Russo Rene Form 3 Arsanis / Rene Russo ownership change

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^*

Russo Rene

(Last) (First) (Middle)

C/O ARSANIS, INC.

890 WINTER STREET, SUITE 230

(Street)

WALTHAM MA 02451

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
11/15/2017

3. Issuer Name and Ticker or Trading Symbol
Arsanis, Inc. [ ASNS ]

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

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

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)

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)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	(1)	07/21/2025	Common Stock	80,889	8.2	D
Stock Option (right to buy)	(2)	07/19/2026	Common Stock	47,757	9.39	D
Stock Option (right to buy)	(3)	06/18/2027	Common Stock	195,331	4	D

Explanation of Responses:

1. This option was granted on July 22, 2015 and vests over four years, with 25% of the original 80,889 shares underlying the option having vested on July 22, 2016, and 2.0833% of the original 80,889 shares vesting monthly thereafter, subject to continued service.

2. This option was granted on July 20, 2016 and vests over four years, with 25% of the original 47,757 shares underlying the option having vested on July 20, 2017, and 2.0833% of the original 47,757 shares vesting monthly thereafter, subject to continued service.

3. This option was granted on June 19, 2017 and vests over four years, with 25% of the original 195,331 shares underlying the option vesting on June 19, 2018, and 2.0833% of the original 195,331 shares vesting monthly thereafter, subject to continued service.

Remarks:

President and Chief Executive Officer Exhibit Index: 24.1 Power of Attorney

	/s/ Mike Gray, attorney-in-fact	11/15/2017
	** 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).
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