EasyJet’s board has pushed back against the prospect of a takeover by American investment firm Castlelake, branding the approach as “opportunistic” and confirming that no discussions have taken place. The British low-cost carrier, which holds a significant share of the European short-haul market, said its share price is temporarily depressed by geopolitical instability in the Middle East and volatile fuel costs, implying that any bid at current levels would undervalue the company.

Castlelake, which disclosed a 2.14 per cent stake held on behalf of managed funds, set out early-stage considerations over the weekend, indicating that any offer would be for no less than 403.23 pence a share. That floor would value easyJet at around £3.06 billion. Viewed from Washington, the move reflects a confident American private capital sector seeking to capitalise on depressed European aviation assets, but the reaction in the City of London was swift: easyJet shares jumped more than 10 per cent in early trading, hitting their highest level since March.

The timing is pivotal. EasyJet’s management contends the share price has been unfairly punished by the Middle East conflict and its knock-on effect on consumer sentiment and jet fuel prices. Yet Castlelake has not yet made a formal approach, and under UK takeover rules it must declare a firm intention to bid by 5pm on 26 June or walk away for six months. Both sides are manoeuvring in the shadow of a regulatory thicket that could yet frustrate any deal.

Analysts in continental Europe point to EU airline ownership rules, which require that carriers holding operating licences within the bloc be majority-owned by EU nationals. That condition would require a complex restructuring for a US-controlled entity to take over a British airline with a major EU presence. While London is no longer bound by the same EU rules post-Brexit, easyJet’s network depends heavily on an Austrian air operator certificate and EU traffic rights, meaning Brussels retains leverage. Whether Castlelake can disentangle these regulatory threads — and whether easyJet’s board will engage — remains the central question as the deadline approaches.