Case-Shiller: National House Price Index Increased 20.4% Year-over-year in April

Note: S&P hasn't updated their data yet.

From Diana Olick at CNBC: Home price increases slowed for the first time in months in April, says S&P Case-Shiller

Prices rose 20.4% nationally in April compared with the same month a year ago, according to the S&P CoreLogic Case-Shiller Index. In March, home prices grew 20.6%. ...

The 10-city composite annual increase was 19.7%, up from 19.5% in March. The 20-city composite posted a 21.2% annual gain, up from 21.1% in the previous month.

This was slightly below expectation.

Note that this monthly home price index release was for April, and "April" is a 3-month average of February, March and April closing prices. February closing prices include some contracts signed last December, so there is a significant lag to this data.