We are seeing unusual levels of bullish sentiment in the CBOE equity put-call ratio, with the lowest level of put buying relative to call purchases since the market rally began. Indeed, the excellent SentimenTrader site reports that we haven't seen such bullish options sentiment since 2000, which marked a very important stock market peak.
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Meanwhile, we saw 301 new 52-week highs among NYSE common stocks, as reported by Decision Point, but that is down from levels reached last week. When bullish sentiment cannot translate into incremental market strength, that turns me cautious.