When Stan Kroenke increased his stake in 2009, shares were valued at £8,500 apiece. Last year Arsenal shares had a mid-price value of £15,670.
(from Ronay's article on the decline of Wenger)
That's 85% over 8 years. Not bad, a steady return of about 8% pa. But also, being realistic, not exceptional.
We hear a fair bit about Arsenal being "bled" by an investment-minded owner, but there are definitely things other than football that Kroenke could've made more money on.
I've always felt the long term strategy might be to hold the club fortunes steady waiting on a disruptive event that increased its value (eg a super league or a new and lucrative platform for media rights).
I wonder if things get worse on the pitch might Stan decide to cash in?