If you can't find this link, go to IV board and find the one that ends in "Fundamentals play out".
A link on that article titled "Daily short interest".
IB is very good about posting the shares available to short.
You may not find ARNA listed (when there are no shares, it disappears). There were 3,000 this morning. The shorts MO was to run it up in the AM and then beat it down. They didn't want to stoke the flames today, and took a different path.
They shorted at beginning, and have no shares going into the weekend and next week - which finally should be the week?
Alas - it's time to move this baby up and with volume, it will be over 8.50, 9, and then probably $10 by April 1st.