While there are still some interesting names out there, we’ve reached the point of the offseason where player movement slows to a crawl. Some things can still change, but a majority of teams are what they are at this point — for better or worse. That makes it a good time to check in on which teams improved (or declined) the most this summer.As usual, external changes are the only thing that matters here: Who’s in and who’s out, with some ice-time adjustments to make sure every newcomer fits in. Still, there are plenty of internal reasons beyond that as to why a team gets better year over year. That’s not the focus here; it’s about which teams look better on paper now compared to the start of the offseason. That’s based on the change in their Net Rating from their current roster to the one they ended the 2025-26 season with (including players acquired at the deadline).This is not an exact science, nor is it a list of how good each team is expected to be next season — just how much they’ve changed. A great team with a poor offseason can still be a great team next season. But it is worth noting some of last year’s most and least improved teams did end up trending in that exact direction.From most value added to least, here’s how each team has changed this offseason.NHL offer sheets are just businessSean Gentille and Sean McIndoe1. Nashville PredatorsNet Rating added: +27