The information on this webpage pertains to the Class B stock owned by members of Mastercard.

Important Information

Upcoming Blackout periods for the Open Conversion Program

Conversion and Sale Instruction Forms – Submitted between April 3, 2024 and April 9, 2024 will be reviewed upon receipt and if approved, the stock tendered will be converted on April 10, 2024.

Conversion and Transfer Instruction Forms – Submitted between March 20, 2024 and April 19, 2024 will be reviewed upon receipt and if approved the stock tendered will be converted on April 22, 2024.

Important Notice

EQ Shareowner Services (“EQ”) is Mastercard’s Transfer Agent, Registrar, and Dividend Disbursing Agent.

Prior to accessing your company’s Mastercard Class B transfer agent account online, the current Mastercard Class B Shareowner contact on record must contact EQ to authenticate the account.

Shareholders who need to convert and sell or update account information must complete the appropriate forms located on the EQ website and submit them to EQ via certified mail or overnight delivery.

Contact EQ:


Shareowner Relations Specialists are available Monday – Friday, from 7:00 a.m. to 7:00 p.m. Central Standard Time.
Toll-Free: 800-837-7579
Outside the United States: 651-450-4064

Written Correspondence
EQ Shareowner Services
P.O. Box 64874
St. Paul, MN 55164

Certified and Overnight Delivery
EQ Shareowner Services
1110 Centre Pointe Curve, Suite 101
Mendota Heights, MN 55180