The fees total more than Prosus' free cashflow for the year ended 31 March, and are almost three times more than Naspers paid in 2019 to list Prosus on the Amsterdam Stock Exchange.
Some R1.6bn of the fees will be to cover securities transfer tax (STT), according to the document, reviewed by Reuters. The rest will be for costs such as fees for bankers, lawyers and accountants.
Prosus was spun out of Naspers in 2019 to hold the South African group's international assets, including its 29% stake in Chinese tech giant Tencent. Naspers hoped the move would reduce the discount its shares traded at to the value of its holding in Tencent.
However, the discount kept widening.
To try to address this, Prosus said in May it would issue new shares to buy up to 45.4% of Naspers in a share swap deal.
The deal will move more of Naspers' Tencent stake to Amsterdam from Johannesburg and, according to the two firms, help Naspers close the value gap to its Tencent stake because Prosus' stock is more highly valued than Naspers'.
The deal will also increase Prosus' free float on Euronext.
"The overall costs are less than 1% of the total value unlock that happens on day one as result of exchanging high discount Naspers shares to lower discount Prosus shares," Prosus told Reuters via email.
But some shareholders are unhappy with the costs after they had opposed the deal, saying it would create a complicated cross-holding structure that might increase the discount.
"I wouldn't want to see such huge amounts of money being paid," said Peter Takaendesa, head of equities at Mergence Investment Managers in South Africa.
"It is quite material, especially if we are comparing the two transactions," he said, referring to the fees paid during the listing of Prosus.
Mergence was among 36 fund managers from South Africa who wrote to Prosus' management in June opposing the transaction.
In a shareholder vote on 9 July, the transaction won 90% backing, because over two-thirds of Prosus is held by Naspers. But up to 47% of outside shareholders in Prosus voted against.
When Naspers listed Prosus in 2019, it paid R500,000 to financial advisers, compared with the R350,000 Prosus will pay them for the share swap, the document shows.
Prosus notes the bulk of the fees are due to tax, but some investors said that was no excuse.
"When you're doing a bad transaction, and a transaction that many shareholders have expressed a concern on, then any amount you pay is too much," said Rajay Ambekar, CEO at Excelsia Capital, a Cape Town-based asset manager with shares in Naspers.
"It is a real cost that shareholders are having to bear."
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