The private equity firm Advent International is spearheading a multibillion-euro takeover bid for InPost, the owner of British parcel delivery firm Yodel.
Sky News has learnt that Advent, which is a minority investor in InPost after taking it public in Amsterdam in 2021, is part of a consortium looking to acquire the company.
Banking sources speculated on Tuesday that other major shareholders in InPost might also be involved in the consortium.
Any offer would be likely to value the company at in excess of €6bn (£5.2bn).
Headquartered in Poland, InPost is among the world's biggest delivery and e-commerce logistics companies.
In its most recent fiscal quarter, it delivered more than 350 million parcels across the markets in which it operates, including Britain.
In a statement to the Euronext Amsterdam exchange on Tuesday, InPost said: "In view of the recent share price and trading volume development, InPost S.A. announces that it has received an indicative proposal regarding a potential acquisition of all shares in the company.
"A special committee has been formed of supervisory and management board members of the company that will carefully consider all aspects of a potential transaction, ensuring that the interests of the company and all of its stakeholders are taken into account in the decision-making with respect to a potential transaction.
"At this time, there can be no assurance that this will lead to a transaction."
Shares in InPost were up about 20% on the back of the statement, giving the company a market capitalisation of €5.8bn.
Even with that surge, its stock has fallen by close to a fifth over the last year.
Advent originally invested in InPost in 2017, later selling part of its stake to PPF, a Czech investment firm.
Analysts speculated that PPF was also likely to be involved in any formal takeover bid.
Advent and InPost declined to comment.