Stock market optimism among Wall Street strategists has risen close to levels that signaled trouble for equities in the past.

A Bank of America measure of their bullishness is near a level that historically has been bearish for stocks. The gauge assesses the average recommended allocation to equities by sell-side strategists and is very close to triggering a sell signal, a team including Savita Subramanian wrote Monday.

“The last time the indicator was this close to ‘Sell’ was June 2007 after which we generally saw 12-month returns of minus 13 per cent,” the strategists said, adding even current levels signal below-average equity returns over the next year. “We‘ve found Wall Street bullishness to be a reliable contrarian indicator.”

Last week’s worries about the impact of higher bond yields on stocks evaporated Monday, with U.S. equities notching their biggest advance since June. Optimism is evident from the record amount of cash poured into stock ETFs in February as investors bet additional fiscal stimulus and the COVID-19 vaccine rollout will supercharge growth.

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The S&P 500 has risen about 4 per cent so far this year, and is up about 32 per cent over the last 12 months. The Bank of America gauge climbed nearly 1 point to 59.2 per cent in February.

“The current level is forecasting 12-month returns of just 7 per cent, a much weaker outlook compared to an average 12-month forecast of 16 per cent since the end of the Global Financial Crisis,” the BofA team wrote.