Mérieux Développement led the completion of $21 Million Series B Financing of ImaginAb

Lyon, France - June, 5^th 2014 - Mérieux Développement, the investment firm of Institut Mérieux, announced today the completion of $21M Series B financing of ImaginAb, Inc., an american clinical stage biotechnology company that engineers antibodies into smaller protein formats optimized for in vivo molecular imaging. Mérieux Développement led this $21 Million Series B Financing, which was also syndicated with Novartis Venture Funds, Cycad Group and Nextech Invest.

Dr. Christian Behrenbruch, co-founder and CEO of ImaginAb commented, "We have made excellent progress with our programs in cancer and immunology, and we are pleased to have concluded this round of growth capital to accelerate the development of IAB2M, our lead program in prostate cancer, and continue to expand our product pipeline."

"ImaginAb's prostate cancer imaging program has demonstrated impressive clinical data. We are convinced that ImaginAb's IAB2M PSMA PET imaging agent has the potential to transform the management of high-risk patients for surgical staging and biochemical recurrence," stated Valérie Calenda, Partner at Mérieux Développement. "The sensitivity and specificity of this proprietary antibody fragment approach has also the potential to change the way we understand and manage this pathology."

Dr. Abbie Celniker, Chair of the Board of ImaginAb also commented, "In addition to the Company's progress in imaging prostate cancer, ImaginAb is developing antibody-fragment based imaging of CD8+ T cells. Molecular imaging has the power to inform many cancer immunotherapy strategies around important targets such as PD-1/L1 and CTLA-4, which require innovative ways of measuring and monitoring immune response."

ImaginAb's pipeline of imaging agents for prostate, pancreatic and ovarian cancer have the potential to redefine the staging and management of diseases that currently face significant challenges in clinical practice. The Company's CD3 and CD8 "immunoPET" imaging programs deliver a clearer understanding of the role of immune function and response in a variety of disease settings, including cancer and autoimmune diseases. ImaginAb's internal product pipeline is augmented by approximately 30 collaborations with global pharmaceutical companies for a variety of cancer, immune/inflammatory and neurodegenerative disease targets.

About Mérieux Développement

Mérieux Développement is an investment firm dedicated to healthcare through venture capital and growth capital investment. Mérieux Développement is a subsidiary of Institut Mérieux with 15,000 employees globally and consolidated revenues in excess of EUR 2.0 billion (2013). Other companies within the Mérieux family holdings include bioMérieux, Mérieux NutriSciences, Transgene and Advanced BioScience Laboratories, Inc. Mérieux Développement works closely with entrepreneurs committed to delivering products and services that deliver genuine advancements to patient health and healthcare outcomes.

For more information, please visit: www.merieux-developpement.com

About ImaginAb

ImaginAb is redefining therapeutic management by harnessing the power of antibody technology for in vivo imaging. The company's proprietary antibody fragment platform yields actionable molecular information to guide treatment decisions in cancer and immunology. ImaginAb also collaborates with select biopharmaceutical partners to design imaging agents as companion diagnostics for therapeutic antibodies. ImaginAb's technology is positioned to deliver on the promise of precision medicine by improving patient outcomes and reducing the cost of healthcare.

For more information, visit www.imaginab.com

Relations Communication - Mérieux Développement

Aurélie Boulleray - [email protected] - +33 4 78 87 37 00