Honestly, when $ARX jumped 2.14% in the last 5 minutes, my first instinct was to check the trading volume (24h: $5.23 million).
Why check volume first? I've been burned before: a rally without volume is usually just a spike, and chasing it can leave you stuck holding the bag.
This gain looks fairly healthy, so it's worth keeping an eye on.
What do you usually look at first when you see a rally?

#ARX