Lewis Hamilton will leave Mercedes and join Ferrari for the 2025 Formula 1 season.
Hamilton's current contract with Mercedes was due to expire at the end of 2025 but he will depart the team after this season and replace Carlos Sainz at Ferrari.
The British driver activated a release clause in his Mercedes contract, and Ferrari confirmed on Thursday evening that the seven-time world champion is joining them on a "multi-year" deal.
Mercedes employees in Brackley were informed of the news earlier on Thursday afternoon before the official announcement from the team.
Charles Leclerc signed a new contract with Ferrari last week and will be Hamilton's team-mate at Ferrari from next year.
- 'Time is right' - Hamilton activates Merc release clause to join Ferrari
- F1 contracts: The drivers entering final year of deals
- F1 2024 car launches: When are the new challengers revealed?
- Stream every F1 race and more with NOW | Get Sky Sports
The seven-time world champion is the most successful driver in F1 history with 103 wins and 104 pole positions. Michael Schumacher is the only other driver with seven world titles.
Hamilton, who has not won a race since December 2021, joined Mercedes in 2013 from McLaren and has won six world titles with the team.
He was linked to Ferrari for this year but signed a new two-year contract last summer, along with Mercedes team-mate George Russell, to stay until the end of 2025.
The new 2024 F1 season begins with the Bahrain Grand Prix from February 29 to March 2 - live on Sky Sports F1.
One of F1's biggest-ever moves
Sky Sports News' Craig Slater:
"It's so hard to finish a sporting career. Lionel Messi has maybe had the World Cup to top it off with, but how difficult is it to exit the stage when you've had this glittering career at the top?
"What does Lewis Hamilton do to top off this masterpiece? Certainly a couple of years in red, following in the footsteps of Michael Schumacher, could he win the eighth world title? Schumacher won five of his seven with Ferrari - that would really top it off."
"Hamilton's 39 years old now. This is maybe his last opportunity to drive for Ferrari. He has previously talked about being happy to finish his career at Mercedes, with whom he has achieved so much.
"He says his idol Ayrton Senna never drove for Ferrari, and therefore you can have an iconic career without driving for them.
"Is it a gamble in pure racing terms? He's had two winless years and has seen Red Bull sweep all before them.
"In 2025, he will be at Ferrari, who have been nip and tuck with Mercedes over this previous period - but a good distance behind Red Bull."
Hamilton's past links to Ferrari
Hamilton has been linked to Ferrari several times since his F1 career started in 2007 with McLaren.
He won his first world championship with McLaren in 2008 but left at the end of 2012 to join Mercedes, where he has formed the most successful team-driver partnership in F1 history with 82 victories.
However, since the controversial 2021 Abu Dhabi Grand Prix, Hamilton has rarely fought at the front of the pack as Red Bull got on top of the new 2022 regulations and Mercedes fell behind.
He failed to win and take pole position for the first time in 2022 and continued his winless streak in 2023.
The 39-year-old most recently held talks with Ferrari last year, after previous links during his time at Mercedes, but team principal Frederic Vasseur claimed the Italian outfit never offered him a contract.
Hamilton told ESPN in May 2023: "I'd be lying if I said I'd never thought about ending my career anywhere else. I started at McLaren, I'd like to think I'll always be a part of the McLaren family, I started there when I was 13 years old, so I thought about what it would look like if I was at McLaren one day.
"I thought about and watched the Ferrari drivers on the screens at the track and of course you wonder what it would be like to be in red... But then I go to my team, to Mercedes, and this is my home. I'm happy where I am. I haven't signed a contract yet, but we are working on one."
Leclerc has been at Ferrari since 2019 and Hamilton will be his third team-mate at Scuderia, having partnered Sebastian Vettel for two seasons and Sainz since 2021.
Asked last year if he would welcome Hamilton as a team-mate, he said: "If I say yes, I imagine it being the title of every newspaper. But I mean, Lewis is such an incredible driver, has achieved so much in the sport.
"So, I think anybody on the grid will love to have Lewis as a team-mate, as everybody will learn a lot from him. But yeah, again, I'm happy where I am. And with Carlos, it's a great relationship too."
Reaction to Hamilton's shock move
Who will replace Hamilton?
Hamilton's surprise announcement leaves Mercedes in a tricky position as they are losing a driver seen as one of the greatest of all time.
Sainz, who was the only non-Red Bull race winner last year, also loses out and is now without a drive for 2025.
"What I think is worth mentioning here is this explains why McLaren signed up Lando Norris to a longer-term deal a couple of weeks ago and why Ferrari signed up Leclerc as well," added Slater.
"Ferrari, as soon as they knew they were getting Hamilton - and I understand this courtship has been going on for several months, it's not a new thing... - the other teams have been aware their prize assets might be a target for Mercedes.
"It's hard to see who Mercedes promote - probably good news for George Russell, he'll become No 1 within the team.
"Frederik Vesti is their junior driver, he's not ready for Formula 1. They've got Mick Schumacher as their reserve driver, who didn't have a great start to his F1 career - might he be a stop-gap? Alex Albon, to me, might be the heavyweight signing to replace Hamilton."
24 races in 2024! Watch every round of next season live on Sky Sports F1, starting with the Bahrain Grand Prix from February 29-March 2. Stream every F1 race and more with a NOW Sports Month Membership
Get Sky Sports on WhatsApp!
You can now start receiving messages and alerts for the latest breaking sports news, analysis, in-depth features and videos from our dedicated WhatsApp channel!