Basilea Pharmaceutica — BAL2420 clinical entry expands antibiotic pipeline

Basilea Pharmaceutica (SIX: BSLN)

Last close As at 26/03/2026

CHF52.50

0.80 (1.55%)

Market capitalisation

CHF700m

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Research: Healthcare

Basilea Pharmaceutica — BAL2420 clinical entry expands antibiotic pipeline

Basilea Pharmaceutica’s clinical pipeline expands further with the Phase I initiation for BAL2420, a novel antibiotic targeting Gram-negative bacterial infections such as caused by Enterobacteriaceae, including multidrug-resistant (MDR) strains such as E. coli and K. pneumoniae (50–70% of all Enterobacteriaceae isolates). BAL2420 represents a novel mechanism of action versus existing antibiotics and works by disrupting the LptA-mediated lipopolysaccharide transport bridge, an essential structural component in Gram-negative bacteria. With carbapenem-resistant Enterobacteriaceae a high-priority target for global health authorities such as the World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC), we view BAL2420’s clinical entry as materially boosting Basilea’s pipeline. BAL2420 represents the third antibiotic in Basilea’s portfolio after Zevtera and ceftibuten-ledaborbactam (CTB-LEDA), with the latter also targeting MDR Enterobacterales with focus on oral treatment of complicated urinary tract infections (cUTIs). We will present updated estimates for BAL2420’s inclusion in due course.

Jyoti Prakash

Written by

Jyoti Prakash, CFA

Director, healthcare

Healthcare

Clinical update

27 March 2026

Price CHF52.50
Market cap CHF689m

Net cash/(debt) at 31 December 2025

CHF86.9m

Shares in issue

13.3m
Code BSLN
Primary exchange SWX
Secondary exchange N/A
Price Performance

Business description

Basilea Pharmaceutica is focused on treating severe bacterial and fungal infections. Its marketed products are Cresemba (an antifungal) and Zevtera (an anti-MRSA broad-spectrum antibiotic). It also has a broad development pipeline that includes two antifungals: Phase III novel broad-spectrum treatment fosmanogepix (two Phase III trials ongoing) and Phase II asset BAL2062; and two antibacterials: LptA inhibitor BAL2420 (Phase I) and Phase III-ready oral combination treatment CTB-LEDA.

Analysts

Jyoti Prakash, CFA
+44 (0)20 3077 5700
Arron Aatkar, PhD
+44 (0)20 3077 5700

Basilea Pharmaceutica is a research client of Edison Investment Research Limited

Note: PBT and EPS are normalised, excluding amortisation of acquired intangibles, exceptional items and share-based payments.

Year end Revenue (CHFm) EBITDA (CHFm) PBT (CHFm) EPS (CHF) DPS (CHF) EV/EBITDA (x) P/E (x)
12/24 208.5 62.9 60.6 6.44 0.00 9.6 8.1
12/25 232.4 53.4 46.2 3.31 0.00 11.3 15.9

The Phase I study (first patient dosed) is a randomised, double-blind, placebo-controlled, dose-escalation trial assessing safety, tolerability and pharmacokinetics of BAL2420 via single and multiple-ascending dose cohorts. BAL2420 originates from the LptA inhibitor antibiotic programme acquired by Basilea from Spexis AG in January 2024, targeting the lipopolysaccharide transport bridge, an essential structure in gram-negative bacteria. By disrupting outer membrane integrity and inducing intracellular lipopolysaccharide accumulation, it exerts a bactericidal effect. Preclinical studies (in vitro and in vivo) have demonstrated activity against Enterobacteriaceae, including E. coli and K. pneumoniae, notably in strains resistant to beta-lactams and colistin. Preclinical development has been supported by CARB-X, with committment for $8.2m in non-dilutive funding to date (including $0.9m in April 2024 and $7.3m in December 2024 following clinical candidate nomination).

From a portfolio perspective, BAL2420 broadens Basilea’s antibiotic franchise alongside Zevtera (commercial-stage, IV, targeting methicillin-resistant Staphylococcus aureus) and CTB-LEDA (oral beta-lactam/beta-lactamase inhibitor, Phase III-ready in cUTIs). From a competitive standpoint, the gram-negative space is dominated by IV beta-lactam/beta-lactamase inhibitors and newer agents such as cefiderocol (brand name: Fetroja). However, growing antimicrobial resistance highlights continued unmet need, and noted by the WHO as high priority requring new and effective antibiotic treatments. BAL2420’s novel, first-in-class mechanism could offer a differentiated approach and meaningful commercial potential, contingent on clinical validation against existing gram-negative therapies.

While target indications for BAL2420 remain to be defined, we believe its differentiated profile and focus on critical-priority MDR pathogens position it favourably within an evolving but still underserved competitive landscape. Clinical validation will be key, but successful development could support meaningful commercial potential.

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