looking for historical stock closing price (as of 2/20/2006 or last trading date before) for Sierra Pacific Resources which later became NV Energy (NVE) and was purchased by a Berkshire Hathaway sub in 2013. NVE search does not yield any info. can anyone offer any suggestions?
You need a source of delisted historical data. Such data is typically only available from paid sources.
According to my records 20 Feb 2006 was not a trading day - it was Preisdent's Day and the US exchanges were closed.
The prior trading date to this was 17 Feb 2006 where the stock had the following data: Open: 14.40 High 14.46 Low 14.16 Close 14.32 Volume 1339800 (consolidated volume)
Source: Symbol NVE-201312 within Premium Data US delisted stocks historical data set available from http://www.premiumdata.net/products/premiumdata/ushistorical.php
Disclosure: I am a co-owner of Norgate / Premium Data.