Ann: Change in substantial holding , page-9

There are other possibilities. It could be a swap of some kind (say stock for interest payments) to get cheap increased exposure to the upside.

That is, JPM borrow stock from Matthews at a below-market rate and agree to a periodic interest payment. JPM could simply be betting that the stock price will increase enough (and quickly enough) to cover the interest payments and then some.

I've got no idea, but it's not necessarily short-selling behaviour IMVHO.

No point get worried about it - we're all in now, so may as well just see what happens. :)

Cheers,
Ben