What happened: Players on 40-man rosters can be traded between clubs until the cutoff. Afterward, they may still be placed and claimed on outright waivers.
Why it matters: The deadline separates trade acquisitions from waiver-only roster moves. Postseason eligibility generally requires players to be on a 40-man roster or 60-day injured list by noon ET on Sept. 1.
By the numbers: The permitted window spans seven calendar dates, July 28 through Aug. 3. All eight games on deadline day start at least 40 minutes after trading closes.
What to watch: Roster movement should accelerate as clubs settle on buying, selling or holding before trading closes.