Don Frickey to the active roster. The Winnipeg Jets have moved Carl Fredricksen, Myles Schlichter, Monte Carlton, Mac Barnhart, Willy Wonka, Shawn Abdullah, and Harry Paratestes to the inactive roster. |
| 12-26-1971 | The Winnipeg Jets have moved Carl Fredricksen, Myles Schlichter, Jackie Hufford, Monte Carlton, Mac Barnhart, and Willy Wonka to the active roster. The Winnipeg Jets have moved Alonzo Moore, Robert George, Joe Walton, Adam Fleming, Greg Nowatzke, and Don Frickey to the inactive roster. |
| 12-05-1971 | The Winnipeg Jets have moved Riall Talbert, Alonzo Moore, Joe Walton, Adam Fleming, Walter Ontko, and Don Frickey to the active roster. The Winnipeg Jets have moved Myles Schlichter, Jackie Hufford, Robert George, Mac Barnhart, Zack Kirk, and Willy Wonka to the inactive roster. |
| 11-29-1971 | The Winnipeg Jets have moved Mac Barnhart to the active roster. The Winnipeg Jets have moved Alonzo Moore to the inactive roster. |
| 11-29-1971 | The Winnipeg Jets have moved Robert George and Alonzo Moore to the active roster. The Winnipeg Jets have moved Riall Talbert and Mac Barnhart to the inactive roster. |
| 09-12-1971 | Mac Barnhart of the Winnipeg Jets is injured with a quadricep contusion and is expected to be out for approximately 5 days. |
| 09-05-1971 | The Winnipeg Jets have moved Larry Albrecht, Carl Fredricksen, Rick Preston, Chuck Behan, Monte Carlton, Pete Maskas, Mac Barnhart, Willy Wonka, Shawn Abdullah, Dennis Nix, Tom Bollinger, Ashley West, Harry Paratestes, and Kevin Reynolds to the active roster. The Winnipeg Jets have moved Riall Talbert, Charles Luzar, Bud Coleman, Tom Chickillo, Zack Kirk, Herb Roque, Jerry Williams, Joe Walton, and Walter Ontko to the inactive roster. |
| 08-29-1971 | The Winnipeg Jets have moved Mac Barnhart to the inactive roster. |
| 08-29-1971 | Trade #26852 has been completed between the Winnipeg Jets and the Saskatchewan Yeti. The Saskatchewan Yeti receive Draft Pick - 1973 Round 4 (PIT) from the Winnipeg Jets in exchange for Mac Barnhart (CB). |
| 09-27-1970 | The Carolina Chargers have placed Mac Barnhart on the trade block. |
| 09-15-1968 | Mac Barnhart of the Carolina Chargers is injured with a shoulder muscle strain and is expected to be out for approximately 21 days. |
| 09-03-1967 | Trade #22081 has been completed between the Miami Dolphins and the Carolina Chargers. The Carolina Chargers receive Mac Barnhart (CB) from the Miami Dolphins in exchange for Draft Pick - 1968 Round 4 (CAR). |
| 08-21-1967 | The Miami Dolphins have moved Mac Barnhart to the active roster. |
| 08-14-1967 | The Miami Dolphins have placed Mac Barnhart on the trade block. |
| 08-07-1967 | The Miami Dolphins have moved Mac Barnhart to the inactive roster. |
| 12-05-1966 | The Miami Dolphins have moved Raymond Kelly and Mac Barnhart to the active roster. The Miami Dolphins have moved Eric Gift and Chris Johnson to the inactive roster. |
| 11-06-1966 | The Miami Dolphins have moved Chris Johnson and Raymond Kelly to the active roster. The Miami Dolphins have moved Mac Barnhart and Eric Gift to the inactive roster. |
| 11-06-1966 | Mac Barnhart of the Miami Dolphins is injured with a shoulder ligament sprain and is expected to be out for approximately 22 days. |
| 09-05-1966 | The Miami Dolphins have moved Eric Gift, John McCaffrey, and Mac Barnhart to the active roster. The Miami Dolphins have moved Stephen Joachim, Earl Burnett, and Bernie Crosby to the inactive roster. |
| 08-15-1966 | The Miami Dolphins have moved Earl Burnett, John Kozlowski, Bernie Crosby, and Chris Johnson to the active roster. The Miami Dolphins have moved Eric Gift, Stephen Joachim, Graham Metzger, and Mac Barnhart to the inactive roster. |
| 08-28-1961 | The Miami Dolphins have acquired Mac Barnhart from the waiver wire. |
| 08-20-1961 | The Green Bay Greys have waived Mac Barnhart. |
| 08-20-1961 | Mac Barnhart of the Green Bay Greys is injured with a neck nerve injury and is expected to be out for approximately 34 days. |
| 04-30-1961 | The Green Bay Greys have moved Fred Harrison, Joe O'Neal, Blake Miller, Mac Barnhart, and Ralph Francis to the active roster. The Green Bay Greys have moved Adam Lusk, Craig McGarity, Richie Rebowe, Phil Zellner, Robert McGee, and Gale Cappelletti to the inactive roster. |
| 02-06-1961 | The Green Bay Greys have moved Bob Lindell to the active roster. The Green Bay Greys have moved Mac Barnhart to the inactive roster. |
| 01-16-1961 | The Green Bay Greys have moved Mac Barnhart to the active roster. The Green Bay Greys have moved Bob Lindell to the inactive roster. |
| 09-12-1960 | The Green Bay Greys have moved Richard McDermott to the active roster. The Green Bay Greys have moved Mac Barnhart to the inactive roster. |
| 08-15-1960 | The Green Bay Greys have moved Mac Barnhart to the active roster. |
| 08-15-1960 | The Green Bay Greys have acquired Mac Barnhart from the waiver wire. |
| 08-08-1960 | The Buffalo Tigers have waived Mac Barnhart. |
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