Statement of Changes in Beneficial Ownership (4)

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	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * Black Archie C.	2. Issuer Name and Ticker or Trading Symbol SPS COMMERCE INC [ SPSC ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __ X __ Director                      _____ 10% Owner __ X __ Officer (give title below)      _____ Other (specify below) CEO
(Last)          (First)          (Middle) 333 SOUTH SEVENTH STREET, SUITE 1000	3. Date of Earliest Transaction (MM/DD/YYYY) 8/15/2018
(Street) MINNEAPOLIS, MN 55402 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _ X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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	8/15/2018		M		31521	A	$25.32	121845	D
Common Stock	8/15/2018		S (1)		26921	D	$90.6265   (2)	94924	D
Common Stock	8/15/2018		S (1)		4000	D	$91.9295   (3)	90924	D
Common Stock	8/15/2018		S (1)		600	D	$92.8333   (4)	90324	D
Common Stock								200	I	By Son-I
Common Stock								200	I	By Son-II
Common Stock								200	I	By Son-III
Common Stock								200	I	By Son-IV

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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
Employee Stock Option (right to buy)	$25.32	8/15/2018		M			31521	(5)	2/9/2022	Common Stock	31521	$0.00	0	D

Explanation of Responses:
(1)	The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 4, 2018.
(2)	Reflects the weighted average price of 26,921 shares of Common Stock of the Issuer sold by the reporting person in multiple transactions on August 15, 2018 with sales prices ranging from $90.66 to $91.65 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.
(3)	Reflects the weighted average price of 4,000 shares of Common Stock of the Issuer sold by the reporting person in multiple transactions on August 15, 2018 with sales prices ranging from $91.68 to $92.66 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.
(4)	Reflects the weighted average price of 600 shares of Common Stock of the Issuer sold by the reporting person in multiple transactions on August 15, 2018 with sales prices ranging from $92.76 to $93.20 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.
(5)	Fully vested.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Black Archie C. 333 SOUTH SEVENTH STREET SUITE 1000 MINNEAPOLIS, MN 55402	X		CEO

Signatures
/s/ Jonathan R. Zimmerman, Attorney-in-Fact for Archie C. Black		8/17/2018
** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	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).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.