X4 Pharmaceuticals Soars 13.57% on $240M Volume Ranks 486th in Market Activity as $85M Private Placement Bolsters Mavorixafor Development

X4 Pharmaceuticals (XFOR) surged 13.57% on August 13, 2025, with a trading volume of $240 million, ranking 486th in market activity. The biotech firm closed an upsized $85 million private placement, expanding from an initial $60 million target to accommodate an investor with pre-existing rights. The deal included 11.04 million shares and warrants for an additional 48.85 million shares, led by Coastlands Capital and supported by existing investors such as Empery Asset Management and Bain Capital Life Sciences. Proceeds will fund the development of mavorixafor for chronic neutropenia and commercialization efforts for WHIM syndrome.

The financing highlights investor confidence in X4’s pipeline, particularly its lead drug mavorixafor, which is already marketed in the U.S. under XOLREMDI for WHIM syndrome. The capital infusion aims to accelerate a global Phase 3 trial for chronic neutropenia and broaden the therapy’s market potential. By securing non-dilutive funding, X4 strengthens its operational runway, reducing reliance on revenue from a limited patient base and allowing flexibility in strategic initiatives. The transaction, however, remains exempt from public offering regulations, requiring a future SEC registration for resale of the shares.

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