Companies in attendance so far include:

3 acorns eco-audits

A Beautiful Green

Active Building Centre

AECOM

AIB

Aldersgate Group

AON

Ashden

Barley Communications

BASIS

Bath & North East Somerset Council

Bright Blue

Britvic PLC

Broadbent Wright Consulting

Calor Gas

CambridgeHOK

Carbon Brief

Carbon Limiting Technologies

Carbon Metrics ltd

CBI

CBRE

CDP

CEN

Central Bank of Brazil

Chester Properties

CISL

Clean Prosperity

ClimateWorks Australia

CLN

Coca-Cola European Partners

Cohn Wolfe

Colliers International

Connected Energy

Connected Places Catapult

Duncan Brack Ltd

Earthshine Group ApS

Ecology Building Society

Economist

Ecosphere+

EDF Energy

Enel

Enerfair Engagement Ltd

Energy 4 Humanity

Energy Networks Association

Energy UK

ENGIE

Federated Hermes

Field Consulting Ltd

Flag

Flogas Britain

FRENCH EMBASSY

Freshfields Bruckhaus Deringer

GJ Renewables Ltd

Global Counsel

Gordon & MacPhail

Grape Global ECO

Great Portland Estate

Greater London Authority

Green Alliance

Green Finance Institut

Green Investment Group

Green Purposes Company

GreenFlex

Greenpeace UK

GRN Sportswear

Grounded

Habito

Hanover Communications

Hawkins Wright

Highlands and Islands Enterprise

Hitachi Rail Limited

HSBC Holdings plc

HSBC Mauritius

Hume Bank

IBM

ICMM

Independent

Industrial Decarbonisation Research and Innovation Centre (IDRIC)

Intu

intu Properties

JJ Charitable Trust

Joh. Berenberg, Gossler & Co. KG

Jones Lang LaSalle

JTI

KeepCup

Kent County Council

Kier Group

Landlord Law Services Ltd

LaSalle Investment Management

Laurence Adams Freelance

Legacy Events

Legal & General Capital

Legal & General Investment Management

Lexington Communications

Likido Limited

Limejump

Lloyds Bank

London Borough of Bromley

lovehoney

LSE

Madano

Make UK 

MCS Charitable Foundation

Menhaden Capital Management LLP

MHo Services

National Grid

National Theatre

National Trust

NATIONWIDE

Octopus Energy

OQ (previously Oman Gas Company)

ORE Catapult

OVO Energy

PA Consulting

Personal Best Consulting Ltd

Pivot Power

Positive News

PricewaterhouseCoopers LLP

REA

Renewableuk

RES

Roger Morton Ltd

Royal Danish Embassy

Sandbag Climate Campaign

ScottishPower

Seahorse Enviromental Communications

ShareAction

She's Epic LTD

Siemens Energy

Signature Management Consultants

Simply Sustainable

Sky

Smart Energy GB

Society for the Environment

SoftBank Group

Spirax Sarco Engineering

SSE Plc

Sustainability

Swedish National Television

SYZYGY Consulting

Tesco

The Climate Group

The Crown Estate

The Renewable Design Company/Rendesco

Think & Do Camden

Third Generation Eviromentalism

TMC Ltd

TPDA

Trafigura

Travis Perkins Plc

Turley Associates

UCL Institute for Sustainable Resources

UK GREEN BUILDING COUNCIL

UK Research & Innovation

UK100

UKSIF

UMI Fund

University of Oxford

Valence Solutions

Vattenfall Wind Power Ltd

VentureXchange Ltd.

Verco

Warmworks Scotland LLP

Wates Group Ltd

Wildwood Ecology

Willmott Dixon

WWF-UK

Zeal Hotels

Zuhlke Engineering Hong Kong Ltd