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Comment: Please see WP:REFB for advice on correct referencing using the preferred method of dynamic inline citations and footnotes. DoubleGrazing (talk) 09:37, 31 August 2025 (UTC)
- Comment: Primary sources and routine business reporting do not establish notability per WP:NCORP. DoubleGrazing (talk) 09:36, 31 August 2025 (UTC)
| Serotonin | |
| Industry | Advertising & Marketing |
| Founder | Clair Heaviside & Dom Carter |
| Headquarters | Manchester, United Kingdom |
Number of employees | 40+ |
| Website | https://serotonin.co.uk |
Serotonin
editSerotonin Digital Ltd (commonly known as Serotonin) is a British performance marketing and creative agency headquartered in Manchester, England. The agency specialises in e-commerce growth, paid media, digital strategy, and creative services, with a focus on artificial intelligence (AI)–driven advertising and data-led marketing solutions.¹
Founded in 2019 by Clair Heaviside and Dom Carter, Serotonin has grown into one of Manchester’s independent agencies, with a client base spanning retail, fashion, hospitality, lifestyle, and technology sectors. The company has been recognised in the BIMA 100, Prolific North Top 50 Digital Agencies, and regional and national awards.²
History
editThe company was originally launched in 2019 under the name The Light before rebranding as Serotonin in 2020.¹ Its founders, Clair Heaviside and Dom Carter, both had backgrounds in digital marketing and agency leadership prior to establishing the firm.
In August 2025, Serotonin announced the acquisition of Unparalleled, a Manchester-based e-commerce agency, in a move that consolidated its market position and grew annual EBITDA beyond £1 million.³⁴ Following the acquisition, Serotonin’s headcount increased to more than 40 staff.
Services
editSerotonin provides performance marketing services including:⁵
- E-commerce strategy & management
- Paid search and Google Shopping
- Social media advertising (Meta, Instagram, TikTok, Pinterest)
- Display and programmatic buying
- Out-of-home (OOH) and digital audio campaigns
- Consultancy, forecasting, and performance audits
The company also launched Serotonin Performance Labs in 2025, a subscription-based benchmarking and advisory service for e-commerce brands.⁶
Clients
editNotable clients have included:
- Private White V.C. – appointed to lead digital transformation in 2025.⁷
- Bella Italia – appointed as digital agency of record in 2024.⁸
- British Cycling – appointed as lead marketing partner in 2025.⁹
- ASSOS of Switzerland – cycling apparel performance campaigns.¹⁰
- Rudy’s Pizza – digital growth campaigns.¹¹
- Grainger plc – digital advertising in the property sector.¹¹
- Legal & General – strategy and campaign management for financial services.¹¹
Leadership
editClair Heaviside is Co-Founder and Creative Director. She previously held senior digital marketing roles and co-founded the charity Odd Arts. She was named Business Woman of the Year 2023 at the Women of the Year Awards and listed among NatWest’s Top Ten Female Entrepreneurs to Watch in 2022.¹²
Dom Carter is Co-Founder and Chief Executive Officer. He was recognised as a Tech Pioneer in the BIMA 100 (2023) and named Marketing & Media Professional of the Year at the North West Young Professionals Awards.¹³
Awards and recognition
edit- Prolific North Top 50 Digital Agencies (2025).²
- BIMA 100 (2023).¹³
- Women of the Year Awards (2023) – Clair Heaviside, Business Woman of the Year.¹²
- NWYPA Awards – Dom Carter, Marketing & Media Professional of the Year.¹³
References
edit- Prolific North (2021). What I’ve Learnt: Clair Heaviside, Co-Founder, Serotonin. Retrieved 31 August 2025, from Prolific North.
- Prolific North (2025). Top 50 Digital Agencies 2025. Retrieved 31 August 2025, from Prolific North.
- PR Fire (6 August 2025). Serotonin Acquires Unparalleled to Create £1m+ EBITDA Marketing Powerhouse. Retrieved 31 August 2025, from PR Fire.
- BusinessCloud (6 August 2025). Manchester’s Serotonin acquires Unparalleled as it preps for raise. Retrieved 31 August 2025, from BusinessCloud.
- Serotonin Digital (2025). What We Do. Retrieved 31 August 2025, from Serotonin Digital.
- Serotonin Digital (2025). Serotonin Performance Labs. Retrieved 31 August 2025, from Serotonin Digital.
- Serotonin Digital (21 August 2025). Serotonin to Lead Digital Transformation for Private White V.C. Retrieved 31 August 2025, from Serotonin Digital.
- Serotonin Digital (7 October 2024). Serotonin Appointed Digital Agency To Bella Italia. Retrieved 31 August 2025, from Serotonin Digital.
- Yahoo Finance (18 July 2025). British Cycling Appoints Serotonin as Lead Marketing Partner. Retrieved 31 August 2025, from Yahoo Finance.
- Serotonin Digital (2025). Case Studies – ASSOS. Retrieved 31 August 2025, from Serotonin Digital.
- Serotonin Digital (2025). Case Studies – Rudy’s Pizza, Grainger plc, Legal & General. Retrieved 31 August 2025, from Serotonin Digital.
- Agency Growth Events (2023). Growth Enablers: Clair Heaviside. Retrieved 31 August 2025, from Agency Growth Events.
- Serotonin Digital (2023). About Us – Leadership Recognition. Retrieved 31 August 2025, from Serotonin Digital.
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