Credit Suisse shares jumped over 20% today after the company secured a lifeline from the Swiss central bank to shore up investor confidence.
However some analysts said the market relief could be shortlived.
The Swiss bank's announcement that it would make use of a $54-billion loan from the Swiss National Bank helped stem heavy selling in financial markets in Asia and prompted a modest rally in European equities.
While many in the market cheered the news, others were cautious.
JPMorgan analysts said the loan from the SNB would not be enough to soothe investor concerns and the "status quo was no longer an option", leaving a takeover of Credit Suisse as the most likely outcome.
The collapse of two regional US lenders in the last week has raised concern among investors and bank customers about the resilience of the financial system in the face of rising global interest rates.
Credit Suisse shares surged by as much as 32% in the first few minutes of trade on news of the lifeline, and were last up 24% in heavy volume, reversing some of the losses that stripped off a quarter of its market value the day before.
Shares were changing hands at a rate of 33.27 million per hour, the fastest on record, according to Refinitiv data.
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The bank's shares fell 24% yesterday after its biggest backer said it could not offer any more financial assistance for regulatory reasons.
In its statement today, Credit Suisse said it would exercise an option to borrow from the central bank up to 50 billion Swiss francs ($54 billion).
That followed assurances from Swiss authorities yesterday that Credit Suisse met "the capital and liquidity requirements imposed on systemically important banks" and that it could access central bank liquidity if needed.
"Following yesterday's extreme share price volatility, Swiss authorities offered their support. This is a strong and important signal. We hope the measures will calm down markets and break the negative spiral," Bank Vontobel equity strategist Andreas Venditti said.
"However, it will take time to fully regain trust in the franchise," Venditti said.
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Analysts at JPMorgan said in a note that a takeover was the most likely scenario for Credit Suisse, especially by rival UBS.
"We see SNB liquidity support as indicated last night as not enough and believe CSG's situation is about ongoing market confidence issues with its IB strategy and ongoing franchise erosion," JPMorgan said.
"In our view, the status quo is no longer an option as counterparty concerns are starting to emerge as reflected by credit/equity market weakness," they said.
"Credit Suisse is the first major bank, deemed too big to fail, to take up the offer of an emergency lifeline," Susannah Streeter, head of money and markets at Hargreaves Lansdown, said.
"The $54 billion rescue wad is staunching worries about a bigger run on Credit Suisse and the repercussions for other institutions around the world exposed to its operations," she added.
Shares in other major European banks were mixed, with France's BNP Paribas up 0.9% while those in Societe Generale and Germany's Deutsche Bank fell 1.2% and 0.3%, respectively.
French bank shares, in particular, were hit hard yesterday, posting their largest one-day drops since the depths of the Covid crisis three years ago.
The Irish banking shares also reversed their earlier gains to stand lower this afternoon.