U.S. stock futures pointed to a flat open on Tuesday after data showed April home prices in 20 U.S. cities declined, but less than expected.

Standard & Poor’s/Case Shiller 20-city home price index fell 0.6 percent in April, after a 2.2 percent decline the month before. Economists expected an April drop of 1.8 percent

“It’s a little better than expected, but not much. On a top to bottom basis, home prices are down 30 plus percent, which underscores the amount that home prices have to climb to get to normal territory,” said Dan Greenhaus, an analyst at Miller Tabak & Co in New York.

“While they’re better than expected in the short term, in the larger sense the housing market remains under great pressure.”

On this last day of the quarter, fund managers often enhance portfolios as part of “window dressing” by selling losing stocks and scooping up the winners. The process can add to volatility.

Analysts noted the shortened week could lead to thinner volumes and increased volatility. U.S. markets will be shut for the U.S. Independence Day holiday on Friday.

S&P 500 futures rose 2.20 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futuresgained 29 points, and Nasdaq 100 futures added 2.75 of a point.

The S&P 500 is up 16.2 percent so far this quarter, putting it on track for its best period since the fourth quarter of 1998, when the index jumped nearly 21 percent. The S&P 500 has gained 37 percent since hitting a 12-year closing low in early March as early signs of an economic rebound surfaced.

NEW YORK, June 30 (Reuters)