Companies Using Klaviyo in London: 321 Active Firms (2026)
Email-marketing technology adopters sell goods or services through consent-led digital channels from London websites.
Running a consent-led email and SMS automation stack usually points to an ecommerce-led operating model rather than a casual newsletter setup. Buying centres tend to sit across marketing, ecommerce, CRM and customer retention, with finance close enough to care about attribution and repeat-purchase economics. These companies usually sell direct to consumers, although some wholesale and distribution firms use the same stack for trade buyers and repeat-account nurturing. Adoption also signals a certain operating maturity: owned customer lists, behavioural triggers, campaign testing and analytics need staff time, clean consent capture and enough transaction volume to make segmentation worth maintaining.
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London has 321 actively trading companies running this email-marketing stack. Reported employment across the cohort totals 2,215, giving the adoption base a visible operating footprint rather than a purely micro-company profile. The mix is consumer-heavy: e-commerce accounts for 59.5% of detected adopters, Fashion & Retail for 33.3%, FMCG for 16.5%, Wholesale & Distribution for 15.6%, and Beauty & Personal Care for 10.0%. That shape fits the technology’s usual use case: repeat purchasing, promotional calendars, product launches and paid-media follow-up, rather than long enterprise sales cycles.
UK organisations using email and SMS marketing automation operate under PECR, UK GDPR and the Data Protection Act, with ICO guidance shaping day-to-day campaign controls. Marketing emails or texts to individuals need specific consent unless the limited soft opt-in applies to previous customers buying, or negotiating for, similar products or services. Messages also need clear sender identification and a valid unsubscribe or opt-out route. The corporate-body distinction matters for B2B campaigns, since sole traders and some partnerships are treated as individuals. Cookie-based profiling, behavioural advertising and segmentation can also bring PECR cookie rules and UK GDPR obligations into the same workflow.
Adoption appears tied less to experimentation than to retention economics. Companies running this kind of stack tend to have moved beyond simple broadcast email, but many still look operationally lean, so implementation depth is likely to vary. Privacy pressure has been pushing marketers towards cleaner consent capture, clearer preference management and better internal ownership of customer data. At the same time, vendor bundling may pull email, SMS, analytics and onsite personalisation into fewer contracts. Larger retailers are likely to press for more governance and attribution discipline, while smaller consumer brands may keep lighter setups focused on campaigns, replenishment and promotional trading.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
Adoption by company size
Adoption of Klaviyo rises with company size across the trading companies in this cohort. 0% of the 532,485 companies with under 10 employees run Klaviyo (220 detected). 0.6% of the 15,364 companies with 10–50 employees run Klaviyo (94 detected). 0.7% of the 1,763 companies with over 50 employees run Klaviyo (12 detected). That is a 0.7% gap between the over 50 employees and under 10 employees bands.
321
Active firms
2026
33
Above £5M turnover
Trading firms
6
Median headcount
Filed accounts
609
Verified directors
Across this cohort
Top companies using Klaviyo in London
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 3 filingsOperates an online retail store selling cosmetics, skincare, haircare, make‑up, fragrances and beauty tools from multiple brands, alongside its own skincare line, with product discovery tools,…
Targets individual beauty consumers seeking clean skincare, make-up, hair, body, fragrance and wellness products online, including shoppers looking for personalised routines, treatments, gifts and…
Financial Health
StableStable · Hiring · 25% CAGR over 2y
Location
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Computed from 4 filingsOperates an online retail store selling footwear, bags, and accessories for men and women, including trainers, boots, oxfords, golf shoes, handbags, wallets and outerwear, along with shoe care…
Sells direct to UK consumers shopping for men’s and women’s footwear, bags, accessories and outerwear, including workwear, golf, running and occasion styles.
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
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Computed from 5 filingsDesigns and sells luxury ready-to-wear women’s clothing through an online store, including shirts, trousers, dresses, knitwear, jackets, tailoring and co‑ord sets, with collections made from natural…
Sells direct to consumers seeking luxury women’s ready-to-wear clothing, including shirts, tailoring, co-ords, dresses and knitwear, with online shopping and worldwide shipping.
