Filing Details

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Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

Sole Voting Power

2,083,887

Shared Voting Power

0

Sole Dispositive Power

2,083,887

Shared Dispositive Power

0

Accession Number:: 0001193125-20-213216
Form Type:: 13D Filing
Publication Date:: 2020-08-07 17:42:05

Filed By:: Mpm Bioventures 2014, L.p.
Company:: Iteos Therapeutics Inc. (NASDAQ:ITOS)
Filing Date:: 2020-08-10
SEC Url:: 13D Filing

Ownership Summary

Please notice the below summary table is generated without human intervention and may contain errors. Please refer to the complete filing displayed below for exact figures.

Sole Voting Power	Shared Voting Power	Sole Dispositive Power	Shared Dispositive Power	Aggregate Amount Owned Power	Percent of Class
2,083,887	0	2,083,887	0	2,083,887	6.2%
138,985	0	138,985	0	138,985	0.4%
71,727	0	71,727	0	71,727	0.2%
1,316,139	0	1,316,139	0	1,316,139	3.9%
69,951	0	69,951	0	69,951	0.2%
25,974	0	25,974	0	25,974	0.1%
2,355,557	0	2,355,557	0	2,355,557	7.1%
0	2,222,872	0	2,222,872	2,222,872	6.7%
0	2,294,599	0	2,294,599	2,294,599	6.9%
0	1,386,090	0	1,386,090	1,386,090	4.2%
0	1,412,064	0	1,412,064	1,412,064	4.2%
2,355,557	0	2,355,557	0	2,355,557	7.1%
2,355,557	0	2,355,557	0	2,355,557	7.1%
2,355,557	0	2,355,557	0	2,355,557	7.1%
0	6,062,220	0	6,062,220	6,062,220	18.1%
0	3,706,663	0	3,706,663	3,706,663	11.1%
0	3,706,663	0	3,706,663	3,706,633	11.1%
0	1,412,064	0	1,412,064	1,412,064	4.2%

Filing

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13D

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. )*

iTeos Therapeutics, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

46565G104

(CUSIP Number)

Luke Evnin

MPM Asset Management

450 Kendall Street

Cambridge, MA 01242

Telephone: (617) 425-9200

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

July 28, 2020

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are to be sent.

*	The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM BioVentures 2014, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)

This schedule is filed by MPM BioVentures 2014, L.P. (BV 2014), MPM BioVentures 2014 (B), L.P. (BV 2014(B)), MPM Asset Management Investors BV2014 LLC (AM BV2014 LLC), MPM BioVentures 2018, L.P. (BV 2018), MPM BioVentures 2018 (B), L.P. (BV 2018(B)), MPM Asset Management Investors BV2018 LLC (AM BV2018 LLC), UBS Oncology Impact Fund L.P. (UBS Oncology), MPM BioVentures 2014 GP LLC (BV 2014 GP), MPM BioVentures 2014 LLC (BV 2014 LLC), MPM BioVentures 2018 GP LLC (BV 2018 GP), MPM BioVentures 2018 LLC (BV 2018 LLC), Oncology Impact Fund (Cayman) Management LP (Oncology Cayman), MPM Oncology Impact Management LP (Oncology LP) and MPM Oncology Impact Management GP LLC (Oncology GP) (collectively, the MPM Entities) and Ansbert Gadicke, Luke Evnin, Todd Foley and Edward Hurwitz (collectively, the Listed Persons and together with the MPM Entities, the Filing Persons). The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

This percentage is calculated based upon 33,434,807 shares of the Issuers common stock outstanding upon completion of the Issuers initial public offering, as set forth in the Issuers final prospectus dated July 23, 2020 with respect to such offering, filed with the Securities and Exchange Commission on July 27, 2020.

Page 2

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM BioVentures 2014 (B), L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Page 3

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM Asset Management Investors BV2014 LLC
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Page 4

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM BioVentures 2018, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Page 5

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM BioVentures 2018 (B), L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Page 6

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM Asset Management Investors BV2018 LLC
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Page 7

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) UBS Oncology Impact Fund, L.P.
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Page 8

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM BioVentures 2014 GP LLC
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)	Includes 2,083,887 shares held by BV 2014 and 138,985 shares held by BV 2014(B). BV 2014 GP and BV 2014 LLC are the direct and indirect general partners of BV 2014 and BV 2014(B).

