The weird thing about the current low reading is that it has occurred during a pullback in $SPX. In almost all  of the snapshots posted below, the low reading of the TRIN 10 dma occurred at the end of strong up moves. 

    According to Investopedia, The Arms Index moves opposite the price trajectory of the Index. A strong price rally will see TRIN move to lower levels. A falling index will see TRIN push higher. TRIN will be below 1 when advancing stocks are the major source of volume. 

    $NYUD has been a lot stronger than $NYAD during the recent decline in $SPX, so that would explain the low TRIN readings. Maybe the snapshots of past low readings don't apply to the current situation because they happened under different circumstances. I guess we'll find out this week.

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