The United Kingdom remains one of California's most consequential foreign investors. Across spring and summer 2026, a striking sequence of announcements — a landmark climate and energy partnership, the largest-ever UK trade mission to the United States, a half-billion-dollar technology investment in Los Angeles, and a hard-won pharmaceutical tariff exemption — has redrawn the map of British capital in the Golden State. This feature examines what changed, what it means, and why it matters for the transatlantic business community.
Reporting window: this article covers developments from approximately February to August 2026, with emphasis on the most recent announcements. Where figures are contested or incomplete, that is noted explicitly.
A top-tier investor, but the ranking has shifted
California's official 2026 Foreign Direct Investment report confirms that British capital remains deeply embedded in the state's economy. The United Kingdom ranks as the second-largest source of foreign direct investment in California, behind Japan, supporting 115,186 jobs across 2,163 establishments and paying an estimated $12.6 billion in wages to Californians.
The British footprint is geographically concentrated in the state's principal commercial centres. Los Angeles County alone accounts for 29,488 UK-supported jobs across 559 establishments, with an estimated wage bill exceeding $3.2 billion. The Governor's Office of Business and Economic Development records leading UK investment in professional services (approximately 19 per cent), metals manufacturing (approximately 18 per cent), accommodation services (approximately 15 per cent), administrative support (approximately 9 per cent) and essential retail trade (approximately 6 per cent) — a profile that spans both the industrial and the high-value service economy.
There is, however, an important qualification that responsible reporting must surface. The 2026 report records a net decline of 15,442 UK-supported jobs compared with the prior year, attributed largely to contraction in some high-wage service sectors, and marks the United Kingdom's move from first to second place overall.
This creates a genuine tension in the public record. Speaking at the Greater Together LA summit in May, British Ambassador to the United States Sir Christian Turner stated that Britain has been, for the past two years, the top foreign investor in California by jobs created. That claim and the state's ranking are not necessarily in conflict — the Ambassador refers to a flow measure (jobs created in recent years), whereas California's ranking reflects the total stock of jobs supported — but readers should hold both figures side by side rather than treat either as the whole picture. The honest summary is that the United Kingdom is unambiguously among California's top two foreign investors, while the most recent state data shows the relationship being reshaped rather than simply expanding.
Clean energy: the UK–California partnership and Octopus Energy's billion-dollar signal
The spring's foundational development came on 16 February 2026, when UK Energy Secretary Ed Miliband and California Governor Gavin Newsom signed a new UK–California Climate and Energy Memorandum of Understanding in London. The agreement refreshes decades of cooperation and is framed explicitly as a vehicle to boost transatlantic investment, support jobs and industry, and connect research institutions and businesses across both economies, prioritising clean energy technology, carbon management, transport decarbonisation and climate resilience.
The MoU was accompanied by a headline commitment from UK-based Octopus Energy Generation, which announced plans to invest nearly $1 billion in Californian clean-technology companies and projects. The package includes a solar-and-battery storage project expected to reach full operation by July 2026, funding for industrial heat-battery innovation, and capital for two Californian carbon-removal companies. The commitment sits within Octopus's broader strategy to deploy $2 billion in the United States energy transition by 2030, positioning California as a core hub for its North American activities.
It would be incomplete not to note the political backdrop. President Donald Trump publicly criticised the agreement as "inappropriate", part of a wider dispute over sub-national climate diplomacy. For British investors and policymakers, this context underscores both the opportunity and the complexity of deepening state-level ties while federal policy signals shift.
Greater Together LA: the largest-ever UK trade mission to the United States
If clean energy set the tone, the centrepiece of the period was Greater Together LA, staged in Los Angeles from 18 to 22 May 2026 and described by the UK Government as the largest-ever UK trade mission to the United States. Part of the GREAT Britain and Northern Ireland Campaign, the mission convened more than 250 UK financial, technology and cultural leaders and was co-hosted by Sir Lucian Grainge of Universal Music Group and Sir Jony Ive of LoveFrom, with British Airways, American Airlines, PwC UK and TSL among the presenting partners.
Arriving on the momentum of King Charles III's state visit to the United States, the mission was designed to translate diplomatic goodwill into commercial activity across advanced manufacturing, technology, life sciences and the creative industries. In his remarks, Sir Christian Turner highlighted the sheer scale of the relationship, noting that bilateral trade now exceeds $430 billion annually, growing at around 4 per cent, with more than $1.7 trillion invested in each other's economies. The choice of Los Angeles as host was deliberate: the city's standing as a global capital of technology, entertainment and investment mirrors precisely the sectors in which the UK–US relationship is deepening most quickly.
