The Duckhorn Portfolio intends to make its stock market debut in coming months, the St. Helena-based wine producer confirmed via press release yesterday. The company has filed a registration statement with the Securities and Exchange Commission (SEC), according to the press release â a key step toward making an initial public offering (IPO) of its stock on the New York Stock Exchange. News of the companyâs intent to do so was first reported by Bloomberg in early February. âThe number of shares to be offered and the price range for the proposed offering have not yet been determined,â Duckhorn wrote in its press release. âDuckhorn intends to apply to list its common stock on the New York Stock Exchange under the symbol âNAPA.ââ