Financial Health
StrongStrong · Hiring · 22% CAGR over 4y
Location
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Computed from 5 filingsDesigns and distributes hairbrushes and hair care tools, including detangling brushes, styling and blow‑dry brushes, scalp massagers and combs, along with detangling sprays and grooming brushes for…
Serves B2C shoppers with varied hair types and hair concerns, including adults, parents buying for children, and pet owners seeking cat and dog grooming products.
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
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Computed from 4 filingsRetailer of contemporary furniture, lighting, tableware and home accessories. Offers sofas, tables, chairs, rugs, cushions and decorative items, including products designed in-house by TCS Studio,…
Sells to design-conscious consumers buying premium furniture, lighting and home accessories for their homes, and also serves trade buyers via wholesale and trade channels. Targets residential…
Financial Health
HealthyHealthy · -85% CAGR over 3y
Location
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Computed from 5 filingsDesigns and sells women's clothing and accessories through an online retail store. Product range includes dresses, coats, jackets, knitwear, denim, tops, trousers, skirts, swimwear, and bridal or…
Sells direct to consumers, targeting women shopping for sustainable, affordable fashion, including everyday clothing, occasion wear, wedding guest dresses and bridesmaid outfits.
Financial Health
StableStable · Hiring · 41% CAGR over 4y
Location
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Computed from 5 filingsOperates an online retail store selling curated clothing, footwear and accessories for men and women, alongside homeware, lifestyle goods, beauty products, books and audio items from various fashion…
Sells to consumers seeking curated men’s and women’s fashion, footwear, accessories, homeware, lifestyle goods, and face/body products, with online shoppers served internationally.
Financial Health
StrongStrong
Location
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Designs and sells fine jewellery and body piercing jewellery, including earrings, ear cuffs, necklaces, bracelets, rings and charms. Offers luxury piercing services, customisation options, and…
Serves consumers worldwide shopping for fine jewellery, luxury piercing pieces and gifts, including women, men and buyers seeking personalised or occasion-based items across the USA, UK and Middle…
Financial Health
N/AN/A
Location
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Computed from 5 filingsDesigns and retails women's designer fashion, including dresses, coats, knitwear, trousers, bags, shoes and jewellery. Sells seasonal collections and accessories through its official online store and…
Targets B2C luxury womenswear customers shopping for designer clothing, bags, shoes and accessories via the official online store and physical boutiques.
Financial Health
StableStable · 0% CAGR over 4y
Location
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Computed from 5 filingsProduces and sells fresh cream celebration cakes through an online store and retail outlets, offering flavours such as chocolate, fruit, Oreo and Biscoff, plus photo, wedding and children's cakes,…
Sells to UK consumers ordering fresh cream cakes for birthdays, weddings, children’s parties and other celebrations, including customers seeking eggless options and home delivery.
Financial Health
StrongStrong · Growing, Hiring · 40% CAGR over 4y
Location
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Computed from 5 filingsOperates restaurants and delicatessens and sells prepared foods, bakery items, pantry ingredients, hampers and gifts through physical locations and an online shop. Publishes recipes and offers…
Sells directly to consumers seeking premium food, dining and gifting, including restaurant guests, deli shoppers, home cooks and buyers of hampers, bakery items, books and vouchers, with an emphasis…
Financial Health
HealthyHealthy · -56% CAGR over 5y
Location
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Computed from 5 filingsDesigns and sells fashion apparel and accessories through an online store, offering collections of clothing including dresses, tops, skirts, trousers, knitwear and swimwear, along with shoes and…
Targets direct-to-consumer fashion shoppers, especially women buying contemporary apparel, swimwear, footwear and accessories online, with UK and US shoppers explicitly addressed through shipping…
Financial Health
HealthyHealthy
Location
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Computed from 5 filingsDesigns and sells baby and children’s clothing, particularly sleepwear such as sleepsuits, pyjamas and sleeping bags made from organic cotton and bamboo fabrics. Also offers bodysuits, daywear,…
Sells to parents, carers and gift buyers shopping for newborns, babies and young children up to around 8, primarily through a direct-to-consumer online retail model.
