# EDGAR Filing Document

**Accession Number:** 0001293971
**File Stem:** 9999999995-25-001812
**Filing Date:** 2025-6
**Character Count:** 1431
**Document Hash:** 5c2e560108b58e8d6acacddf6a80508f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-25-001812.hdr.sgml**: 20250604

**ACCESSION NUMBER**: 9999999995-25-001812

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250603

**DATE AS OF CHANGE**: 20250604

**EFFECTIVENESS DATE**: 20250603

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** bluebird bio, Inc.
- **CENTRAL INDEX KEY:** 0001293971
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-271772
- **FILM NUMBER:** 251021805

**BUSINESS ADDRESS:**
- **STREET 1:** 455 GRAND UNION BOULEVARD
- **CITY:** SOMERVILLE
- **STATE:** MA
- **ZIP:** 02145
- **BUSINESS PHONE:** 339-499-9300

**MAIL ADDRESS:**
- **STREET 1:** 455 GRAND UNION BOULEVARD
- **CITY:** SOMERVILLE
- **STATE:** MA
- **ZIP:** 02145

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Genetix Pharmaceuticals Inc
- **DATE OF NAME CHANGE:** 20040616

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

## Notice of Effectiveness

**Date:** June 3, 2025

**Accession Number:** 0001193125-25-132963

**Form Type:** POS AM

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**CIK:** 0001293971

**Company Name:** bluebird bio, Inc.

**File Number:** 333-271772