Figures computed from official regulatory filings — .
Ownershipinsiders 62.04% · institutions 15.67%
In EUR · as of Oct 19, 2026
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Assystem S.A. provides engineering and infrastructure project management services in France, the United Kingdom, and internationally. The company offers siting, licensing, environmental services, system engineering and design, construction management and commissioning, and nuclear safety and risk, as well as project management office, project controls, project management consultancy consulting, and other consulting services. It also provides digital transformation consulting, engineering information systems, data as a source of value, 3D immersive technologies and tools, industrial control systems and cybersecurity, and security and site protection systems. It serves nuclear, hydrogen, renewables, grids, transportation, cities and territorial development, and defense sectors. In addition, the company offers decommissioning and waste processing, treatment, and storage services. The company was formerly known as AssystemBrime S.A. and changed its name to Assystem S.A. in June 2005. Assystem S.A. was founded in 1966 and is based in Courbevoie, France. Assystem S.A. is a subsidiary of HDL Development.
Market information source · Oct 19, 2026
Open-market timeline · full history
54 buys9 sells— close pricebar = usd volume, √ scaleclick a period to filter the table
| Insider | Type | Value · USD | Signals | Details |
|---|---|---|---|---|
| CAROLE DEROUSSIN | Buy | $5.8K | conv 31First in 12mo |
| AMF |
| Christian Jeanneautrack record | Buy | $1.3K | conv 32 | AMF |
| Ashish TANDON | Sell | $81.3K | AMF |
| Emmanuelle CAPIEZ | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 71ClusterFirst in 12mo | AMF |
| Robert PLANA | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61Cluster | AMF |
| Ashish TANDON | Other | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | AMF |
| Ashish TANDON | Sell | $23.1K | AMF |
| Stéphane AUBARBIER | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61Cluster | AMF |
| Kerem SADIKLAR | Sell | $54.4K | AMF |
| marie Helene Korvin | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 70ClusterFirst in 12mo | AMF |
| Simon Barber | Sell | $38.1K | AMF |
| Christian Jeanneautrack record | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 44Cluster | AMF |
| Simon Barber | Other | $78.8K | AMF |
| Kerem SADIKLAR | Other | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | AMF |
| Anne charlotte DAGORN | Other | $358.9K | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $23.2K | conv 6 | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $5.7K | conv 15Unusual size | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $5.5K | conv 6Unusual size | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $17.7K | conv 6Unusual size | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $89.1K | conv 16 | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $89.7K | conv 18 | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $89.2K | conv 16 | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $86K | conv 15 | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $33.4K | conv 15 | AMF |
| HDL DEVELOPMENT Société par actions simplifiéetrack record | Buy | $67.4K | conv 6 | AMF |