Rangers landed two key men in Jack Simpson and Scott Wright on pre-contracts before shifting both of those signings forward by six months.
Celtic meanwhile moved for Everton's Jonjoe Kenny in a deadline day swoop - replacing Jeremie Frimpong who moved to Bayer Leverkusen for an eight-figure fee.
Aberdeen shipped out one striker in Sam Cosgrove before replacing him with three loanees while Hibs could have trouble brewing as they refused to let Kevin Nisbet join him at Birmingham City - but did bring Jackson Irvine and Chris Cadden back to Scotland.
Elsewhere Eamonn Brophy left Kilmarnock to join St Mirren, Paul McMullan crossed the road in Dundee and Hamilton finally landed a forward who they'll hope can spark another Premiership great.
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