Dutch internet conglomerate Prosus has today made an unsolicited £4.9 billion cash bid to buy British food delivery firm Just Eat.

Prosus is using its superior financial firepower to try to scupper an all share offer from Dutch rival Takeaway.com. 

The offer is the first significant move by CEO Bob van Dijk since Prosus went public last month, creating a European tech company with a market cap of $120 billion, largely due to its 31% stake in Chinese internet and gaming giant Tencent.

Van Dijk said the all-cash offer was worth £4.9 billion, or a 20% premium to Takeaway's offer of 594 pence, based on its closing price as of yesterday. 

He said he had spoken with Just Eat's board but had not been able to reach an agreement. 

Just Eat said the Prosus bid "significantly undervalues" Just Eat and had been unanimously rejected by the board. 

"We don't believe we're going hostile. What we think is that we haven't been able to agree on a proposal, but we believe that shareholders will find this offer attractive," Van Dijk said, adding that Prosus has greater financial resources needed to invest and grow Just Eat's business. 

Just Eat said it stood by the deal it agreed with Takeaway, saying that was based on "compelling strategic rationale". 

Takeaway shares have fallen sharply since its agreed offer was announced in July, but rebounded 4.4% to €74.05 today.

Just Eat shares soared 24.3% to 733 pence, above Prosus's offer price. 

Prosus, the huge technology portfolio company, was spun-off from South Africa's Naspers last month and traded just 0.4% higher on the news.

Prosus's CEO said in a statement that as a result, it was making the announcement to give Just Eat shareholders the opportunity to consider the higher Prosus bid.