SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

GANTZ WILBUR H

(Last)

(First)

(Middle)

C/O APTINYX INC.

909 DAVIS STREET, SUITE 600

(Street)

EVANSTON

60201

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
06/20/2018

3. Issuer Name and Ticker or Trading Symbol
Aptinyx Inc. [ APTX ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	108,622	I	See footnote⁽¹⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Series A-1 Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	84,643	⁽²⁾	I	See footnote⁽¹⁾
Series A-1 Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	25,392	⁽²⁾	I	See footnote⁽³⁾
Series A-2 Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	96,733	⁽²⁾	I	See footnote⁽¹⁾
Series A-2 Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	29,020	⁽²⁾	I	See footnote⁽³⁾
Series B Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	65,516	⁽²⁾	I	See footnote⁽¹⁾
Series B Convertible Preferred Stock	⁽²⁾	⁽²⁾	Common Stock	19,655	⁽²⁾	I	See footnote⁽³⁾

Explanation of Responses:

1. The shares are held directly by Wilbur H. Gantz III Revocable Trust, of which the reporting person is the trustee. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein.

2. All series of convertible preferred stock will automatically convert into the number of shares of the Issuer's common stock on a 27.58621-for-1 basis immediately prior to the closing of the Issuer's initial public offering and have no expiration date.

3. The shares are held directly by LMC Holdings, LLC of which the reporting person is the manager. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Wilbur H. Gantz	06/20/2018
	** 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 5 (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.
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