Father died in 2017. While living in New York, many years ago, he worked for life insurance company.

[Treasur2]

My father and mother lived in New York. My father worked for a life insurance company. The company gave him stock during a demutualization in the year 2000. 

They moved to Washington state, a community property state. My father died in 2017. My mother had the stock reissued in her name only so that she could sell it., which took place in 2018. I know the price on that date and of course the sales amount but what is the basis, and how do I determine it. I don't know how the stock had his or their names prior to her changing it to hers only.

[JulieR]

Have you contacted the brokerage that reissued the stock in your mother's name?

[Treasur2]

Yes. they only told me the price on the day it was retitled.

[Treasur2]

Even if her name was not on the stock when it was issued?

[JulieR · Accepted solution]

Your mother's cost basis is the market value of the stock on your father's date of death. You can do an internet search for a site that will look up historical stock prices. Here is a link to one site: http://www.marketwatch.com/tools/quotes/historical.asp