Watch ATHR. Know when insiders buy.
One email the day a filing lands. Free.
A free account adds a watchlist, alerts when insiders, Congress or short sellers move on your tickers, and a morning brief. Sign up
| Report date | Shares short | Change | % of shares out | Avg daily volume | Days to cover |
|---|---|---|---|---|---|
| 2026-08-14 | 24K | −3K | 0.20% | 6K | 4.3 |
| 2026-07-31 | 26K | −3K | 0.22% | 17K | 1.5 |
| 2026-07-15 | 29K | +3K | 0.24% | 29K | 1.0 |