13G Filing: Palo Alto Investors and Epizyme Inc. (NASDAQ:EPZM)

Page 3 of 8 – SEC Filing

1. Names of Reporting Persons.

Anthony Joonkyoo Yun, MD

2. Check the Appropriate Box if
a Member of a Group (See Instructions)

(a)

(b) X

3. SEC Use Only

4. Citizenship or Place of Organization
U.S.A.

Number of

Shares

Beneficially

Owned by

Each Reporting

Person With:

5. Sole Voting Power 0

6. Shared Voting Power 4,699,675
7. Sole Dispositive Power 0
8. Shared Dispositive Power 4,699,675

9. Aggregate Amount Beneficially
Owned by Each Reporting Person 4,699,675

10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions)

11. Percent of Class Represented
by Amount in Row (9) 8.07%

12. Type of Reporting Person (See
Instructions) IN, HC

3

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