One point warrants monitoring. As of late August 2026, no official closing statement quantifying the specific deals, jobs or pipeline value secured by Greater Together LA appeared to have been published. This should be read as an open question rather than evidence of any shortfall — such figures are sometimes released well after an event — but the transatlantic community would do well to watch for it.
The standout transaction: Hg's $500 million investment in Rightsline
The single most significant California-specific transaction of the period was announced on 27 May 2026, when Los Angeles-based Rightsline confirmed a $500 million strategic growth investment from Hg, the UK-headquartered specialist investor in transatlantic technology businesses. Klass Capital, Rightsline's majority owner since 2020, together with Salem Partners and the management team, reinvested alongside Hg.
The deal sits precisely at the intersection of California's comparative advantages: software, media and entertainment, intellectual-property monetisation and AI-enabled enterprise infrastructure. Founded in 2012 and headquartered in Los Angeles, Rightsline provides rights-and-royalties management software used by major studios, publishers, consumer brands and life-sciences firms; its platform processes more than $40 billion in royalties annually and manages over 150 million intellectual-property assets across 28 countries. Hg's investment is intended to accelerate the company's artificial-intelligence roadmap and support its international expansion.
For accuracy, a note of proportion is warranted: the $500 million figure is a transaction value rather than a disclosed measure of new Californian capital expenditure, and neither Californian job creation nor a specific closing date was published in the announcements. Even so, the deal is a powerful signal of the calibre of British capital that California continues to attract — selective, technology-literate, and drawn to businesses whose proprietary data and workflows are difficult to replicate.
Capital chasing California: Northern Gritstone opens in San Francisco
A further, more recent move illustrates a distinct dynamic. In mid-August 2026, Northern Gritstone — the investor backing university spinouts from Leeds, Manchester, Sheffield and Liverpool — announced plans to open a San Francisco office, spending around $1 million on the premises and hiring a Bay Area venture partner. The firm, which has raised £382 million to date, will not invest in American companies; instead, it aims to connect its northern-England deep-tech and life-sciences portfolio with US capital, talent and networks.
Chief executive Duncan Johnson framed the rationale directly, observing that access to American capital allows companies to "grow quicker, because the US is better at procuring, and their risk appetite for technology is higher". The office captures a persistent structural reality: British technology companies seeking scale gravitate towards California, and Northern Gritstone's pragmatic response is to bring US capital to British science rather than exporting the companies wholesale.
Policy tailwinds and headwinds
Two federal policy developments landed squarely within the reporting window and bear materially on the British investment case.
The first is a genuine advantage. Effective 31 July 2026, the additional Section 232 tariff on UK-origin patented pharmaceuticals was reduced from 10 per cent to zero, implementing the US–UK Pharmaceutical Pricing Arrangement. The United Kingdom is understood to be the first country to secure a pathway to a zero-rate on these products. For a relationship in which life sciences looms large — and in which California hosts some of the world's densest biotechnology clusters in the San Francisco Bay Area and San Diego — this is a meaningful, time-bound structural benefit.
The second is a rising cost. On 25 August 2026, the Department of Homeland Security published a proposed rule that would impose a new $103,265 fee on all H-1B cap-subject petitions, payable at filing and in addition to existing fees. The proposal is not yet in effect; a public-comment period runs into late September 2026, significant litigation is anticipated, and the fee — if finalised — would apply to cap-subject petitions filed in 2027. For British companies planning to staff Californian operations with specialist talent, however, this is now a variable that belongs in the investment model from the outset.
What it means for the UK–US business community in Los Angeles
Taken together, these developments point to a coherent signal rather than a series of unrelated announcements: the United Kingdom intends to remain a leading investor in California, aligning capital with the state's climate ambitions, innovation capacity and global cultural reach. The composition of that investment is evolving — towards clean energy, defensible technology and life sciences — even as its overall strategic weight holds.
For our community, the practical opportunities are tangible. British clean-technology firms are actively seeking Californian partners, sites and customers. Deep-tech and life-sciences companies are pursuing US capital and procurement relationships. Creative and technology businesses are exploring cross-Atlantic deal-making in the wake of Greater Together LA. And professional-services and hospitality brands continue to deepen their presence across Los Angeles and the Bay Area. Each of these currents runs directly through the networks that define transatlantic business in Los Angeles.
Outlook
The evidence of spring and summer 2026 suggests a UK–California investment corridor moving into a phase defined by quality and selectivity rather than sheer volume. The installed base remains large enough to support more than 115,000 Californian jobs, while the newest capital is flowing towards climate-aligned sectors and innovation clusters. Two indicators are worth watching in the months ahead: the eventual publication of concrete outcomes from Greater Together LA, and whether the next FDI report confirms a one-year adjustment or a longer structural shift. For businesses and investors on both sides of the Atlantic, the underlying conclusion is clear — British investment in California remains structurally important, and the partnership is being renewed for the sectors that will define the next decade.
