Pharma BD Deal Intelligence

Sanofi SA / Protein Sciences Corp.

2017 · Acquisition/Merger · $650M · Complete

Sanofi's $650M acquisition of Protein Sciences bolstered its vaccines pipeline with recombinant flu manufacturing capacity, a modest bolt-on that scored well on strategic fit though the deal carried no disclosed upfront/milestone split and left long-term commercial impact unclear.

CALLED IT — OFF BY 16
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The coverage arc

Jul 11, 2017 GlobeNewsWire Bullish

Sanofi to acquire Protein Sciences maker of Flublok recombinant influenza vaccine for $650 million upfront plus $100 million in milestones

Aug 28, 2017 BioSpace Bullish

Sanofi completes the acquisition of Protein Sciences Corporation and its Flublok recombinant protein-based influenza vaccine platform

Feb 10, 2026 Pharmaceutical Technology Bullish

Sanofi acquires Protein Sciences gaining FDA-approved Flublok quadrivalent recombinant influenza vaccine and BEST manufacturing platform

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Sanofi acquired Protein Sciences for $650M + $100M milestones for vaccines biotech.

Key facts

Disease & market context

Influenza (Recombinant Vaccine)

$5.0B Global Influenza Vaccine Market (2017) · ~170M US Flu Vaccine Doses/Year

Disease Overview

Protein Sciences developed Flublok, the only recombinant influenza vaccine using insect cell technology instead of eggs. This eliminated egg-dependent manufacturing constraints.

Strategic Rationale

Sanofi Pasteur, the world's largest flu vaccine maker, acquired Protein Sciences to add recombinant manufacturing. The platform proved valuable for pandemic preparedness.

Deal timeline

Related deals — scored

DealYearValueOutcome
Sanofi SA / Protein Sciences Corp. (this deal)2017$650M72
Sanofi SA / Regeneron Pharmaceuticals, Inc.2007$1.0B97
Sanofi SA / Synthelabo S.A.1998$11.0B84
Sanofi SA / Genzyme Corporation2011$20.1B84
Sanofi SA / Amunix Pharmaceuticals Inc.2021$1.2B76
Sanofi SA / Genzyme Corporation2010$18.5B75
Sanofi SA / Translate Bio Inc.2018$805M73

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