# EDGAR Filing Document

**Accession Number:** 0001382031
**File Stem:** 0000899243-23-000997
**Filing Date:** 2023-1
**Character Count:** 8472
**Document Hash:** 95668a6148958e4aeab572f34c7b87bf
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000899243-23-000997.hdr.sgml**: 20230105

**ACCESSION NUMBER**: 0000899243-23-000997

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20230104

**FILED AS OF DATE**: 20230105

**DATE AS OF CHANGE**: 20230105

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Fraser Claire
- **CENTRAL INDEX KEY:** 0001382031

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-37465
- **FILM NUMBER:** 23511742

**MAIL ADDRESS:**
- **STREET 1:** C/O BECTON, DICKINSON AND COMPANY
- **CITY:** FRANKLIN LAKES
- **STATE:** NJ
- **ZIP:** 07465

**FORMER NAME:**
- **FORMER CONFORMED NAME:** Fraser-Liggett Claire
- **DATE OF NAME CHANGE:** 20061122
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Seres Therapeutics, Inc.
- **CENTRAL INDEX KEY:** 0001609809
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **IRS NUMBER:** 274326290
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 200 SIDNEY STREET
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02139
- **BUSINESS PHONE:** 617 945 9626

**MAIL ADDRESS:**
- **STREET 1:** 200 SIDNEY STREET
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02139

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Seres Health, Inc.
- **DATE OF NAME CHANGE:** 20140603

## Ex-24

```
<PRE>
                               POWER OF ATTORNEY

        KNOW ALL BY THESE PRESENTS, as of this 4th day of January, 2023, that
the undersigned hereby constitutes and appoints the Chief Executive Officer of
Seres Therapeutics, Inc. (the "Company"), who is currently Eric D. Shaff, and
the Chief Legal Officer of the Company who is currently Thomas J. DesRosier, or
any or each of them signing singly, and with full power of substitution, the
undersigned's true and lawful attorney-in-fact to:

       (1)  prepare, execute in the undersigned's name and on the undersigned's
            behalf, and submit to the U.S. Securities and Exchange Commission
            (the "SEC") a Form ID, including amendments thereto, and any other
            documents necessary or appropriate to obtain codes and passwords
            enabling the undersigned to make electronic filings with the SEC of
            reports required by Section 16(a) of the Securities Exchange Act of
            1934 (the "Exchange Act") or any rule or regulation of the SEC;

       (2)  execute for and on behalf of the undersigned, in the undersigned's
            capacity as an officer and/or director of the Company, Forms 3, 4,
            and 5 in accordance with Section 16(a) of the Exchange Act and the
            rules thereunder;

       (3)  do and perform any and all acts for and on behalf of the undersigned
            which may be necessary or desirable to complete and execute any such
            Form 3, 4, or 5, complete and execute any amendment or amendments
            thereto, and timely file such form with the SEC and any stock
            exchange or similar authority; and

       (4)  take any other action of any type whatsoever in connection with the
            foregoing which, in the opinion of such attorney-in-fact, may be of
            benefit to, in the best interest of, or legally required by, the
            undersigned, it being understood that the documents executed by such
            attorney-in-fact on behalf of the undersigned pursuant to this Power
            of Attorney shall be in such form and shall contain such terms and
            conditions as such attorney-in-fact may approve in such attorney-
            in-fact's discretion.

       The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution and/or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in- fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Exchange Act.

       This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

       IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of the date first written above.

                                                /s/ Claire Fraser
                                                --------------------------------
                                                                       Signature

                                                Claire Fraser
                                                --------------------------------
                                                                    Printed Name

</PRE>
```

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Fraser Claire<br><sub>(Last) (First) (Middle)</sub><br>C/O SERES THERAPEUTICS, INC.<br>200 SIDNEY STREET<br><sub>(Street)</sub><br>CAMBRIDGE, MA 02139<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Seres Therapeutics, Inc. [ MCRB ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2023-01-04 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |

---

**Remarks:**
Exhibit List: Exhibit 24 - Power of Attorney

**Signature:** /s/ Thomas J. DesRosier, Attorney-in-fact for Claire Fraser  
**Date:** 2023-01-05

### Remarks:

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 Number.**