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
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Computed from 5 filingsRetailer of maternity clothing and accessories sold online, including dresses, tops, jeans, knitwear, loungewear and workwear. Focuses on environmentally and socially responsible womenswear and also…
Sells direct to consumers, targeting expectant mothers and pregnant women seeking environmentally and socially conscious maternity wear for everyday, work, occasion and holiday use.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
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Computed from 5 filingsPrepares fresh pasta and accompanying sauces and delivers them to customers via a weekly subscription service. Customers select dishes online; meals arrive ready to cook and can be prepared in about…
Sells direct to consumers and households seeking fresh pasta meal deliveries, including flexible weekly subscribers and gift card buyers.
Financial Health
StrongStrong · Hiring · 64% CAGR over 4y
Location
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Computed from 5 filingsDesigns and sells women’s fashion clothing through an online retail platform, including dresses, occasionwear, shoes, and accessories, as well as girls’ clothing and plus-size ranges. Offers products…
Sells to consumers shopping for women’s fashion, occasionwear, wedding party outfits, shoes and accessories, including plus-size customers and girls’ clothing buyers.
Financial Health
StableStable · Hiring · 6% CAGR over 5y
Location
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Computed from 5 filingsDesigns and sells women’s clothing and accessories through an online retail store, including dresses, knitwear, tops, trousers, outerwear, shoes and seasonal collections, alongside gift cards and a…
Sells direct to consumers, primarily women buying womenswear online, with UK shoppers explicitly addressed through delivery and returns and international shoppers supported via country-specific…
Financial Health
StrongStrong · Hiring · 52% CAGR over 4y
Location
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Computed from 4 filingsDesigns and sells character‑based plush toys and gifts, including soft toys, keyrings, enamel pins, stationery, water bottles, and small home accessories such as lights and blankets, through an…
Serves consumers buying character-led gifts for babies, children, graduations and seasonal occasions, and retailers interested in stocking playful gift, toy and lifestyle ranges.
Financial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
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Computed from 5 filingsOperates an online retail store selling men’s and women’s clothing, including chinos, trousers, shirts, jackets, dresses and accessories. Offers branded apparel collections and seasonal styles…
Sells directly to UK retail consumers shopping online for men’s and women’s casual, office and everyday clothing, especially chinos, khakis, trousers, tops, outerwear and accessories.
Financial Health
StrongStrong · Hiring · 15% CAGR over 5y
Location
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Computed from 5 filingsDevelops and sells skincare products formulated to support the skin microbiome, including cleansers, serums, creams, masks, oils and eye care products, as well as facial devices and routine-based…
Sells primarily to consumers of all ages and skin types seeking skincare for acne, ageing, dryness, redness, rosacea, pigmentation, puffiness and sensitive skin, with online shopping in the US, UK,…
Financial Health
StrongStrong · Hiring · 3% CAGR over 5y
Location
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Computed from 3 filingsDesigns and sells women’s and men’s clothing including jeans, blazers, shirts, knitwear, dresses and accessories through an online shop, offering seasonal fashion collections, denim, tailoring, and…
Sells direct to consumers shopping online for women’s and men’s fashion, including denim, tailoring, knitwear, dresses, jackets, accessories and seasonal collections across multiple European markets.
Financial Health
StrongStrong · 0% CAGR over 1y
Location
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Computed from 3 filingsDesigns and sells women's watches and jewellery through an online retail store, including bracelets, necklaces, earrings, rings and interchangeable watch straps, with options for personalised pieces…
Sells direct to consumers, primarily women and gift buyers shopping for women’s watches, jewellery and personalised gifts across the UK, Europe, US, Canada and Australia.
