No such option. Will not add.
We do have an option of having separate financial companies, where each user can only see the financials of the companies allowed. The accounts can be seen by everyone (Except admin only accounts can only be seen by an admin.)
If you want to add a financial company contact sales.
If you have a Fundraisers Web Portal, and they only use the portal to view and update accounts you can lock them to only see certain accounts.