(3)

Page 9

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM BioVentures 2014 LLC
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)	Includes 2,083,887 shares held by BV 2014, 138,985 shares held by BV 2014(B) and 71,727 shares held by AM BV2014 LLC. BV 2014 GP and BV 2014 LLC are the direct and indirect general partners of BV 2014 and BV 2014(B). BV 2014 LLC is the manager of AM BV2014 LLC

(3)

Page 10

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM BioVentures 2018 GP LLC
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)	Includes 1,316,139 shares held by BV 2018 and 69,951 shares held by BV 2018(B). BV 2018 GP and BV 2018 LLC are the direct and indirect general partners of BV 2018 and BV 2018(B).

(3)

Page 11

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM BioVentures 2018 LLC
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)	Includes 1,316,139 shares held by BV 2018, 69,951 shares held by BV 2018(B) and 25,974 shares held by AM BV2018 LLC. BV 2018 GP and BV 2018 LLC are the direct and indirect general partners of BV 2018 and BV 2018(B). BV 2018 LLC is the manager of AM BV2018 LLC.

(3)

Page 12

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) Oncology Impact Fund (Cayman) LP
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)	Consists of shares held by UBS Oncology. Oncology GP is the general partner of Oncology LP, the General Partner of Oncology (Cayman), the General Partner of UBS Oncology.

(3)

Page 13

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM Oncology Impact Management LP
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)	Consists of shares held by UBS Oncology. Oncology GP is the general partner of Oncology LP, the General Partner of Oncology (Cayman), the General Partner of UBS Oncology.

(3)

Page 14

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) MPM Oncology Impact Management GP LLC
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) WC
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization Delaware

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)	Consists of shares held by UBS Oncology. Oncology GP is the general partner of Oncology LP, the General Partner of Oncology (Cayman), the General Partner of UBS Oncology.

(3)

Page 15

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) Ansbert Gadicke
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) OO
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Includes 2,083,887 shares held by BV 2014, 138,985 shares held by BV 2014(B), 71,727 shares held by AM BV 2014 LLC, 1,316,139 share held by BV 2018, 69,951 shares held by BV 2018(B), 25,974 shares held by AM BV 2018 LLC and 2,355,557 shares held by UBS Oncology. The Reporting Person is managing director of BV 2014 LLC, a managing director of BV2018 LLC and the managing director of Oncology GP.

(3)

Page 16

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) Luke Evnin
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) OO
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Includes 2,083,887 shares held by BV 2014, 138,985 shares held by BV 2014(B), 71,727 shares held by AM BV 2014 LLC, 1,316,139 share held by BV 2018, 69,951 shares held by BV 2018(B) and 25,974 shares held by AM BV 2018 LLC. The Reporting Person is a managing director of BV 2014 LLC and a managing director of BV 2018 LLC..

(3)

Page 17

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) Todd Foley
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) OO
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)

Includes 2,083,887 shares held by BV 2014, 138,985 shares held by BV 2014(B), 71,727 shares held by AM BV 2014 LLC, 1,316,139 share held by BV 2018, 69,951 shares held by BV 2018(B) and 25,974 shares held by AM BV 2018 LLC. The Reporting Person is managing director of BV 2014 LLC and a managing director of BV 2018 LLC..

(3)

Page 18

CUSIP No. 46565G104


1.		Name of Reporting Persons. I.R.S. Identification No(s). of above person(s) (entities only) Edward Hurwitz
2.		Check the Appropriate Box if a Member of a Group (See Instructions) (a) ☐ (b) ☒ (1)
3.		SEC USE ONLY
4.		Source of Funds (See Instructions) OO
5.		Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ☐
6.		Citizenship or Place of Organization United States

(1)	This Schedule is filed by the MPM Entities and the Listed Persons. The MPM Entities and the Listed Persons expressly disclaim status as a group for purposes of this Schedule 13D.

