X0101 EFFECT 33 LIVE 2019-08-16 09:00:00

N-14

0000893818 BlackRock Funds III 333-231805 0000893818 BlackRock Funds III S000004280 BlackRock LifePath Dynamic Retirement Fund C000012001 Investor A Shares 0000893818 BlackRock Funds III S000004277 BlackRock LifePath Dynamic 2020 Fund C000011995 Investor A Shares 0000893818 BlackRock Funds III S000004280 BlackRock LifePath Dynamic Retirement Fund C000012002 Institutional Shares 0000893818 BlackRock Funds III S000004277 BlackRock LifePath Dynamic 2020 Fund C000011996 Institutional Shares 0000893818 BlackRock Funds III S000004280 BlackRock LifePath Dynamic Retirement Fund C000051483 Class K 0000893818 BlackRock Funds III S000004277 BlackRock LifePath Dynamic 2020 Fund C000051480 Class K 0000893818 BlackRock Funds III S000004280 BlackRock LifePath Dynamic Retirement Fund C000082489 Class R Shares 0000893818 BlackRock Funds III S000004277 BlackRock LifePath Dynamic 2020 Fund C000082486 Class R Shares 0000893818 BlackRock Funds III S000004280 BlackRock LifePath Dynamic Retirement Fund C000088841 Investor C Shares 0000893818 BlackRock Funds III S000004277 BlackRock LifePath Dynamic 2020 Fund C000088832 Investor C Shares