# EDGAR Filing Document

**Accession Number:** 0001485003
**File Stem:** 9999999997-23-000292
**Filing Date:** 2023-1
**Character Count:** 1828
**Document Hash:** 989c247bc7c01bf1e52ddc2be8d8a70b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999997-23-000292.hdr.sgml**: 20230303

**ACCESSION NUMBER**: 9999999997-23-000292

**CONFORMED SUBMISSION TYPE**: SEC STAFF LETTER

**CATEGORY**: REDACTED EXHIBIT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230120

**ACTION DATE**: 20230120

**RECEIVED DATE**: 20230124

**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:** SEC STAFF LETTER

**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

### Attached PDF Documents

**Attachment 1:** `filename1`

DIVISION OF
CORPORATION FINANCE

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

January 20, 2023

Thomas R. Cannell, D.V.M.
President and Chief Executive Officer
Sesen Bio, Inc.
245 First Street, Suite 1800
Cambridge, MA 02142

Re: Sesen Bio, Inc.
Amendment No 4 to Registration Statement on Form S-4
Exhibit Nos. 10.10-10.11, 10.29-10.30, 10.32-10.34
Filed January 18, 2023
File No. 333-267891

Dear Thomas R. Cannell, D.V.M:

We have concluded our assessment of your redacted exhibits for compliance with applicable form requirements and will process your supplemental response and related materials in accordance with your request.

Sincerely,
Division of Corporation Finance