Bitten is frequently used with the Accusative situation if you wish to express from whom you request some thing and used While using the preposition “um” accompanied by an Accusative object if you'd like to Convey what you're requesting. Don't forget: In German, 'bieten' means to supply or provide anything. https://magazin-welt.de/aktionarsrechte-und-gesellschaftsrecht-was-jeder-investor-wissen-sollte/