(2)	Includes 1,316,139 shares held by BV 2018, 69,951 shares held by BV 2018(B) and 25,974 shares held by AM BV 2018 LLC . The Reporting Person is a managing director of BV 2018 LLC.

(3)

Page 19

Item 1.

Security and Issuer.

This Schedule 13D (this Schedule 13D) relates to the common stock (the Common Stock) of iTeos Therapeutics, Inc. (the Issuer). The Issuers principal executive office is located at 139 Main Street, Cambridge, MA 02141.

Item 2.

Identity and Background

(a) The entities and persons filing this statement are MPM BioVentures 2014, L.P. (BV 2014), MPM BioVentures 2014 (B), L.P. (BV 2014(B)), MPM Asset Management Investors BV2014 LLC (AM BV2014 LLC), MPM BioVentures 2018, L.P. (BV 2018), MPM BioVentures 2018 (B), L.P. (BV 2018(B)), MPM Asset Management Investors BV2018 LLC (AM BV2018 LLC), UBS Oncology Impact Fund L.P. (UBS Oncology), MPM BioVentures 2014 GP LLC (BV 2014 GP), MPM BioVentures 2014 LLC (BV 2014 LLC),), MPM BioVentures 2018 GP LLC (BV 2018 GP), MPM BioVentures 2018 LLC (BV 2018 LLC) Oncology Impact Fund (Cayman) Management LP (Oncology Cayman), MPM Oncology Impact Management LP (Oncology LP) and MPM Oncology Impact Management GP LLC (Oncology GP) (collectively, the MPM Entities) and Ansbert Gadicke, Luke Evnin, Todd Foley and Edward Hurwitz (collectively, the Listed Persons and together with the MPM Entities, the Filing Persons).

(b) The address of the principal place of business for each of the MPM Entities and Ansbert Gadicke, Luke Evnin, Todd Foley and Edward Hurwitz is 450 Kendall Street, Cambridge, MA 02142, other than UBS Oncology and Oncology Cayman whose address is 1^st Floor, 2 Hill Street, St Helier, Jersey, JE1 4FS.

(d) During the last five years, none of the Filing Persons has been convicted in any criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) During the last five years, none of the Filing Persons has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree, or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) Each of the Listed Persons is a United States citizen and each of the MPM Entities is a Delaware limited partnership or limited liability company, other than UBS Oncology and Oncology Cayman which are Cayman Islands limited partnerships.

In accordance with the provisions of General Instruction C to Schedule 13D, information concerning the managers and each other person controlling the general partners of the MPM Entities required by Item 2 of Schedule 13D is listed on Schedule 1 hereto and is incorporated by reference herein.

Item 3.

Source and Amount of Funds or Other Consideration

On July 23, 2020, the Registration Statement on Form S-1 filed with the Securities and Exchange Commission by the Issuer (File No. 333-239415) in connection with its initial public offering of 10,586,316 Common Stock (the IPO) was declared effective. The closing of the IPO took place on July 28, 2020, and at such closing the MPM Entities purchased an aggregate of 320,000 shares of Common Stock at the initial public offering price of $19.00 per share, for an aggregate purchase price of $6,080,000. The source of funds for such purchases was the capital contributions made to the MPM Entities by their respective partners and members. The shares were purchased as follows:

BV 2014: 89,955 shares

BV 2014(B): 5,994 shares

AM BV2014 LLC: 3,096 shares

BV 2018: 56,814 shares

BV 2018(B): 3,020 shares

AM BV2018 LLC: 1,121 shares

UBS Oncology: 160,000 shares

Page 20

Item 4.

Purpose of Transaction

The MPM Entities purchased the Common Stock of the Issuer in the initial public offering for investment purposes.

Ansbert Gadicke is a member of the Board of Directors of the Issuer and is also a managing director of BV 2014 LLC and BV 2018 LLC and the managing director of Oncology GP.