References
- California Governor's Office of Business and Economic Development (GO-Biz) — Foreign Direct Investment in California, 2026. https://business.ca.gov/wp-content/uploads/FDI-California-2026.pdf
- California GO-Biz — United Kingdom: Foreign Direct Investment in California, 2026 Factsheet. https://business.ca.gov/wp-content/uploads/United-Kingdom-FDI-2026.pdf
- GOV.UK — UK and California deepen ties on clean energy to boost investment (16 February 2026). https://www.gov.uk/government/news/uk-and-california-deepen-ties-on-clean-energy-to-boost-investment
- GOV.UK — UK–California climate and energy agreement (Memorandum of Understanding). https://www.gov.uk/government/publications/uk-california-climate-and-energy-agreement
- Office of Governor Gavin Newsom — Governor Newsom launches UK climate partnership, welcomes nearly $1 billion Octopus Energy clean-tech commitment (16 February 2026). https://www.gov.ca.gov/2026/02/16/governor-newsom-launches-uk-climate-partnership-welcomes-nearly-1-billion-octopus-energy-clean-tech-commitment/
- pv magazine — Octopus Energy invests $1 billion in California clean technology (17 February 2026). https://www.pv-magazine.com/2026/02/17/octopus-energy-invests-1-billion-in-california-clean-technology/
- Argus Media — UK Octopus Energy invests $1bn in California clean tech. https://www.argusmedia.com/en/news-and-insights/latest-market-news/2789407-uk-octopus-energy-invests-1bn-in-california-clean-tech
- The Telegraph — Trump attacks Miliband over green energy deal with Gavin Newsom (16 February 2026). https://www.telegraph.co.uk/business/2026/02/16/miliband-hypocrisy-net-zero-deal-gavin-newsom/
- GOV.UK — 'Greater Together LA', the largest ever UK trade mission to the US, attracts major corporate sponsors. https://www.gov.uk/government/news/greater-together-la-the-largest-ever-uk-trade-mission-to-the-us-attracts-major-corporate-sponsors
- GOV.UK — Largest ever UK business delegation to the US launches Greater Together Los Angeles (18 May 2026). https://www.gov.uk/government/news/largest-ever-uk-business-delegation-to-the-us-launches-greater-together-los-angeles
- GOV.UK — Greater Together LA: remarks by Sir Christian Turner (20 May 2026). https://www.gov.uk/government/news/greater-together-la-remarks-by-sir-christian-turner
- Hg — Rightsline announces $500 million strategic growth investment from Hg (27 May 2026). https://hgcapital.com/insights/rightsline-announces-500-million-strategic-growth-investment-from-hg
- Rightsline — Rightsline announces $500 million strategic growth investment (27 May 2026). https://www.rightsline.com/press-release/rightsline-announces-500-million-strategic-growth-investment/
- HgCapital Trust plc — Investment in Rightsline (27 May 2026). https://www.hgcapitaltrust.com/news-insights/news/2026/27-05-2026
- Sifted — UK spinout investor Northern Gritstone to open San Francisco office (14 August 2026). https://sifted.eu/articles/uk-spinout-investor-northern-gritstone-to-open-san-francisco-office
- BusinessCloud — Northern Gritstone targets US capital with San Francisco office (15 August 2026). https://businesscloud.co.uk/news/northern-gritstone-targets-us-capital-with-san-francisco-office/
- Federal Register — Notice of Reduction of Tariffs on Patented Pharmaceuticals and Pharmaceutical Ingredients for Products of the United Kingdom (effective 31 July 2026). https://www.federalregister.gov/documents/2026/08/04/2026-15799/notice-of-reduction-of-tariffs-on-patented-pharmaceuticals-and-pharmaceutical-ingredients-for
- U.S. Customs and Border Protection — CSMS #69415934: Reduction of Tariffs on Patented Pharmaceuticals for Products of the United Kingdom (1 August 2026). https://content.govdelivery.com/accounts/USDHSCBP/bulletins/42333fe
- pharmasource.global — US Pharma Tariffs 2026: 100% headline rate, dozens of exceptions (UK first country to secure a zero-rate pathway). https://pharmasource.global/content/policy-briefing/us-pharma-tariffs-100-headline-rate-far-lower-real-world-impact/
- U.S. Citizenship and Immigration Services (USCIS) — DHS Proposes Additional H-1B Fee (25 August 2026). https://www.uscis.gov/newsroom/news-releases/dhs-proposes-additional-h-1b-fee
- Federal Register — Fee for Certain H-1B Petitions (published 25 August 2026). https://www.federalregister.gov/documents/2026/08/25/2026-17324/fee-for-certain-h-1b-petitions