Financial Health
HealthyHealthy · Hiring · 50% CAGR over 2y
Location
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Computed from 5 filingsDevelops and sells natural deodorants and body care products, including aluminium‑free deodorant balms, body wash concentrate, body oils, scrubs and skincare accessories. Products are vegan,…
Serves direct-to-consumer personal care shoppers seeking vegan, cruelty-free, plastic-free and gender-free body care, including active consumers and performers who prioritise fragrance, skin…
Financial Health
HealthyHealthy · Hiring · 41% CAGR over 4y
Location
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Computed from 5 filingsDesigns and sells women’s fashion accessories including handbags, purses, wallets, backpacks and novelty bags, along with small accessories such as keyrings, phone cases and scarves, primarily…
Sells direct to consumers, primarily women and gift buyers seeking novelty, vegan-friendly handbags, purses and fashion accessories, with online storefronts for UK/rest of world, US and EU customers.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
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Computed from 5 filingsOperates an online retail platform selling alcoholic beverages, including wine, champagne, gin, whisky, rum, and beer. Offers individual bottles, mixed cases, and gift options for purchase and home…
Serves adult consumers shopping online for wine, champagne, spirits, beer and related alcoholic drinks.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
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Computed from 5 filingsDesigns and sells men’s clothing made partly from surplus fabrics, including shirts, knitwear, jackets, suits, Nehru jackets and waistcoats. Offers accessories such as socks, hats, ties and belts…
Serves individual consumers buying men's clothing and accessories, especially shoppers interested in contemporary British menswear, knitwear, shirts, outerwear, formalwear and Nehru jackets through…
Financial Health
HealthyHealthy · Hiring · 30% CAGR over 4y
Location
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Computed from 3 filingsOperates an online retail store selling skincare, haircare, cosmetics and beauty tools from multiple brands, including Dermalogica. Offers products such as cleansers, treatments, makeup, fragrances,…
Sells primarily to consumers shopping online for beauty, skincare, haircare and fragrance products, including buyers of salon and professional brands. Targets UK retail customers seeking branded…
Financial Health
StableStable · Hiring · 41% CAGR over 2y
Location
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Computed from 3 filingsOnline retailer of art materials, supplying oil, acrylic and watercolour paints, brushes, canvases, papers, painting mediums, and tools. Offers products from multiple brands along with drawing,…
Sells to artists, art students, illustrators, creative professionals, hobbyists and studios buying art materials online, primarily in the UK with international shopping options.
Financial Health
HealthyHealthy · Hiring · 22% CAGR over 2y
Location
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Computed from 5 filingsDesigns and sells furniture, home accessories and decorative objects including cabinets, chairs, lamps, mirrors, trays, porcelain tableware and scented candles, along with textiles, wallpapers and…
Serves affluent consumers, collectors and interior design buyers shopping online for luxury home interiors, furniture, tableware, fragrances and decorative objects.
Financial Health
StrongStrong · 0% CAGR over 5y
Location
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Computed from 3 filingsSelects, matures and sells British and Irish farmhouse cheeses. Retail via online shop and physical stores, and supplies cheese for wholesale and export. Also offers cheese subscriptions, tasting…
Sells to individual cheese buyers via online orders, shop visits, subscriptions and gifts, and to trade customers including wholesalers, exporters, corporate gift buyers and international stockists.
Financial Health
StrongStrong · -4% CAGR over 2y
Location
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Computed from 5 filingsDesigns and sells contemporary women's fashion and accessories through an online retail store, including dresses, tailored jackets, tops, skirts, swimwear, knitwear and leather handbags, alongside…
Targets consumer women seeking contemporary luxury fashion and lifestyle products, including dresses, tailoring, swimwear, accessories and statement pieces, with sizing shown from XS to 3XL.
Financial Health
StrongStrong · Growing, Hiring · 58% CAGR over 5y
Location
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Computed from 5 filingsDesigns and sells bamboo-based sleep products including mattresses, mattress toppers, pillows, duvets, bedding sets and bath textiles through an online store, along with children’s bedding and sleep…
Sells primarily to UK consumers and households shopping online for sleep and home textiles, including adults, parents buying kids’ and baby ranges, and gift buyers; also supports international…
Financial Health
StrongStrong · Growing, Hiring · 54% CAGR over 4y
Location
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Computed from 5 filingsDesigns and sells men’s clothing and accessories, including shirts, overshirts, knitwear, jackets, trousers, denim and footwear. Products are sold through an online store as well as wholesale and…
Serves male consumers shopping for contemporary clothing and accessories online or in retail, with worldwide shipping, and also sells wholesale to fashion retailers and stockists.