Subject to applicable legal requirements, one or more of the Filing Persons may purchase additional securities of the Issuer from time to time in open market or private transactions, depending on their evaluation of the Issuers business, prospects and financial condition, the market for the Issuers securities, other developments concerning the Issuer, the reaction of the Issuer to the Filing Persons ownership of the Issuers securities, other opportunities available to the Filing Persons, and general economic, money market and stock market conditions. In addition, depending upon the factors referred to above, the Filing Persons may dispose of all or a portion of their securities of the Issuer at any time. Each of the Filing Persons reserves the right to increase or decrease its holdings on such terms and at such times as each may decide.

Other than as described above in this Item 4, none of the Filing Persons have any plan or proposal relating to or that would result in: (a) the acquisition by any person of additional securities of the Issuer or the disposition of securities of the Issuer; (b) an extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Issuer or any of its subsidiaries; (c) a sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries; (d) any change in the present board of directors or management of the Issuer, including any plans or proposals to change the number or terms of directors or to fill any existing vacancies on the board; (e) any material change in the present capitalization or dividend policy of the Issuer; (f) any other material change in the Issuers business or corporate structure; (g) any changes in the Issuers charter, by-laws or instruments corresponding thereto or other actions which may impede the acquisition of control of the Issuer by any person; (h) causing a class of securities of the Issuer to be delisted from a national securities exchange or to cease to be authorized to be quoted in an inter-dealer quotation system of a registered national securities association; (i) a class of equity securities of the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Exchange Act; or (j) any action similar to those enumerated above.

Item 5.

Interest in Securities of the Issuer

(a) (b) The following information with respect to the ownership of the Common Stock of the Issuer by the Filing Persons is provided as of July 28, 2020:


Reporting Person	Shares Held Directly		Sole Voting Power		Shared Voting Power		Sole Dispositive Power		Shared Dispositive Power		Beneficial Ownership		Percentage of Class (1)
BV 2014		2,083,887		2,083,887		0		2,083,887		0		2,083,887		6.2	%
BV 2014(B)		138,985		138,985		0		138,985		0		138,985		0.4	%
AM BV 2014 LLC		71,727		71,727		0		71,727		0		71,727		0.2	%
BV 2018		1,316,139		1,316,139		0		1,316,139		0		1,316,139		3.9	%
BV 2018(B)		69,951		69,951		0		69,951		0		69,951		0.2	%
AM BV 2018 LLC		25,974		25,974		0		25,974		0		25,974		0.1	%
UBS Oncology		2,355,557		2,355,557		0		2,355,557		0		2,355,557		7.1	%
BV 2014 GP(2)		0		0		2,222,872		0		2,222,872		2,222,872		6.7	%
BV 2014 LLC(3)		0		0		2,294,599		0		2,294,599		2,294,599		6.9	%
BV 2018 GP(4)		0		0		1,386,090		0		1,386,090		1,386,090		4.2	%
BV 2018 LLC(5)		0		0		1,412,064		0		1,412,064		1,412,064		4.2	%
Oncology Cayman(6)		0		0		2,355,557		0		2,355,557		2,355,557		7.1	%
Oncology LP(6)		0		0		2,355,557		0		2,355,557		2,355,557		7.1	%
Oncology GP(6)		0		0		2,355,557		0		2,355,557		2,355,557		7.1	%
Ansbert Gadicke(7)		0		0		6,062,220		0		6,062,220		6,062,220		18.1	%
Luke Evnin(8)		0		0		3,706,663		0		3,706,663		3,706,663		11.1	%
Todd Foley(8)		0		0		3,706,663		0		3,706,663		3,706,663		11.1	%
Edward Hurwitz(9)		0		0		1,412,064		0		1,412,064		1,412,064		4.2	%

Page 21

(1)

(2)	Includes securities held by BV 2014 and BV 2014(B). BV 2014 GP is the direct general partner of BV 2014 and BV 2014(B).

(3)	Includes securities held by BV 2014, BV2014(B) and AM BV 2014 LLC. BV 2014 LLC is the indirect general partner of BV 2014 and BV 2014(B) and the manager of AM BV 2014 LLC.

(4)	Includes securities held by BV 2018 and BV 2018(B). BV 2018 GP is the direct general partner of BV 2018 and BV 2018(B).

