U.S. stocks dropped after the biggest rally in nine months spurred speculation about excessive investor optimism. Treasuries stabilized, following a recent spike in yields. The dollar retreated.

Technology shares led losses in the S&P 500 as giants Apple Inc. and Tesla Inc. dragged down the Nasdaq 100 -- with the electric-car maker tumbling more than 4 per cent. Target Corp. slumped on an underwhelming profitability outlook. Rocket Cos., a Detroit-based holding company, soared after a news report that the stock could become a Reddit target for its high short-interest.

Bullishness among Wall Street strategists is near levels that have presaged potential trouble for stocks, according to a Bank of America Corp. gauge. The measure assesses the average recommended allocation to equities and is close to triggering a sell signal. A valuation methodology, sometimes called Fed model that compares corporate profits to bond rates, recently showed stocks were losing their edge. Earlier Tuesday, China’s top banking regulator said he’s “very worried” about risks from bubbles in global financial markets.

Last week, the correlation between real yields and U.S. equities dropped to its most-negative level in five years. That strong inverse relationship suggests inflation-adjusted Treasury rates have reached a point where further gains could quickly send the S&P 500 lower -- as they feed into steeper borrowing costs and lessen the appeal of other assets. The benchmark gauge of American shares has surged more than 70 per cent from its March 2020 lows.

For Bill Northey, senior investment director at U.S. Bank Wealth Management, rising rates are seen as an important element of what’s “giving investors pause at this point in time.” He also noted that they’re relevant when it comes to figuring out the appropriate level of valuations against the stream of corporate earnings.

“Did we come too far, too fast in pricing in a strong economy and corporate earnings recovery?” he said.

There are some key events to watch this week:

U.S. Federal Reserve Beige Book is due Wednesday.
OPEC+ meeting on output Thursday.
U.S. factory orders, initial jobless claims and durable goods orders are due Thursday.
The February U.S. employment report on Friday will provide an update on the speed and direction of the nation’s labor market recovery.

These are some of the main moves in markets:

Stocks

The S&P 500 fell 0.8 per cent as of 4 p.m. New York time.
The Stoxx Europe 600 Index increased 0.2 per cent.
The MSCI Asia Pacific Index declined 0.4 per cent.
The MSCI Emerging Market Index decreased 0.1 per cent.

Currencies

The Bloomberg Dollar Spot Index decreased 0.3 per cent.
The euro gained 0.3 per cent to US$1.2089.
The Japanese yen was unchanged at 106.76 per dollar.

Bonds

The yield on 10-year Treasuries dipped one basis point to 1.41 per cent.
Germany’s 10-year yield dipped two basis points to -0.35 per cent.
Britain’s 10-year yield decreased seven basis points to 0.687 per cent.

Commodities

West Texas Intermediate crude fell 1.7 per cent to US$59.59 a barrel.
Gold rose 0.5 per cent to US$1,734.01 an ounce.
Silver added 0.6 per cent to US$26.72 per ounce.

--With assistance from Andreea Papuc, Joanna Ossinger, Namitha Jagadeesh, Lynn Thomasson, Cormac Mullen and Lu Wang.