The Bessemer Trust are named as joint guardians of her estate, along with her father Jamie Spears.
The star previously asked through a lawyer to end her father’s involvement but last week gave explosive testimony against the entire arrangement.
She described the conservatorship as “abusive” and asked for her life back.
Bessemer Trust filed a motion to withdraw from the arrangement on Thursday, just one day after the latest order in the long-running legal saga upheld their role as co-conservators.
The financial firm cited the singer’s 23 June court testimony as the reason it wants to quit.
Britney Spears FULL Conservatorship Hearing (Leaked HQ Audio) Opening Testimony
Britney Spears’ full opening testimony during her conservatorship hearing. She speaks directly to Judge Brenda Penny and asks her to end the conservatorship.
Fans React to Britney Spears Speaking Out Against Conservatorship
Elizabeth Wagmeister reports from the LA courthouse where Britney Spears speaks out publicly for the first time regarding ‘abusive’ conservatorship.