| Date | Vendor | Sector | Specialism | Acquirer | Further Info |
| November 2019 | Croud (UK) | Digital | Performance marketing | LDC (minority stake) | More Info |
| November 2019 | Spire Digital (US) | Digital | Digital transformation consulting | Kin + Carta (UK) | More Info |
| November 2019 | Journalista (UK) | PR | Healthcare communications | ZPB Associates (UK) | More Info |
| November 2019 | ZPR (UK) | PR | - | Finn Partners (US) | More Info |
| November 2019 | Allto Market Research (UK) | Market research | Product testing research | Trinity McQueen (UK) | More Info |
| November 2019 | Jellyfish (UK) | Digital | Digital Performance | Fimalac (FR) | More Info |
| October 2019 | Bow & Arrow (UK) | Digital | Digital ventures | Accenture (US) | More Info |
| October 2019 | Gabara Strategies (UK) | PR | Public affairs and strategic communication | Avisa (FR) | More Info |
| October 2019 | Happen (UK) | Innovation consulting | - | Accenture (US) | More Info |
| October 2019 | Carve Consulting (UK) | Digital | Social | TMP/AIA Worldwide (US) | More Info |
| October 2019 | Decidedly (UK) | Market research | - | Populus (UK) | More Info |
| October 2019 | Firewood (US) | Digital | - | S4 Capital plc (UK) | More Info |
| October 2019 | Serum Consulting (UK) | Creative | Growth and proposition development | AnalogFolk (UK) | More Info |
| October 2019 | EdComs (UK) | PR | Education | EVERFI (US) | More Info |
| October 2019 | Pulsar (UK) | Market research | Social intelligence platform | Access Intelligence (UK) | More Info |
| October 2019 | Creston US Holdings (US) | Marketing | Healthcare communications | Next Fifteen plc (UK) | More Info |
| October 2019 | SuccessFlow (UK) | Digital | Martech | Youwe (NL) | More Info |
| September 2019 | Red Squirrel Communications (UK) | PR | Healthcare communications | Freshwater (UK) | More Info |
| September 2019 | Healthcare 21 (UK) | PR | Healthcare communications | Lucid Group (UK) | More Info |
| September 2019 | Saltare Consulting (UK) | Data | Business intelligence | Acrotrend (UK) | More Info |
| August 2019 | Wired Plus (UK) | Digital | Marketing automation technology | IDHL Group (UK) | More Info |
| August 2019 | ComRes (UK) | Market research | Public policy and reputation strategy | Next Fifteen plc (via Savanta) (UK) | More Info |
| August 2019 | 2e Creative (US) | Advertising | Healthcare communications | Fishawack (UK) | More Info |
| July 2019 | Kantar (UK) | Market research | - | Bain Capital (US) | More Info |
| July 2019 | Capella (UK) | PR | Technology | PAN Communications (US) | More Info |
| July 2019 | Join The Dots (UK) | Market research | Online community research | InSites NV (BE) | More Info |
| June 2019 | re:production (UK) | Advertising | - | Dentsu Aegis (UK) | More Info |
| June 2019 | BizTech (Aus) | Digital | Customer Engagement | S4Capital (UK) | More Info |
| June 2019 | SmartFocus (UK) | Digital | E-Mail Marketing | ACTITO (BE) | More Info |
| June 2019 | MJD Interactive (US) | Digital | - | Valtech (UK) | More Info |
| May 2019 | Incisive Health (UK) | PR | Healthcare | UDG Healthcare plc (UK) | More Info |
| May 2019 | Kyne Communications (US) | Healthcare Comms | - | Huntsworth plc (UK) | More Info |
| May 2019 | Graft Services (UK) | Digital | - | Paragon Group (UK) | More Info |
| May 2019 | ORM/Celerity (UK) | Digital | - | Paragon Group (UK) | More Info |
| May 2019 | MSQ Partners (UK) | Integrated | - | LDC PE (UK) | More Info |
| May 2019 | Quill (UK) | Digital | - | Webedia (FR) | More Info |
| May 2019 | Beaver Group (UK) | Digital | Experiential/Events | Trison Group (ES) | More Info |
| May 2019 | Voluntas (UK) | Market Research | - | IFF Research (UK) | More Info |
| April 2019 | Latitude (UK) | Digital | Search Marketing | Jellyfish (UK) | More Info |
| April 2019 | DirectionGroup (UK) | Integrated | - | Unlimited Group (UK) | More Info |
| April 2019 | Hanover (UK) | PR | - | Avenir Global (CA) | More Info |
| March 2019 | Sepia (UK) | PR | - | OutCast (US) | More Info |
| March 2019 | Qriously (UK) | Market Research | - | Brandwatch (UK) | More Info |
| March 2019 | Dudnyk (US) | Healthcare Comms | - | Fishawack (UK) | More Info |
| March 2019 | Model Citizens (UK) | Data | - | Unlimited Group (UK) | More Info |
| March 2019 | ?WhatIf! (UK) | Market Research | - | Accenture (UK) | More Info |
| February 2019 | Moorgate Communications (UK) | PR | - | Finn Partners (US) | More Info |
| February 2019 | BJM (UK) | Integrated | - | Dentsu Aegis (UK) | More Info |
| February 2019 | Bluedog (UK) | Digital | - | Lucid Group (UK) | More Info |
| February 2019 | Intermarket (US) | PR | - | Lansons (UK) | More Info |
| February 2019 | JJ Marketing (UK) | Integrated | - | Gravity Global (UK) | More Info |
| January 2019 | Planning-Inc (UK) | Data | - | Next Fifteen plc (UK) | More Info |
| January 2019 | LiberoNet (UK) | Digital | - | Ixis (UK) | More Info |
| January 2019 | HCL Marketing (UK) | Integrated | - | MyCleverGroup (UK) | More Info |
| January 2019 | Moov2 (UK) | Digital | - | Etch Group (UK) | More Info |
| January 2019 | Brandworks Consultancy (NL) | Integrated | - | The Big Group (UK) | More Info |
| January 2019 | Gravity Thinking (UK) | Digital | - | Vivaldi (US) | More Info |
| January 2019 | NC Creative (UK) | Integrated | - | Cogent Elliott (UK) | More Info |
| January 2019 | Vincent Consulting (UK) | Market Research | - | The Student Room (UK) | More Info |
| January 2019 | Inside Ideas Group (UK) | Integrated | - | You & Mr Jones (UK) | More Info |