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^*

RENSCHLER MARKUS MD

(Last)

(First)

(Middle)

128 SPRING ST, BUILDING A, SUITE 510

(Street)

LEXINGTON

02421

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
06/17/2021

3. Issuer Name and Ticker or Trading Symbol
Cyteir Therapeutics, Inc. [ CYT ]

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

X	Director	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)
Common Stock	841,954⁽¹⁾	D

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)
Stock Option (Right to Buy)	⁽²⁾	12/10/2028	Common Stock	106,342	$1.02	D
Stock Option (Right to Buy)	⁽³⁾	02/24/2030	Common Stock	63,408	$1.19	D
Stock Option (Right to Buy)	⁽⁴⁾	02/21/2031	Common Stock	500,344	$7.09	D

Explanation of Responses:

1. Includes 125,226 shares acquired upon early exercise of an option, which are subject to forfeiture until they vest.

2. The option vests at a rate of 18,337 shares per month at the end of each successive one-month period beginning January 3, 2019, for 40 months, and at a rate of 14,670 shares per month at the end of the 41st month, at which point the option is fully vested, subject to the Reporting Person's continued employment with the Issuer through the applicable vesting date.

3. The option vested as to 1/48th of the underlying shares of common stock on February 1, 2020, and at the same rate at the end of each successive one-month period following such date until the fourth anniversary of such date, subject to the Reporting Person's continued employment with the Issuer through the applicable vesting date.

4. The option will become exercisable as to 1/36th of the underlying shares of common stock at the end of each successive one-month period following the vesting commencement date, February 5, 2021, until the option is fully vested on the third anniversary of the vesting commencement date, subject to the Reporting Person's continued employment with the Issuer through the applicable vesting date .

Remarks:

President and Chief Executive Officer Exhibit List: Exhibit 24 - Power of Attorney

	By: /s/ Andrew Gengos, Attorney-in-Fact	06/17/2021
	** 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.
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 Number.