1 party owning >50% of a fund... problem?

[Kriegsspiel]

I was reading a Vangard bond fund PDF, and I noticed that it mentioned that some high percentage of the fund was owned by 1 party (so, I'm assuming a very rich person).  Has this ever been a problem, or is there a theoretical problem that this could entail for the future?  Like if said person decides they want to own a different fund, and pull all of their money out?  Maybe there is some contract they sign before putting in so much money that they can only take it out in chunks?

[Kriegsspiel]

Yea, sorry.

p. 50 of semiannual report for VGLT. 

"At February 29, 2012, one shareholder was the record or beneficial owner of 36% of the fund’s net
assets. If the shareholder were to redeem its total investment in the fund, the redemption might result
in an increase in the fund’s expense ratio, cause the fund to incur higher transaction costs, or result in
the realization of taxable capital gains."