ETFs w/ most active options trading:

$SPDR S&P 500 ETF (SPY.US)$ - 7.649M
$Invesco QQQ Trust (QQQ.US)$ - 3.231M
$iShares Russell 2000 ETF (IWM.US)$ - 555k
$Ishares Iboxx $ High Yield Corporate Bond Etf (HYG.US)$ - 470k
$iShares MSCI Emerging Markets ETF (EEM.US)$ - 375k
$ProShares UltraPro QQQ ETF (TQQQ.US)$ - 300k
$ProShares UltraPro Short QQQ ETF (SQQQ.US)$ - 263k
$Advisorshares Trust Pure Us Cannabis Etf (MSOS.US)$ - 206k
$iShares 20+ Year Treasury Bond ETF (TLT.US)$ - 206k
$iShares China Large-Cap ETF (FXI.US)$ - 169k
$iShares MSCI Brazil ETF (EWZ.US)$ - 169k
$Spdr Series Trust S&P Regional Bkg Etf (KRE.US)$ - 164k
$iShares Silver Trust (SLV.US)$ - 132k
$Financial Select Sector SPDR Fund (XLF.US)$ - 122k
$SPDR Gold ETF (GLD.US)$ - 111k
$Direxion Daily Semiconductor Bull 3x Shares ETF (SOXL.US)$ - 107k
$ProShares Ultra VIX Short-Term Futures ETF (UVXY.US)$ - 101k
$Energy Select Sector SPDR Fund (XLE.US)$ - 99k
$iShares MSCI EAFE ETF (EFA.US)$ - 94k