buying shares does not give you influence unless you buy a lot of shares (51% ideally). Only a small portion of United is traded. This was simply a cash raising exercise by the Glazers a few years back. We are mostly still privately owned.
I dont see 25 percent of Uniteds shares being a "small portion". Its the opposite. A lot. The Glazers have silently relinquished more and more equity and even if I dont have the exact number they now only control around 75 percent of the equity of United. Its incorrect that this was a one time "small" exercise done years ago. Its been done over time.
Of course they still control the club via the unlisted Class Bs and their voting rights, but diluting their equity that much has more major consequences for them and the club that just voting rights.
Its far from a small thing.
The dividend policy to begin with.
Since all shares are treated equally the Glazers are giving away 25 percent of the dividends to other shareholders when the club does distribute dividends. Which the club will stop doing (distributing dividends) in January 2020 if I read the latest AR correctly. Something that for some reason seems to gone under the radar and also explains a bit of the dump the share price has taken.
It also has major impact for if the Glazers decide to sell and need to unlist Uniteds stock from the NYSE. How that would work today with so much equity alrady floated on the NYSE some US based stock lawyer needs to answer, its beyond my competence.
But to say or imply that the amount of shares that has been floated by the Glazers now is not of major consequence is incorrect.