Look at a simple 2 year chart and you will find your answer: SSRI is in a long term downward trend, combined with short term higher than average negative volume.
I took this as a buying opportunity. Over sold on offering convertible senior notes. IMO
I don't like the price action, but borrowing cheap money seems to be the right thing to do right now... even if you don't need it. I've seen a lot of companies issues tons of senior notes in the last week.