Financial Health
HealthyHealthy · Hiring · 49% CAGR over 5y
Location
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Computed from 5 filingsRetailer of kitchenware and cooking equipment for home cooks, including cookware, knives, baking tools and tableware sold online and in stores. Also operates cooking classes, private culinary events,…
Serves UK consumers, especially home cooks and cooking enthusiasts, plus gift buyers and people booking cookery classes or private events through its London stores and online shop.
Financial Health
StrongStrong · Hiring · 13% CAGR over 4y
Location
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Computed from 4 filingsProduces and sells CBD‑infused beverages, CBD oils, gummies, and magnesium-based drinks and powders. Products are marketed as alcohol alternatives and wellness supplements and are sold online…
Sells directly to consumers in the UK seeking alcohol alternatives and wellness products, including CBD drinks, oils, gummies and magnesium drinks. Targets health-conscious adults looking for…
Financial Health
StrongStrong · Hiring · 156% CAGR over 4y
Location
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Computed from 3 filingsRetailer of diamond jewellery including engagement rings, wedding bands, earrings, pendants and bracelets. Offers natural and lab‑grown diamonds, bespoke jewellery design, and tools to customise ring…
Serves UK consumers, especially couples and individuals shopping for engagement rings, wedding bands and diamond jewellery online or by appointment in Hatton Garden.
Financial Health
StrongStrong · 25% CAGR over 1y
Location
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Computed from 3 filingsProduces and sells ready‑to‑heat prepared meals available for online order and delivery. Offers meal‑prep style dishes designed to be reheated at home, providing pre‑portioned cooked meals for…
Targets health-conscious consumers, busy individuals and households seeking convenient fresh meal-prep options that save time while fitting taste and wellness priorities.
Financial Health
StrongStrong · Growing, Hiring · 141% CAGR over 3y
Location
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Computed from 3 filingsDesigns and sells backpacks, bags and accessories made from recycled materials, including roll‑top backpacks, crossbody bags, tote bags, laptop bags and travel bags. Also sells apparel and small…
Serves consumers shopping for everyday, work, travel, gym, baby and gift accessories, including students, key workers, parents, men, women and children, primarily via direct online retail.
Financial Health
StrongStrong · Hiring · 73% CAGR over 2y
Location
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Computed from 5 filingsOperates an online retail store selling vaping products, including e‑liquids, vape kits, prefilled and refillable pods, coils, tanks, and related accessories from multiple vaping brands. Provides…
Sells directly to adult consumers who vape or are switching from smoking, including beginners and experienced users buying vape-related products online.
Financial Health
HealthyHealthy · Hiring · 57% CAGR over 4y
Location
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Computed from 3 filingsDesigns and sells men’s footwear including shoes, boots, trainers, sandals and slippers, alongside clothing such as jackets, knitwear, shirts, trousers and jeans, and accessories including bags,…
Sells direct to male consumers shopping online for footwear, clothing and accessories, with delivery and returns highlighted for customers in the UK, US, EU, Canada and Australia.
Financial Health
StrongStrong · 0% CAGR over 1y
Location
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Computed from 5 filingsDevelops and sells personalised nutritional supplement formulas tailored to individual health data. Uses online health quizzes or blood test analysis and an algorithm to determine micronutrient…
Targets health-conscious consumers, athletes and high-performance individuals seeking personalized nutrition, using health quizzes or blood tests to guide daily supplement choices for wellness,…
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 4y
Location
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Computed from 5 filingsDesigns and sells women’s handbags and accessories, including crossbody bags, tote bags, laptop bags, backpacks and purses. Offers themed collections and gift items through an online store, with…
Sells direct to consumers, primarily women and gift buyers, seeking luxury handbags, purses, work/laptop bags and occasion accessories, with UK customers highlighted and global delivery available.
