Swiss pharmaceutical giant Novartis has struck a deal to acquire Anthos Therapeutics, a biopharma company majority-owned by Blackstone’s drug development arm, for up to $3.1 billion. The acquisition is aimed at bolstering Novartis’ presence in the cardiovascular sector, a key focus for the company as its blockbuster heart failure drug Entresto faces patent expiration this year.
Founded in 2019 by Blackstone’s Life Sciences division and Novartis, Anthos was created to develop abelacimab, a promising treatment designed to prevent strokes and prevent recurring blood clots. This transaction underscores Novartis’ commitment to cardiovascular treatments, which is one of five critical therapeutic areas the company is prioritizing.
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The deal, which is expected to close by mid-2025, marks a significant step in the evolving partnership between a major pharmaceutical company and private equity, a model that has gained traction in the industry. Novartis will pay an initial $925 million, with potential additional payments up to $2.15 billion, contingent on the successful development of the therapy.
This marks the largest sale of a majority-owned company by Blackstone’s Life Sciences division to date. In December 2023, Blackstone was exploring the sale of Anthos, and the current deal brings the partnership to a close.
Abelacimab is part of a new class of anticoagulants known as factor XI inhibitors, designed to potentially replace established blood thinners like Eliquis (Bristol Myers-Squibb and Pfizer) and Xarelto (Johnson & Johnson and Bayer), both of which are billion-dollar sellers. Other major companies in the factor XI race include Bristol-Myers Squibb and Johnson & Johnson, who are advancing a similar drug candidate, as well as Merck & Co, which is progressing with a mid-stage development candidate. Bayer, meanwhile, faced a setback in 2023 with its factor XI drug.
Nicholas Galakatos, Chairman of Anthos’ board and Global Head of Blackstone Life Sciences expressed pride in the firm’s role in launching and growing Anthos, adding, “We believe abelacimab has the potential to be a leader in the new class of Factor XI anticoagulants and are pleased to have Novartis as a committed partner to advance the development and commercialization of abelacimab for millions of patients at risk of strokes.”
Anthos is currently conducting multiple Phase 3 clinical trials, with data expected in the second half of 2026. While Novartis holds a small minority equity stake in Anthos, the company has not disclosed the exact size of this investment.
