# EDGAR Filing Document

**Accession Number:** 0001485003
**File Stem:** 0001104659-23-004856
**Filing Date:** 2023-1
**Character Count:** 2278
**Document Hash:** 0b82ad621568c50ccd7675dad68cd7a6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-23-004856.hdr.sgml**: 20230303

**ACCESSION NUMBER**: 0001104659-23-004856

**CONFORMED SUBMISSION TYPE**: CORRESP

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20230119

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Sesen Bio, Inc.
- **CENTRAL INDEX KEY:** 0001485003
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **IRS NUMBER:** 262025616
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** CORRESP

**BUSINESS ADDRESS:**
- **STREET 1:** 245 FIRST STREET
- **STREET 2:** SUITE 1800
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02142
- **BUSINESS PHONE:** 617-444-8550

**MAIL ADDRESS:**
- **STREET 1:** 245 FIRST STREET
- **STREET 2:** SUITE 1800
- **CITY:** CAMBRIDGE
- **STATE:** MA
- **ZIP:** 02142

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Eleven Biotherapeutics, Inc.
- **DATE OF NAME CHANGE:** 20100223

![](tm2227887d18correspimg001.jpg)

January 19, 2023

***CORRESPONDENCE FILED VIA EDGAR***

Office of Life Sciences

Division of Corporation Finance

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attention: Ada D. Sarmento & Dillon Hagius

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| | |
|:---|:---|
| **Re:** | **Sesen Bio, Inc.** |

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**Registration Statement on Form S-4 (File No. 333-267891)**

**Request for Acceleration of Effective Date**

Dear Ms. Sarmento & Mr. Hagius:

Pursuant to Rule 461 of the General Rules and Regulations under the Securities Act of 1933, as amended, Sesen Bio, Inc. (the "**Company**") hereby respectfully requests that the U.S. Securities and Exchange Commission accelerate the effective date and time of the above referenced Registration Statement on Form S-4 (the "**Registration Statement**") and declare the Registration Statement effective as of 4:00 p.m. Eastern Time on January 19, 2023, or as soon thereafter as practicable.

The Company requests that it be notified of such effectiveness by a telephone call to Tiffany Posil of Hogan Lovells US LLP at (202) 637-3663.

[Signature page follows]

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| |
|:---|
| Sincerely, |
| Sesen Bio, Inc. |
| /s/ Mark R. Sullivan |
| Mark R. Sullivan |
| General Counsel, Chief Compliance Officer and Corporate Secretary |

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