Your question is worded weird, but you can take the capital loss you just incurred ($150 and apply it against any other capital gains you had in 2009, 2008, 2007, or 2006.
You have to apply it against capital gains you've realized. So if on your 2006 taxes you reported (for example) $1000 capital gain. You can carry the 2009 $150 loss back against that gain. (so it becomes $850 capital gain in 2006).
If you havn't sold the shares, you havn't incurred a loss. The loss can also be carried forward against gains for up to 7 years.
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