Benzinga's Top Upgrades (NSM, PPS, ABB, AVB)

National Semiconductor Corporation

was upgraded by FBR Capital from "market perform" to "outperform." NSM's shares closed at $14.11 yesterday. Shares of National Semiconductor have moved down 6.37% year-to-date. Analysts at Keefe Bruyette upgrade Post Properties Inc

from "market perform" to "outperform." PPS' shares closed at $34.52 yesterday. Shares of Post Properties have surged 80.54% so far this year. Exane BNP Paribas upgrade ABB Ltd

from "underperform" to "neutral." ABB's shares closed at $20.12 yesterday. Shares of ABB have moved up 8.11% so far this year. Keefe Bruyette upgrade AvalonBay Communities Inc

from "market perform" to "outperform." AVB's shares closed at $113.41 yesterday. Shares of AvalonBay Communities have gained 41.99% year-to-date.