(5)	Includes securities held by BV 2018, BV 2018(B) and AM BV 2018 LLC. BV 2018 LLC is the indirect general partner of BV 2018 and BV 2018(B) and the manager of AM BV 2018 LLC.

(6)	Includes shares held by UBS Oncology. Oncology GP is the general partner of Oncology LP, the General Partner of Oncology (Cayman), the General Partner of UBS Oncology.

(7)	Includes securities held by BV 2014, BV 2014(B), AM BV 2014 LLC, BV 2018, BV 2018(B), AM BV 2018 LLC and UBS Oncology. The Reporting Person is a managing director of BV 2014 LLC and BV 2018 LLC and the managing director of Oncology GP.

(8)	Includes securities held by BV 2014, BV 2014(B), AM BV 2014 LLC, BV 2018, BV 2018(B), and AM BV 2018 LLC. The Reporting Person is a managing director of BV 2014 LLC and BV 2018 LLC..

(9)	Includes 1,316,139 shares held by BV 2018, 69,951 shares held by BV 2018(B) and 25,974 shares held by AM BV 2018 LLC. The Reporting Person is a managing director of BV 2018 LLC.

Each Filing Person disclaims membership in a group. Each Filing Person also disclaims beneficial ownership of any shares of the Issuer, except for the shares set forth in the table above next to the respective Filing Persons name in subsection (b) of this Item 5.

(c) The information provided in Item 3 is hereby incorporated by reference. On June 30, 2020, the MPM Entities acquired an aggregate of 10,89,922 shares of Series B Preferred Stock and 109,569 shares of Series B-1 Preferred stock upon the issuance of dividends. On July 28, 2020, the MPM Entities acquired an aggregate of 5,742,220 Common Stock of the Issuer upon the automatic conversion of preferred stock of the Issuer in connection with the closing of the Issuers initial public offering. Except as otherwise set forth herein, the Filing Persons have not acquired or disposed of any securities of the Issuer in the past 60 days.

(d) No other person is known by the Reporting Persons to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Shares beneficially owned by the Reporting Persons.

(e) Inapplicable.

Page 22

Item 6.

Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

Stockholders Agreement

The MPM Entities and other stockholders of the Issuer have entered into an Amended and Restated Stockholders Agreement dated March 24, 2020 (the Stockholders Agreement) with the Issuer. Subject to the terms of the Stockholders Agreement, holders of shares having registration rights (Registrable Securities) can demand that the Issuer file a registration statement or request that their shares be covered by a registration statement that the Issuer is otherwise filing.

Demand Registration Rights

If, at any time after 180 days after effective date, the Issuer shall receive a written request from the Holders (as defined in the Stockholders Agreement) of at least sixty percent (60%) of the shares of common stock issued upon conversion of the Issuers Senior Preferred Stock (as defined in the Stockholders Agreement) (the Initiating Holders) that the Issuer file a Form S-1 registration statement under the Securities Act of 1933 (the Securities Act) with respect to Registrable Securities owned by such Holder or Holders with respect to at least 40% of the Registrable Securities) or a lesser percentage if the having an aggregate offering price, net of Selling Expenses (as defined in the Stockholders Agreement), of at least $10 million, then the Issuer shall (i) within ten (10) business days after the date such request is given, give notice thereof (the Demand Notice) to all Holders other than the Initiating Holders; and (ii) as soon as practicable, and in any event within sixty (60) days after the date such request is given by the Initiating Holders, file a Form S-1 registration statement under the Securities Act covering all Registrable Securities that the Initiating Holders requested to be registered and any additional Registrable Securities requested to be included in such registration by any other Holders.

The Issuer shall not be obligated to effect, or to take any action to effect, any demand registration after the Issuer has effected two Form S-1 demand registrations.

Form S-3 Demand Registration Rights

If at any time when it is eligible to use a Form S-3 registration statement, the Issuer receives a request from at Holders of at least ten percent (10%) of the Registrable Securities then outstanding that the Issuer file a Form S-3 registration statement with respect to outstanding Registrable Securities of such Holders having an anticipated aggregate offering price of at least $5 million, then the Issuer shall (i) within ten (10) business days after the date such request is given, give a Demand Notice to all Holders other than the Initiating Holders; and (ii) as soon as practicable, and in any event within forty-five (45) days after the date such request is given by the Initiating Holders, file a Form S-3 registration statement under the Securities Act covering all Registrable Securities requested to be included in such registration by any other Holders.

