NORMAL SITUATION

Institut interuniversitaire des Silicates, Sols et Matériaux

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Company — Normal situation.

Strike-off: 28 juillet 2026

Financial year 2025 · Closed on 31/12/2025

Net result9,9 k €+106,1 %over 1 year

Revenue7,3 M €+4,5 %over 1 year

Equity1,4 M €-39,6 %over 1 year

Workforce19,0 ETP-5,9 %over 1 year

Identity

Source · BCE/KBO

Institut interuniversitaire des Silicates, Sols et Matériaux is a Non-profit organization incorporated in 1973. It employs on average 19,0 ETP workers (FTE).

Legal situation: Normal situation
BCE/KBO no. / VAT: BE 0413.106.271
Incorporation: 19/03/1973
Legal form: Non-profit organization
Latest accounts: 31/12/2025
Average workforce: 19,0 ETP

Joint committees (1)

Signals

ProfitableGood liquidityPositive cashflowPositive EBITDAHealthy social debts

Financials

Source · NBB, 20 filings

Trend over 19 financial years

	2025		2024		2023		2022		2021
Income statement
Revenue	7,3 M €	+4.5%	7 M €	-9.2%	7,7 M €	+0.4%	7,7 M €	+2.4%	7,5 M €
EBITDA	20,5 k €	+113%	-157,4 k €	+50.9%	-320,6 k €	-716%	52,1 k €	-34.6%	79,6 k €
Operating result	10,4 k €	+106%	-165 k €	+53.2%	-352,9 k €	-17482%	2 k €	-60.0%	5,1 k €
Net result	9,9 k €	+106%	-162,6 k €	+53.9%	-352,5 k €	-25245%	1,4 k €	-69.5%	4,6 k €
Balance sheet
Equity	1,4 M €	-39.6%	2,4 M €	+264%	650,5 k €	-16.2%	776,6 k €	-25.5%	1 M €
Total assets	5,2 M €	-16.2%	6,2 M €	+40.4%	4,4 M €	-4.8%	4,6 M €	-0.4%	4,6 M €
Cash	555,7 k €	+69.8%	327,3 k €	-2.7%	336,6 k €	-39.9%	560,2 k €	+4.2%	537,7 k €
Debts	3,7 M €	-1.6%	3,8 M €	+1.5%	3,7 M €	-2.5%	3,8 M €	+6.8%	3,6 M €
Other
Workforce	19,0 ETP	-5.9%	20,2 ETP	+1.5%	19,9 ETP	-4.8%	20,9 ETP	+1.5%	20,6 ETP

Board of directors

Source · NBB, accounts to 31/12/2025

8 active · 33 ended

Active mandates

Christoph Mattheeuws

Director

Active

David Charlet

Director

Active

Maïté Dufrasne

Director

Active

Marie-George Olivier

Director

Active

Michel Lemaire

Chairman of the board of directors

Active

Michel Voué

Director

Active

Rony Snyders

Director

Active

Véronique Feldheim

Director

Active

Ended mandates

André De Haan

Chairman of the board of directors

Ended

André Wauters

Chairman of the board of directors

Ended

André Wauters

Vice-chairman of the board of directors

Ended

André Wauters

Director

Ended

Full financial information

Source · NBB

	2025	2024	2023	2022	2021	2020
Type of account	Abridged model	Abridged model	Abridged model	Abridged model	Abridged model	Abridged model
Start of the financial year	01/01/2025	01/01/2024	01/01/2023	01/01/2022	01/01/2021	01/01/2020
Closing of the financial year	31/12/2025	31/12/2024	31/12/2023	31/12/2022	31/12/2021	31/12/2020
Length of the financial year	12 months	12 months	12 months	12 months	12 months	12 months
Filing date	27/07/2026	12/08/2025	17/07/2024	20/07/2023	04/07/2022	12/07/2021
General meeting	29/06/2026	26/06/2025	19/06/2024	22/06/2023	30/06/2022	24/06/2021
Currency of the financial year	EUR	EUR	EUR	EUR	EUR	EUR
NBB quality label	Satisfying controls	Satisfying controls	Satisfying controls	Satisfying controls	Satisfying controls	Satisfying controls

