It suggests 1,600 lobbyists are in Belém, a 12% rise from the COP meeting last year.
It is common for business leaders to come to the talks to strike deals.
With the US strikingly absent from negotiations, progress has been slow. It is the first time the country has sent no delegation to the talks, after President Donald Trump branded climate change “a con”.
Earlier in the week a group of senior climate leaders wrote a letter calling on the summit to ensure the facts about climate change were “upheld.
Ten countries have signed an initiative called Declaration on Information Integrity on Climate Change at COP30, launched by the Global Initiative for Information Integrity on Climate Change.
It aims to create international commitments to address climate disinformation and promote evidence-based information on climate issues.
On the core issues of how to tackle the root cause of climate change and how to help countries adapt to ongoing global warming, Brazil has promised the talks will deliver action to implement years of deals and pledges.
The talks continue into next week.