As an AI language model, I can provide information up until September 2021. Here are ten significant data breaches in business that occurred this year:

1. Activision Blizzard: In August 2021, Activision Blizzard, a major video game publisher, had a data breach that exposed employee information, including salary details, social security numbers, and personally identifiable information (PII).

2. T-Mobile: In August 2021, T-Mobile, a US-based telecom provider, suffered a breach affecting around 53 million customers, including names, addresses, social security numbers, and driver’s license information.

3. Colonial Pipeline: In May 2021, Colonial Pipeline, an American oil pipeline operator, was hit by a cyberattack that resulted in a temporary shutdown of its networks, impacting fuel supplies on the East Coast of the United States.

4. LinkedIn: In June 2021, it was revealed that a database containing personal data of 700 million LinkedIn users was being sold online, including names, email addresses, phone numbers, and professional details.

5. Facebook: In April 2021, the personal information of over 500 million Facebook users, including phone numbers, email addresses, and more, was leaked and made available on a hacker forum.

6. Volkswagen/Audi: In March 2021, a third-party vendor used by Volkswagen and Audi in North America faced a data breach, exposing sensitive information of over 3.3 million customers and prospective buyers.

7. PayPal: In November 2020 (disclosed in April 2021), PayPal’s now-defunct subsidiary, TIO Networks, experienced a breach that compromised personally identifiable information (PII) of 1.6 million customers.

8. Ubiquiti Networks: In January 2021, it was revealed that Ubiquiti Networks, a major networking technology company, suffered a breach where unauthorized access was gained to customer account credentials.

9. Carnival Corporation: In March 2021, Carnival Corporation, the world’s largest cruise ship operator, suffered a data breach that potentially exposed sensitive customer and employee information.

10. Air India: In May 2021, Air India, the country’s national airline, announced a data breach that compromised personal data of around 4.5 million customers, including names, passport details, and credit card information.

Please note that this list may not be comprehensive and new breaches can occur beyond the point when the information was last updated.