Financial ratios

Source · NBB

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Annual accounts filings

Source · NBB, 20 filings

Model	Closing	General meeting	Filed	Language	Document
Abridged model	31/12/2025	29/06/2026	27/07/2026	French	PDF
Abridged model	31/12/2024	26/06/2025	12/08/2025	French	PDF
Abridged model	31/12/2023	19/06/2024	17/07/2024	French	PDF
Abridged model	31/12/2022	22/06/2023	20/07/2023	French	PDF
Abridged model	31/12/2021	30/06/2022	04/07/2022	French	PDF
Abridged model	31/12/2020	24/06/2021	12/07/2021	French	PDF
Abridged model	31/12/2019	24/06/2020	13/07/2020	French	PDF
Abridged model	31/12/2018	27/06/2019	25/07/2019	French	PDF
Abridged model	31/12/2017	28/06/2018	06/07/2018	French	PDF
Abridged model	31/12/2016	26/06/2017	21/08/2017	French	PDF
Abridged model	31/12/2015	30/05/2016	24/06/2016	French	PDF
Abridged model	31/12/2014	29/06/2015	10/07/2015	French	PDF
Abridged model	31/12/2013	25/06/2014	23/07/2014	French	PDF
Abridged model	31/12/2012	19/06/2013	16/07/2013	French	PDF
Abridged model	31/12/2011	19/06/2012	06/07/2012	French	PDF
Abridged model	31/12/2010	20/05/2011	06/07/2011	French	PDF
Abridged model	31/12/2009	17/06/2010	15/07/2010	French	PDF
Abridged model	31/12/2008	12/06/2009	25/06/2009	French	PDF
Abridged model	31/12/2007	12/06/2008	26/06/2008	French	PDF
Abridged model	31/12/2006	29/06/2007	27/07/2007	French	PDF

Indicative valuation

The detail comes with the Business plan: low and high bounds, the valuation bridge for each financial year, transaction multiples by sector and size, group valuation and exports.

Discover the Business plan

Disclaimer

Indicative estimate based on public sector multiples and the filed annual accounts. It is neither a certified valuation nor financial or investment advice.

Board of directors

Source · NBB, accounts to 31/12/2025

8 active · 33 ended

Active mandates

Christoph Mattheeuws

Director

Active

David Charlet

Director

Active

Maïté Dufrasne

Director

Active

Marie-George Olivier

Director

Active

Michel Lemaire

Chairman of the board of directors

Active

Michel Voué

Director

Active

Rony Snyders

Director

Active

Véronique Feldheim

Director

Active

Ended mandates

André De Haan

Chairman of the board of directors

Ended

André Wauters

Chairman of the board of directors

Ended

André Wauters

Vice-chairman of the board of directors

Ended

André Wauters

Director

Ended

Ownership and network

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Belgian Official Gazette publications

Source · Belgian Official Gazette

Dissolution05/08/2026
RUBRIQUE FIN (CESSATION, ANNULATION CESSATION, NULLITE, CONC, REORGANISATION JUDICIAIRE, ETC...) - DEMISSIONS, NOMINATIONS
PDF
Mandates06/01/2026
DEMISSIONS, NOMINATIONS
PDF
Mandates31/10/2025
DEMISSIONS, NOMINATIONS
PDF
Mandates30/07/2025
DEMISSIONS, NOMINATIONS
PDF
Other04/03/2024
STATUTS (TRADUCTION, COORDINATION, AUTRES MODIFICATIONS, )
PDF
Mandates16/01/2024
DEMISSIONS, NOMINATIONS
PDF
Mandates22/02/2023
DEMISSIONS, NOMINATIONS
PDF
Mandates10/11/2022
DEMISSIONS, NOMINATIONS
PDF

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A company's peers, by sector and size, are included in the Business plan.

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Timeline

2025
Annual accounts 20259,9 k €↑
2024
Annual accounts 2024-162,6 k €↑
2023
Annual accounts 2023-352,5 k €↓
2022
Annual accounts 20221,4 k €↓
2021
Annual accounts 20214,6 k €↓
2020
Annual accounts 20207,8 k €↑
2019
Annual accounts 20196,7 k €↑
2018
Annual accounts 20186,3 k €↑
2017
Annual accounts 20174 k €↓
2016
Annual accounts 201611,8 k €↑
2015
Annual accounts 20151,3 k €↓
2014
Annual accounts 20141,6 k €↓
2013
Annual accounts 20132,8 k €↓
2012
Annual accounts 20123,4 k €↑
2011
Annual accounts 2011-1,3 k €↓
2010
Annual accounts 20101,6 k €↑
2009
Annual accounts 2009595 €↓
2008
Annual accounts 2008879 €↓
2007
Annual accounts 20071,4 k €
19/03/1973
IncorporationNon-profit organization

Institut interuniversitaire des Silicates, Sols et Matériaux

Overview

Identity

Financials

Board of directors

Financials

Full financial information

Financial ratios

Annual accounts filings

Valuation

Indicative valuation

Directors & structure

Board of directors

Ownership and network

Publications

Belgian Official Gazette publications

Similar companies

Similar companies

Timeline

Timeline