No idea, but major trading on Friday:
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JDSU trades on unusually high volume
Trading volume reached 27.6mil; the average daily volume in the last 30 days was 3.8mil.
JDS Uniphase JDSU
Volume
Avg 30-day Volume
27.6mil
3.8mil
As of 12/20/2013 3:43:12 PM | USD
Volume Change
Close Price
627.97%
$12.36
Last Price
Day Change
$12.56
up
0.20 | 1.62%
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EDIT: I do see this explanation on another board, "$JDSU got kicked out of S&P500, volume was caused by funds rebalancing, not getting more attractive fundamentallly
Read more: www.nasdaq.com/symbol/jdsu/stream#ixzz2oJ3QYZGy
JDSU