Wall Street wealth management and investment software provider Addepar Inc. is in talks to raise $250 million, according to people familiar with the matter.The startup, which serves more than 1,200 institutions including banks such as Morgan Stanley, Jefferies and HSBC, has a pre-money valuation of $3.25 billion, said the people, who asked not to be named discussing private information. Co-founder Joe Lonsdale is investing via his venture firm 8VC, and existing investors including Valor Equity P...