The Most Exciting Startups in London for 2025
The most thrilling startups in the UK capital highlight its prowess in biotechnology and artificial intelligence.
IN THE “START-UP, Scale-Up” review report released last year, Chancellor Rachel Reeves pledged to establish Britain as the “high-growth startup center of the globe.” Now, nearly six months into the new administration, entrepreneurs continue to feel optimistic about the commitments outlined in the Labour manifesto. “The vision represented by Great British Energy and the 2030 decarbonization goals is exactly what we require and deserve,” states Shilpika Gautam, CEO of the greentech startup Opna, regarding Labour’s energy strategies. “It is about time the UK aligned itself with the policy and funding advancements seen in other nations, like the Inflation Reduction Act in the US.”
Amit Gudka, the founder of Field, concurs: “We support Labour’s initiatives to double onshore wind, triple solar energy, and quadruple offshore wind by 2030.” These plans are ambitious yet attainable, as long as the government maintains clear policy choices and fosters a stable policy and regulatory framework. Other industries, like health care, exhibit similar cautious optimism. “Meri Beckwith, cofounder of Lindus Health, states that ‘Labour possesses a stronger political mandate to truly reform the NHS, and Wes Streeting, in particular, appears pragmatic.’” “He’s indicated a stronger readiness to collaborate with private firms to tackle several significant issues confronting the NHS.”
Naturally, expectations are moderated by the reality that remains from 14 years of Conservative rule. For example, in June, the UK government was forced to abandon a £1.3 billion ($1.7 billion) pledge for technology and AI initiatives promised by the prior administration since no funding had been designated for it. “We ought to anticipate that UK industry and academia will explore different paths to gather the resources necessary for constructing that infrastructure,” states Robin Tuluie, founder and CSEO of PhysicsX. “We do not envy the extremely difficult financial decisions that the chancellor and the Labour government must confront.”
Robin AI
Robin AI is developing an AI legal assistant designed to assist anyone in resolving their legal issues. “I aimed to enhance access to law,” states Richard Robinson, a previous corporate attorney at Boies Schiller Flexner and CEO of Robin AI. “We’re not here to inflate the billable hours revenue model of large law firms.” “We’re AI designed for business purposes, not merely for law firms.” Co-founded in 2019 by Robinson and machine learning expert James Clough, Robin’s legal assistant is currently employed by hundreds of companies, including PepsiCo, PwC, and Yum! Labels. Its newest offering, Robin AI Reports, is capable, as per Robinson, of reviewing numerous legal contracts and producing individual reports within minutes, enabling businesses to finish legal procedures that traditionally required weeks—such as M&A Due Diligence—in just a few hours. The firm secured $26 million (£19.8 million) from Temasek, based in Singapore, and has just launched an office in Singapore, complementing its locations in London and New York. robinai.com
Gaia Family
“I dare you to locate a fertility clinic website that doesn’t prominently display a baby in a blue blanket,” remarks Nader AlSalim, CEO of Gaia Family. “However, the way you reach that baby—and even more crucially if you manage to reach it at all— is considerably less clear-cut.” AlSalim draws from personal experience: his wife went through five cycles of IVF over three years before they had a child. “He mentions that there is insufficient transparency concerning clinical results and treatment costs.” “Individuals begin IVF without understanding what the final cost will be or how far they can proceed.” AlSalim created Gaia to tackle these issues: the startup collects advance payments from clients and manages all expenses for as many as three IVF cycles. Clients repay later, in installments, only if they have children. “According to AlSalim, we utilize machine learning on extensive public datasets to forecast the results of fertility treatments and assume the financial risk in cases where those treatments do not succeed.” The startup, having secured over $23 million (£17.5 million), operates in the UK, Spain, Greece, and the US. gaiafamily.com
Get Harley
“I experienced acne, seborrheic dermatitis, and eczema at different times in my life,” states Charmaine Chow, CEO of GetHarley. “Previously, I squandered significant quantities of time, money, and energy attempting to discover what suits me.” I envisioned a service that would allow me to connect with practitioners online and provide hard-to-find, medical-grade products delivered to my home promptly. That service was unavailable, so Chow chose to create it. GetHarley, the online platform for consultation and clinician matching that she started in 2019, presently provides over 150,000 patients with access to a network of 1,500 skincare professionals throughout the UK and Ireland. “She states that we have experienced annual growth in the triple digits since we launched.” “We collaborate with over 500 pharmaceutical brands, enabling practitioners to remain brand-neutral while tailoring personalized skincare regimens.” In August 2024, the firm secured $52 million (£39.6 million), with Index Ventures at the helm. getharley.com
Lindus Health
“When I worked as a VC investor, every techbio company I encountered expressed similar frustrations regarding clinical trials,” states Meri Beckwith, cofounder of Lindus Health. “They were behind schedule, exceeding the budget, and becoming increasingly costly.” “Nobody was able to really clarify for me the reason why.” Beckwith finally understood that the offenders were the so-called contract research organizations (CRO), external firms that manage and conduct clinical trials. “Beckwith states that they earn more if the clinical trial performs poorly.” “That’s the hidden truth of the industry.” Lindus Health, established by Beckwith and Michael Young, substitutes the outdated approaches utilized by CROs with a technology platform that automates various stages of a clinical trial. This enables them to finish trials, on average, in half the duration they typically require. “One instance is real-time trial oversight, which can consume as much as half of the trial’s budget,” he states. “CROs achieve this by dispatching individuals to locations to review physical documents.” “Our software directly collects that information.” Lindus, having secured $18 million (£13.7 million), has participated in 91 trials to date. lindushealth.com
