MaxCyte, Inc.

("MaxCyte" or the "Company")

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ROCKVILLE, MD, July 2, 2024: MaxCyte Inc., (Nasdaq: MXCT; LSE: MXCT), a leading, cell-engineering focused company providing enabling platform technologies to advance the discovery, development and commercialization of next-generation cell-based therapeutics and innovative bioprocessing applications, announces that pursuant to its block admission facility, since 31 May it has issued 102,044 of common stock, $0.01 par, of the Company ("Common Stock") in satisfaction of the exercise of share options and/or vesting of restricted stock units.

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As at 30 June 2024, the total issued stock capital of the Company following the recent issue of the new Common Stock is 104,824,124 shares of Common Stock. Shareholders in the Company may use this figure as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the stock capital of the Company.

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About MaxCyte

At MaxCyte, we pursue cell engineering excellence to maximize the potential of cells to improve patients' lives. We have spent more than 20 years honing our expertise by building best-in-class platforms, perfecting the art of the transfection workflow, and venturing beyond today's processes to innovate tomorrow's solutions. Our ExPERT™ platform, which is based on our Flow Electroporation® technology, has been designed to support the rapidly expanding cell therapy market and can be utilized across the continuum of the high-growth cell therapy sector, from discovery and development through commercialization of next-generation, cell-based medicines. The ExPERT family of products includes: four instruments, the ATx™, STx™, GTx™ and VLx ™; a portfolio of proprietary related processing assemblies or disposables; and software protocols, all supported by a robust worldwide intellectual property portfolio. By providing our partners with the right technology platform, as well as scientific, technical and regulatory support, we aim to guide them on their journey to transform human health. Learn more at maxcyte.com and follow us on X (formerly Twitter) and LinkedIn.