From Apple’s site:
At times Apple may make certain personal information available to strategic partners that work with Apple to provide products and services, or that help Apple market to customers.
From Google’s:
We will share personal information with companies, organizations or individuals outside of Google when we have your consent to do so. We require opt-in consent for the sharing of any sensitive personal information.
From Microsoft’s:
We share your personal data with your consent or as necessary to complete any transaction or provide any service you have requested or authorized. We also share data with Microsoft-controlled affiliates and subsidiaries; with vendors working on our behalf; when required by law or to respond to legal process; to protect our customers; to protect lives; to maintain the security of our services; and to protect the rights or property of Microsoft.
Apple and Microsoft outright state they share your data with other companies, without explicitly asking permission. Google’s site states that they also share your data with other companies, but only if you consent to the sharing. In the case of all these companies, personal data refers to your name, email address, home address, credit card number, location history, demographic data, your contacts, and more.