The following is a list of all team-to-team transactions that have occurred in the National Hockey League during the 1972–73 NHL season. It lists what team each player has been traded to, signed by, or claimed by, and for which player(s) or draft pick(s), if applicable.
Trades
May
Trade completed on June 7, 1972.
June
The Islanders agrees to not select certain players in the 1972 NHL Expansion Draft. Atlanta agrees to not select certain players in the 1972 NHL Expansion Draft. Atlanta passed on making a selection. Trade completed on June 26, 1972. Minnesota passed on making a selection.
August
September
October
November
December
January
February
Trade completed on May 29, 1973.
March
Trade completed on June 4, 1973. Trade completed on May 16, 1973. Trade completed on May 22, 1973. Trade completed on May 17, 1973. Trade completed on May 18, 1973.
Expansion Draft
The 1972–73 NHL season saw the entrance of a 15th and 16th team to the league, the New York Islanders and Atlanta Flames. Each team selected 21 players from across the league, for a total of 42 selections.
Additional sources
hockeydb.com - search for player and select "show trades"