Historical stock prices for Blackrock Preferred And Corporate (PSW). BlackRock Credit Allocation Income Trust I, Inc. (the Fund), formerly BlackRock Preferred and Corporate Income Strategies Fund, Inc., is a diversified, closed-end management investment company. The Fund's investment objective is to provide common shareholders with high current income. The Fund seeks to achieve its investment objective by investing, at least 80% of its assets in credit-related securities, including, but not limited to, investment grade corporate bonds, high yield bonds (junk bonds), bank loans, preferred securities or convertible bonds or derivatives with economic characteristics similar to these credit-related securities. The Fund's investment advisor is BlackRock Advisors, LLC, an indirect, wholly owned subsidiary of BlackRock, Inc. Its sub-advisor is BlackRock Investment Management, Inc.