The Issuer shall not be obligated to effect, or to take any action to effect, any Form S-3 demand registration if the Issuer has effected two Form S-3 demand registrations within the twelve month period immediately preceding the date of such request.

Piggyback Registration Rights

If the Issuer proposes to register any of its stock in connection with the public offering of such securities by the Issuer or on behalf of selling stockholders, the Issuer shall, at such time, promptly and in any event, within three business days of such determination, give each Holder written notice of such registration. Upon the written request of each Holder given within twenty (20) days after such notice is given to the Issuer, the Issuer shall, subject to the certain limitations, use its reasonable best efforts to cause to be registered all of the Registrable Securities that each such Holder has requested to be registered.

Expenses of Registration

Subject to certain limitations, the Issuer will pay all registration expenses, including the fees of one special counsel of the Holder of Registrable Securities in an amount not to exceed $50,000, other than underwriting discounts and commissions, related to any registration effected pursuant to the Stockholders Agreement.

Page 23

Indemnification

The Stockholders Agreement contains customary cross-indemnification provisions, pursuant to which the Issuer is obligated to indemnify the selling stockholders in the event of material misstatements or omissions in the registration statement attributable to the Issuer, and the selling stockholders are obligated to indemnify the Issuer for material misstatements or omissions attributable to them.

Termination

No Holder shall be entitled to exercise any registration rights on the date which is the earlier of (i) the closing of a Deemed Liquidation Event, as such term is defined in the Issuers Certificate of Incorporation; (ii) such time after the consummation of the IPO as Rule 144 or another similar exemption under the Securities Act is available for the sale of all such Holders shares without limitation during a three-month period without registration; or (iii) the fifth anniversary of a Qualified Public Offering, as such term is defined in the Issuers Certificate of Incorporation.

Lock-up Agreements

The MPM Entities and Mr. Gadicke, along with all of the Issuers officers, directors, and holders of substantially all of the Issuers Common Stock, have entered into letter agreements (the Lock-up Agreements), whereby they have agreed, subject to certain exceptions, not to offer, sell, contract to sell, pledge or otherwise dispose of or hedge any of its Common Stock or securities convertible into or exchangeable for Common Stock for a 180-day period beginning on July 23, 2020 and ending on January 19, 2021 except with the prior written consent of J.P. Morgan Securities LLC, SVB Leerink LLC and Piper Sandler & Co. on behalf of the underwriters.

The foregoing description of the terms of the Stockholders Agreement and the Lock-up Agreement is intended as a summary only and is qualified in its entirety by reference to the Stockholders Agreement and Form of Lock-up Agreement, which are filed as exhibits to this Schedule 13D and incorporated by reference herein.

Other than as described in this Schedule 13D, to the best of the Filing Persons knowledge, there are no other contracts, arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 and between such persons and any person with respect to any securities of the Issuer.

Item 7.

Material to Be Filed as Exhibits

Amended and Restated Stockholders Agreement by and among the Issuer and each of the investors listed on Exhibit A thereto, dated as of March 24, 2020 (incorporated by reference to Exhibit 4.1 to the Issuers Registration Statement on Form S-1 (SEC File No. 333-239415), filed with the SEC on June 24, 2020).

B.	Form of Lock-up Agreement (incorporated by reference to Exhibit A to Exhibit 1.1 to the Issuers Registration Statement on Form S-1/A (SEC File No. 333-239415), filed with the SEC on July 20, 2020).

C.	Agreement regarding filing of joint Schedule 13D.

Page 24

Signatures

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: August 7, 2020


MPM BIOVENTURES 2014, L.P.

By:		MPM BioVentures 2014 GP LLC,
		its General Partner
By:		MPM BioVentures 2014 LLC,
		Its Managing Member

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

MPM BIOVENTURES 2014 (B), L.P.

