I haven't read the details of the buyout, so everything I'm about to say may not apply.
Normally if someone "buys" a publicly traded company like WaMu, they are buying the stock by trading it for their own. The WaMu shares will be traded for JP Morgan Chase shares, though not dollar for dollar. The value of the trade will be divided among the outstanding shares of WaMu stock. That amount per share will be calculated for each WaMu shareholder. The shareholder will then receive a like dollar amount of JPMC shares in echange for their WaMu shares.
In other words...
1) JPMC says we will pay $1000 for WaMu, which has 1000 shares of outstanding stock. ($1 per share)
2) You have ten shares of WaMu stock. ($10 worth)
3) JPMC stock is worth $1.25 per share.
The $10 worth of WaMu will convert to $10 worth of JPMC at $1.25 per share.
$10 / $1.25 = 8.
You now have 8 shares of JPMC.
At least that's how it's
supposed to work.
Brad