Financial Health
HealthyHealthy
Location
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Computed from 5 filingsSells nail care and cosmetic products including nail polish, gel manicure kits, base and top coats, nail treatments, removers, and manicure tools. Offers colour collections, treatment kits, and…
Sells direct to consumers shopping for nail polish, nail care, manicure tools, gift sets and at-home gel manicure products, mainly beauty and personal care shoppers buying online.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Computed from 5 filingsDesigns and sells menswear and womenswear clothing, including knitwear, shirts, trousers, outerwear, and denim. Produces seasonal and core collections focused on everyday garments and fabrics such as…
Sells direct to consumers seeking premium menswear and womenswear, particularly style-conscious adults looking for durable everyday wardrobe pieces across knitwear, shirting, trousers, denim and…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
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Computed from 5 filingsDesigns and manufactures contemporary furniture in collaboration with external designers. Produces and sells products including sofas, tables, chairs, beds, desks, shelving, storage units, and…
Sells to consumers furnishing homes and outdoor spaces, plus trade professionals such as interior designers and specifiers. Serves UK online shoppers, with international ecommerce options indicated.
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 4y
Location
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Computed from 5 filingsDesigns, manufactures and sells men’s, women’s and children’s sleepwear, pyjamas, loungewear and leisure clothing, including underwear, robes, knitwear and accessories, supplying quality retail trade…
Sells to consumers shopping online for premium men’s, women’s and children’s sleepwear, loungewear, leisurewear, underwear, gifts and accessories, alongside quality fashion retailers carrying…
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 5y
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Computed from 4 filingsOperates coffee shops and an online store selling single-origin coffee beans. Roasts green coffee in-store using proprietary roasting equipment, and supplies freshly roasted coffee for takeaway…
Sells to consumers, especially coffee drinkers buying single-origin beans, subscriptions, gifts and café beverages. Targets home-delivery customers and in-store visitors seeking specialty coffee,…
Financial Health
StrongStrong · Hiring · 47% CAGR over 3y
Location
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Computed from 5 filingsDevelops and sells natural, vegan haircare and skincare products, including shampoos, conditioners, scalp treatments, face serums, cleansers and moisturisers. Offers ranges targeting issues such as…
Sells direct to consumers seeking natural, vegan haircare and skincare, including shoppers with scalp irritation, thinning hair, curls, dandruff, dry or sensitive skin, ageing, pigmentation and…
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
Location
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Computed from 5 filingsRetailer of men’s clothing and accessories, offering tailored suits, blazers, trousers, shirts, knitwear, outerwear, shoes and accessories. Also provides made‑to‑measure and bespoke tailoring…
Sells to affluent menswear consumers seeking luxury Italian tailoring, ready-to-wear clothing, accessories and bespoke services, including online shoppers and appointment-based tailoring clients.
Financial Health
StableStable · 0% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsDesigns and sells handbags and small leather goods through an online retail store, including crossbody bags, totes, shoulder bags, clutches and top-handle styles, with optional monogramming and…
Serves direct-to-consumer fashion shoppers worldwide seeking premium handbags, including customers buying work bags, totes, clutches, crossbody and shoulder bags, plus gift buyers using monogramming.
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 4y
Location
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Key facts
About 10% of the trading cohort reports turnover above £5M (33 of 321 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (30 firms), so a sizeable share is in its first few filing cycles.
E-commerce is the largest sector tag in the selected email-marketing cohort at 59.5%, followed by Fashion & Retail at 33.3% and FMCG at 16.5%.
Stack patterns point to website-led selling: 61.1% also run a hosted storefront platform, 53.9% use tag-management technology and 42.4% run web analytics.
PECR, UK GDPR and the Data Protection Act govern email, SMS, cookie-based profiling and behavioural advertising for UK organisations using direct-marketing tools.
ICO guidance requires specific consent for marketing emails or texts to individuals unless the limited soft opt-in applies, alongside sender identification and a working opt-out or unsubscribe route.
IAB UK reported £35.5 billion of UK digital advertising spend in 2024, up 13% year on year, while digital retail media reached £1.4 billion.
What else do Klaviyo users run?
Share of the 321 Klaviyo-running UK companies where each technology was also detected. As of June 2026.
Who runs Klaviyo in the UK?
By sector
Sectors overlap, so shares need not sum to 100%.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
6
Median headcount
£723.5K
Median UK turnover
10.3%
Above £5M turnover
30
Incorporated since 2022
Verified directors — included in the file
Director names and roles for these 542 companies, alongside financials and websites, in one Excel + CSV file.
How Klaviyo usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
Klaviyo is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
Klaviyo elsewhere
Frequently asked questions
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