$DUOL
stock+ Make pickLast price
$141.90
Today
▼ 3.54%
Open
$146.50
Day range
$141.85 – $146.63
Volume
1.4M
52-wk range
$87.89 – $353.00
Fails-to-deliver = shares that weren't delivered to settle a trade by the due date. Persistent spikes are a classic short-squeeze / illiquidity tell the degen crowd watches.
source: SEC fails-to-deliver data · free · updated twice monthly (~3–4 wk lag)
source: FINRA OTC Transparency (ATS + non-ATS) · free · weekly, ~2–4 wk lag