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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1. Name and Address of Reporting Person * Shelnitz Mark A   2. Issuer Name and Ticker or Trading Symbol W R GRACE & CO [GRA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Sr. VP, GC and Secretary (Last) (First) (Middle) C/O W. R. GRACE & CO., 7500 GRACE DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 02/22/2019 (Street) COLUMBIA, MD 21044 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, par value $0.01 per share 02/22/2019   M   1,323 (1) A (2) 61,238 D   Common Stock, par value $0.01 per share 02/22/2019   F   672 D $ 77.65 60,566 D   Common Stock, par value $0.01 per share 02/25/2019   M   912 (3) A (2) 61,478 D   Common Stock, par value $0.01 per share 02/25/2019   F   439 D $ 77.93 61,039 D   Common Stock, par value $0.01 per share 02/25/2019   A   6,572 A $ 0 67,611 D   Common Stock, par value $0.01 per share 02/25/2019   F   3,150 D $ 77.93 64,461 D   Common Stock, par value $0.01 per share               12,097 I By Trust (4)

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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

(5)

02/22/2019

M

1,323

(1)

(1)

Common Stock

1,323

$ 0

2,915

D

Employee Stock Options (rights to buy)

$ 78.115

02/25/2019

A

7,569

(6)

02/25/2029

Common Stock

7,569

$ 0

7,569

D

Restricted Stock Units

(5)

02/25/2019

A

1,760

(7)

(7)

Common Stock

1,760

$ 0

4,675

D

Restricted Stock Units

(5)

02/25/2019

M

912

(3)

(3)

Common Stock

912

$ 0

3,763

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Shelnitz Mark A C/O W. R. GRACE & CO. 7500 GRACE DRIVE COLUMBIA, MD 21044			Sr. VP, GC and Secretary

Signatures

/s/ Sean E. Dempsey, Attorney-in-Fact		02/26/2019
**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)	On February 23, 2017, the reporting person was granted 1,926 stock units, vesting annually in three substantially equal installments beginning on February 23, 2018, 642 of these stock units vested and settled on February 22, 2019. On February 22, 2018, the reporting person was granted 2,042 stock units, vesting in three substantially equal installments beginning on February 22, 2019, 681 of these stock units vested and settled on that date.
(2)	Restricted stock units converted into Common Stock on a one-for-one basis.
(3)	On February 25, 2016, the reporting person was granted 2,738 stock units, vesting annually in three substantially equal installments beginning on February 24, 2017, 912 of these stock units vested and settled on February 25, 2019.
(4)	Such shares are held in a trust established by the issuer for the benefit of certain officers and directors.
(5)	Each Restricted Stock Unit represents a contingent right to receive one share of Common Stock or at the Issuer's election, the cash value thereof.
(6)	Options become exercisable in three substantially equal annual installments beginning on February 25, 2020.
(7)	Restricted Stock Units vest in three substantially equal annual installments beginning on February 25, 2020, and will be settled within 60 days of those vesting dates.

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