There are four dates associated with any stock event. The announcement date. The Record Date, specified in the announcement, the date used to determine the number of shares or amount of cash each shareholder receives. The next stock market business day is the Effective Date. The Distribution Date, usually weeks later, is the actual distribution of the additional shares or cash. This table is sorted by Effective Date.

Compare the date when you first acquired Compaq stock with the dates in the left-hand column. If you acquired DEC or Tandem stock before those companies were bought by Compaq, those batches of stock should be tracked separately. HPAA's Complete Stock Decoder Tables for: DEC    Tandem 

HP's purchase of Compaq was closed on May 3, 2002. Compaq shareholders received 0.6325 share of HPQ in exchange for each CPQ share -- 18% over market price. CPQ stock was retired. HWP stock symbol changed to HPQ.

HP Inc. is the legal successor to Compaq.  Stockholder information and contact instructions: HPInc Investor Relations Site https://investor.hp.com/resources/contact-ir/default.aspx (scroll down)

For links and more detail on HP stock history, see our HP Stock Decoder

If you have paper stock certificates. What to do: Stock Certificates

Check state unclaimed property sites for lost shares, uncashed stock-buyout or dividend checks, and other stray money.  How to check for lost stock, dividends, and other unclaimed property

See also Details and HPAA advice for former CPQ employee shareholders

The table below is from the online system available to customers of one broker, Charles Schwab & Co. The HPAA member who contributed this table did not hold this stock before 1990.

Note: Members have found that plan administrators, transfer agents, and brokerages vary significantly in how (or if) they track gain/loss and cost basis for the many complex HP-related stock events -- and what (if anything) they report to the IRS. Issues with major brokers

The same four splits are listed in the last pre-merger copy of Compaq's Investor Relations website in the Internet Archive. "Compaq stock has split four times since it began trading in 1983."

This table only covers stock HP/HPE events through 04/30/2019. See our HP Stock Decoder for subsequent HP/HPE-related stock events.