While the Whites did match their big-money spending of last summer, they still had a strong window, bringing in the likes of Daniel James, Junior Firpo and Jack Harrison all for eight-figure fees.
One real area of interest in modern football is how well clubs manage to secure an eventual profit from players they buy, with the wildly inflated market meaning a player could be bought for a bargain fee one season and flogged for big money the next.
At the opposite end of the spectrum, some players command multi-million pound fees, before winding down their contracts and leaving for nothing a few years later.
Now the window has closed, we've taken a look (via BettingOdds.com data) at how much profit on previously purchased players every Premier League club has made over the last five years. Sales of academy players are also factored into the figures.
This is how Leeds United' s profit percentage on players sold ranks alongside all of their divisional rivals over the past half-decade of transfer activity.