Field
Field’s large batteries enable electricity grids to accumulate renewable energy during peak supply and distribute it when there is a demand. The organization was established in 2021 by ex-Bulb cofounder Amit Gudka. A year later, it activated its initial 20-MWh battery storage facility in Oldham, Greater Manchester. “According to Gudka, that was crucial in maintaining a steady supply and ensuring the lights stayed on leading up to Christmas last year, when a major subsea cable transferring electricity between the UK and France failed.” “It could have caused instability throughout the grid if not for several batteries nationwide, including ours.” The startup utilizes lithium-iron phosphate cells obtained from a Chinese producer, with additional battery parts imported from Europe. The startup secured £200 million ($152.4 million) from DIF Capital Partners and currently operates in Italy, Germany, and Spain. Three locations throughout Britain, amounting to 190 MWh, are presently under construction. field.energy
Opna
In 2017, Shilpika Gautam was the first individual to stand-up paddle the complete length of the Ganges River. “During my expedition, I met renewable energy and forestry project developers who all expressed a common issue: they required initial funding to launch their projects,” Gautam states. In 2022, she founded Opna, a platform enabling companies to discover, finance, and track carbon removal initiatives. “Our goal is to release funding for impactful climate projects that tackle climate change swiftly, broadly, and fairly,” she states. To date, it has engaged with over 45 projects globally, concentrating on the global south, in areas like agroforestry, blue carbon, biochar, and direct air capture, which are designed to produce carbon removal advantages, particularly highlighting the effects on communities and biodiversity. “We assess the reliability of the data given by suppliers and evaluate all the risks linked to a project,” she states. “Our standardized diligence, contracting, and portfolio management instruments can help buyers save numerous dollars in expenses, reduce deal timelines, and lower risks associated with net-zero journeys by effectively managing carbon removal portfolios over several years.” Opna has secured a seed funding round of $6.5 million (£7.6 million) with Atomico at the helm. opna.earth
Sylvera
Sylvera assesses and evaluates the efficacy of carbon offset projects, assisting corporate purchasers in making better-informed choices while acquiring carbon credits. The platform employs machine learning algorithms to evaluate elements like the project’s carbon footprint and the correctness of reporting by utilizing various datasets, including satellite information and lidar (light detection and ranging) scans. “We are passionate about ensuring project ratings are accurate,” states Allister Furey, CEO of Sylvera. “We dedicate as much as 120 hours assembling each project rating and assessment, which entails multiple testing phases to guarantee our conclusions are accurate.” In May, it introduced the Sylvera Catalog, providing investors a glimpse into almost 20,000 initiatives, ranging from biochar to landfill methane. In July 2023, the firm secured $57 million (£43.4 million) in series B financing, spearheaded by Balderton Capital, bringing its total external funding to $96 million (£73 million) since its establishment in 2020 by Furey and Sam Gill. sylvera.com
PhysicsX
PhysicsX employs machine learning to conduct simulations for engineers in sectors like aerospace, automotive, energy, and semiconductors. “Physics and chemistry simulations powered by AI will radically change intricate engineering and manufacturing,” states Robin Tuluie, CSEO of PhysicsX. “Our technology substitutes conventional simulation models with Large Physics Models.” These models match the accuracy of numerical simulation but run in a second or less. We’re discussing enhancing physics simulation speed by a factor of 10^4 to 10^5. While they are unable to reveal names, Tuluie mentions that their clients already consist of a leading Formula One team along with significant automotive and renewable energy firms. Launched by Tuluie, an astrophysicist and ex-chief scientist of the Mercedes F1 team, alongside Jacomo Corbo, co-founder of the data agency QuantumBlack, the startup has secured $32 million (£24.3 million) in funding spearheaded by General Catalyst. physicsx.ai
Newcleo
Nuclear tech startup Newcleo is creating a small nuclear power facility that utilizes nuclear waste as its fuel source. Established in 2021 by physicist Stefano Buono, the startup has successfully secured over €400 million (£338.8 million) and has a workforce exceeding 750 individuals across fifteen offices in the UK, France, Switzerland, and Italy. In 2024, NewCleo abandoned its plans for a power plant in Cumbria and chose to invest £4 billion (€4.7 billion) in southern France after personal appeals from French President Emmanuel Macron. A prototype model is in the process of being constructed in Italy, with the initial 30 MW versions scheduled for 2030. newcleo.com
Volt
Volt is an open payment system that allows merchants to accept immediate payments directly. “I noticed an industry that was primed for change, founded on technologies conceived and executed in the ’50s,” says Tom Greenwood, CEO of Volt. “I noticed that a new generation of payment systems was emerging that operated in real-time.” Established by Greenwood, Steffen Vollert, and Jordan Lawrence, Volt is currently operational in 31 nations, encompassing Europe, the UK, Brazil, and Australia. In June of the previous year, they secured a $60 million (£45.7 million) Series B round headed by IVP. Clients comprise Farfetch, Xe.com, and Worldpay. volt.io
