Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Dalton Lisa
  2. Issuer Name and Ticker or Trading Symbol
Spark Therapeutics, Inc. [ONCE]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Chief Human Resource Officer
(Last)
(First)
(Middle)
3737 MARKET STREET, SUITE 1300
3. Date of Earliest Transaction (Month/Day/Year)
01/18/2019
(Street)

PHILADELPHIA, PA 19104
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 01/18/2019   M   2,162 A (1) 3,547 D  
Common Stock 01/18/2019   F   792 D $ 45.08 2,755 D  
Common Stock 01/18/2019   M   2,000 A (1) 4,755 D  
Common Stock 01/18/2019   F   621 D $ 45.08 4,134 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (2) 01/18/2019   M     2,162   (3)   (3) Common Stock 2,162 $ 0 4,325 D  
Restricted Stock Units (2) 01/18/2019   M     2,000   (4)   (4) Common Stock 2,000 $ 0 6,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Dalton Lisa
3737 MARKET STREET
SUITE 1300
PHILADELPHIA, PA 19104
      Chief Human Resource Officer  

Signatures

 /s/ Joseph W. La Barge, attorney-in-fact for Lisa Dalton   01/23/2019
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Each restricted stock unit converted into one share of Spark Therapeutics, Inc. common stock.
(2) Each restricted stock unit represents a contingent right to receive one share of Spark Therapeutic's Inc. common stock.
(3) On January 18, 2017, the reporting person was granted 7,000 restricted stock units that vest in four equal annual installments beginning January 18, 2018. Vested shares will be delivered to the reporting person annually on the vesting date.
(4) On January 18, 2018, the reporting person was granted 8,000 restricted stock units that vest in four equal annual installments beginning January 18, 2019. Vested shares will be delivered to the reporting person annually on the vesting date.

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