Taiwan panel maker AUO jumped past the NT$30 mark for the first time in a while — good news for shareholders who have been stuck underwater, but the heavy volume is making some traders nervous.

• AUO touched NT$30.7 during the session before closing lower, up 3% on the day.
• Trading volume swelled sharply, a sign both buyers and sellers are moving in size.
• Long-suffering holders are cheering, with many finally close to breaking even.
• Skeptics think the rally is tied to a one-off factory sale and could fade fast.
• Rival panel maker Innolux slipped into the red, which bulls see as a warning sign.

Outlook: The near-term test is whether AUO can hold NT$30 and push toward its prior high, or whether profit-taking after the volume spike drags it back down.