Major League Soccer’s (MLS) summer transfer window was a mix of uncertainty, varied strategies, and record-breaking spending, driven by the anticipation of the 2026 World Cup and potential rule changes. This was the fourth transfer window since MLS transitioned to a system where clubs could buy players using traditional transfer fees, rather than relying solely on General Allocation Money (GAM), an internal currency used to sign players. This shift, along with higher GAM allocations per club, has led to a significant increase in spending. MLS teams spent 65% more this summer compared to the previous year, reaching nearly $190 million, which accounts for 45% of the total expected spending for 2026. Overall, MLS has spent over $410 million on transfers and trades in 2026, more than double the amount spent in 2023. The growth in spending has been especially notable between 2024 and 2025, with a new rule allowing clubs to convert up to $3 million in eligible transfer revenue into GAM each year. This has made it easier for teams to reach the revenue threshold, increasing the circulation of GAM. This system has helped teams reduce their salary cap burdens and facilitate trades. Since 2022, MLS has earned nearly $800 million from selling players, with younger players increasingly leaving the league. This summer, six players under the age of 23 left in deals worth $5 million or more, including three U.S.-born players. Notably, 19-year-old Australian Lucas Herrington moved from Colorado Rapids to Hull City for $17 million, while American Zavier Gozo, a product of Real Salt Lake’s academy, joined Crystal Palace for $15 million. Sporting Kansas City underwent a major rebuild following the departure of Peter Vermes, their former head coach and sporting director, and the hiring of David Lee as sporting director. New owner Peter Mallouk has shifted the club’s spending strategy, increasing player acquisition costs from $18 million to $56 million since 2022. This summer, they spent $27.2 million despite starting the year with only 14 senior players and no designated player (DP) or U22 Initiative player. They signed one DP, Andre Luiz, for $18 million, and filled their U22 spot by acquiring Owen Wolff from Austin for $4.5 million. However, despite this investment, Sporting KC is currently at the bottom of the league and has one of the worst defensive records in MLS history. As the league prepares for a new schedule that will shift from a spring-to-fall format to a fall-to-spring format starting in 2027, teams are adjusting their strategies. Some clubs, like Sporting KC, St. Louis City, and Colorado Rapids, have spent far above their usual budgets, while others, such as Los Angeles FC, have spent minimally. Charlotte FC, for example, spent nothing on transfer fees but signed Allan Saint-Maximin and earned $6 million from selling Kerwin Vargas. The varying approaches highlight the uncertainty and adaptability in the league, as teams navigate new rules and the buildup to the 2026 World Cup. Despite these differences, MLS spending continues to rise, with a year of change expected in the near future.