Former Hammer Tony Gale said
2017/2018 Season Spent £41m Sold £21.8m Net spend £19.2m
IN: Arnautovic £25m Hernandez £16m
OUT: Norveit £4m, Randolph £5m, Fletcher £4m, Feghouli £3.8m Valencia £5m
2016/2017 Season Spent £63.72m Sold £36.90m Net spend £26.82m
IN: Ayew £21.69m, Lanzini £10.80m, Snodgrass £10.80m, Fonte £8.28m, Masuaku £6.39m
Fernandez £5.76m
OUT: Payet £26.37m, Tomkins £10.37m
2015/2016 Season Spent £46.33m Sold £16.66m Net Spend £29.67m
IN: Payet £13.5m, Ogbonna £9.9m, Antonio £8.55m, Obiang £5.4m, Byram £4.32m, Jelavic £3.69m, Hendrie £1.17m
OUT: Downing £7.11m, Maiga £3.6m, Jarvis £3.06m, Zarate £1.89m, Jelavic £1m
2014/2015 Season Spent £31.64m Sold £3.96m Net Spend £27.98m
IN: Valencia £13.5m, Kouyate £6.75m, Sakho £4.5m, Cresswell £4.28m, Henry £1.71m, Amalfitano £900k
OUT: Diame £3.96m
Total Net Spend over four years equals £103.67m