Assuming everything else is constant, when a stock goes ex-rights its price should:

Question

Quizplus · Accepted Answer

When a stock goes ex-rights, the stockholders lose the right to purchase additional shares at a discounted price, and this can lead to a decrease in the stock price, assuming everything else is constant. This is because the option that they had prior to the ex-rights date is no longer available, and so the value of the stock decreases to reflect this change. An efficient market would anticipate this change, but it would still result in a decrease in the stock price.

Assuming Everything Else Is Constant, When a Stock Goes Ex-Rights