Climate activists have blockaded the London Stock Exchange by gluing themselves across the entrances.
Protesters from Extinction Rebellion attached themselves to walls and to each other at the financial centre in the City of London.
A group also climbed on to a Docklands Light Railway (DLR) train at Canary Wharf and held up banners.
Police warned of disruption throughout the day, as the protests come to an end.
Extinction Rebellion is urging the government to "tell the truth" about the scale of the climate crisis, it wants the UK to reduce carbon emissions to net zero by 2025 and it wants a Citizens' Assembly to oversee the changes needed to achieve that goal.
More than 1,000 people have been arrested since the protests began on 15 April.
The group had previously said it would end its action later in the day, having previously blocked sites including Parliament Square and Waterloo Bridge.
Disruption is anticipated in the City today due to Extinction Rebellion's fortnight of action. It's likely the whole of the City will experience disruption to roads and the transport network.
— City of London Police (@CityPolice) 25 апреля 2019 г.
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Extinction Rebellion said protesters would spend the day focusing on the financial industry "and the corrosive impacts of the financial sector on the world we live in".
The 13 activists blockading the stock exchange wore LED signs reading "Climate emergency", "Tell the truth" and "You can't eat money".
One protester, Adam Woodall, said they had targeted the building because "people are making millions, even billions of pounds out of trading ecological destruction".
The London Stock Exchange said markets were all open as normal in spite of the action.
Four people were standing on top of the DLR train holding signs saying "Business as usual = death" and "Don't jail the canaries". Another activist glued herself to a carriage.
Services are still running on the DLR, but Transport for London has warned there are minor delays between Bank and Stratford/Lewisham.
British Transport Police said officers had been sent to Canary Wharf to remove the protesters.
As of Wednesday evening, a total of 1,088 people had been arrested - with 69 of those charged in connection with the protest, the Met Police said.
Extinction Rebellion protesters also remain at Marble Arch, although no roads have been blocked there.
More than 10,000 officers have been deployed during the action.
Mayor of London Sadiq Khan said the protests had been a "huge challenge for our over-stretched and under-resourced Metropolitan Police".
The group has said it will hold a "closing ceremony" at Speakers' Corner in Hyde Park at 17:00 BST, but warned that the public should expect more action "very soon".