By:		MPM BioVentures 2014 GP LLC,
		its General Partner
By:		MPM BioVentures 2014 LLC,
		Its Managing Member

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

MPM ASSET MANAGEMENT INVESTORS BV 2014 LLC

By:		MPM BioVentures 2014 LLC,
		Its Manager

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

MPM BIOVENTURES 2014 GP, LLC

By:		MPM BioVentures 2014 LLC,
		Its Managing Member

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

Page 25


MPM BIOVENTURES 2014 LLC

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

MPM BIOVENTURES 2018, L.P.

By:		MPM BioVentures 2018 GP LLC,
		its General Partner
By:		MPM BioVentures 2018 LLC,
		Its Managing Member

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

MPM BIOVENTURES 2018 (B), L.P.

By:		MPM BioVentures 2018 GP LLC,
		its General Partner
By:		MPM BioVentures 2018 LLC,
		Its Managing Member

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

MPM ASSET MANAGEMENT INVESTORS BV 2018 LLC

By:		MPM BioVentures 2018 LLC,
		Its Manager

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

MPM BIOVENTURES 2018 GP, LLC

By:		MPM BioVentures 2018 LLC,
		Its Managing Member

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

MPM BIOVENTURES 2018 LLC

By:		/s/ Luke Evnin
Name:		Luke Evnin
Title:		Managing Director

Page 26


UBS ONCOLOGY IMPACT FUND , L.P.

By:		Oncology Impact Fund (Cayman) Management L.P.,
		its General Partner
By:		MPM Oncology Impact Management LP,
		Its General Partner
By:		MPM Oncology Impact Management GP LLC
		Its General Partner

By:		/s/ Ansbert Gadicke
Name:		Ansbert Gadicke
Title:		Managing Director

ONCOLOGY IMPACT FUND (CAYMAN) MANAGEMENT L.P.

By:		MPM Oncology Impact Management LP,
		Its General Partner
By:		MPM Oncology Impact Management GP LLC
		Its General Partner

By:		/s/ Ansbert Gadicke
Name:		Ansbert Gadicke
Title:		Managing Director

MPM ONCOLOGY IMPACT MANAGEMENT LP

By:		MPM Oncology Impact Management GP LLC
Its		General Partner

By:		/s/ Ansbert Gadicke
Name:		Ansbert Gadicke
Title:		Managing Director

MPM ONCOLOGY IMPACT MANAGEMENT GP LLC

By:		/s/ Ansbert Gadicke
Name:		Ansbert Gadicke
Title:		Managing Director

By:		/s/ Todd Foley
Name:		Todd Foley

By:		/s/ Luke Evnin
Name:		Luke Evnin

By:		/s/ Ansbert Gadicke
Name:		Ansbert Gadicke

By:		/s/ Edward Hurwitz
Name:		Edward Hurwitz

Page 27

Schedule I

General Partners/Members

Ansbert Gadicke

c/o MPM Asset Management

450 Kendall Street

Cambridge, MA 02142

Principal Occupation: Managing director of MPM BioVentures 2014 LLC, MPM BioVentures 2018 LLC and managing director of MPM Oncology Impact Management LP.

Citizenship: USA

Luke Evnin

c/o MPM Asset Management

450 Kendall Street

Cambridge, MA 02142

Principal Occupation: Managing director of MPM BioVentures 2014 LLC and MPM BioVentures 2018 LLC.

Citizenship: USA

Todd Foley

c/o MPM Asset Management

450 Kendall Street

Cambridge, MA 02142

Principal Occupation: Managing director of MPM BioVentures 2014 LLC and MPM BioVentures 2018 LLC.

Citizenship: USA

Edward Hurwitz

c/o MPM Asset Management

450 Kendall Street

Cambridge, MA 02142

Principal Occupation: Managing director of MPM BioVentures 2018 LLC.

Citizenship: USA

Page 28

Exhibit Index

B.	Form of Lock-up Agreement (incorporated by reference to Exhibit A to Exhibit 1.1 to the Issuers Registration Statement on Form S-1/A (SEC File No. 333-239415), filed with the SEC on July 20, 2020).

C.	Agreement regarding filing of joint Schedule 13D.

Page 29