Figures computed from official regulatory filings — .
Ownershipinsiders 2.63% · institutions 53.97%
In EUR · as of Oct 19, 2026
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Mersen S.A. manufactures and sells electrical power products and advanced materials in France, North America, rest of Europe, the Asia-Pacific, and internationally. It operates through two segments, Electrical Power and Advanced Materials. The company offers fuses, fuse holders and systems, surge protection, accessories, power distribution blocks, IEC fuse switch disconnectors, low-voltage and high power switches, capacitors, cooling, power transfer for rail, isostatic and extruded graphite, bus bar, engineered panels, graphite bursting discs, and heat exchangers, as well as PTFE bellows, pipes, and fittings products and solutions. It also provides carbon brushes, brush-holders, carbon insulation, SSiC, process technologies, carbon/carbon composite, slip rings, DC protection for EV and batteries, corrosion resistant materials, brush gear assembly housing, signal and power transfer systems, dust collectors, industrial current collectors, and power stacks, as well as columns, reactors, and pressure vessels products and solutions. In addition, the company offers simulation tools, on-site maintenance, power stack design optimization, motor maintenance, wind services, electrical test lab, and knowledge center, as well as training for process industries and energy production solutions. It serves semiconductors; electric vehicles; battery energy storage system; solar; wind; railways and metros; aerospace; chemicals; building and infrastructure; electrical power distribution; and energy conversion. The company was formerly known as Groupe Carb/one Lorraine SA and changed its name to Mersen S.A. in May 2010. Mersen S.A. was founded in 1889 and is headquartered in Courbevoie, France.
Market information source · Oct 19, 2026
Open-market timeline · full history
58 buys50 sells— close pricebar = usd volume, √ scaleclick a period to filter the table
| Insider | Type | Value · USD | Signals | Details |
|---|---|---|---|---|
| LUC THEMELINtrack record | Sell | $559.1K | Unusual size | AMF |
| THOMAS BAUMGARTNERtrack record | Sell | $192.8K | Unusual size | AMF |
| Estelle LEGRAND | Sell | $333.6K | Unusual size | AMF |
| FARKAS THOMAS | Sell | $174.1K | AMF |
| JEAN-PHILIPPE FOURNIER | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61Cluster | AMF |
| MATTHIEU ELRIZ | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61ClusterFirst in 12mo | AMF |
| Ferran SACREST | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61ClusterFirst in 12mo | AMF |
| THOMAS BAUMGARTNERtrack record | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 44Cluster | AMF |
| GILLES BOISSEAUtrack record | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 44Cluster | AMF |
| Estelle LEGRAND | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61Cluster | AMF |
| Salvador LAMAS | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61Cluster | AMF |
| Thomas FARKAS | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61Cluster | AMF |
| Delphine JACQUEMONT | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 61Cluster | AMF |
| SYLVIE GUIGANTI | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 60Cluster | AMF |
| LUC THEMELINtrack record | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 44Cluster | AMF |
| SYLVIE GUIGANTI | Sell | $24.8K | AMF |
| Salvador LAMAS | Sell | $22.5K | AMF |
| CHRISTOPHE BOMMIERtrack record | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 79Cluster | AMF |
| Salvador LAMAS | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 79ClusterFirst in 12mo | AMF |
| Eric GUAJIOTY | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 56Cluster | AMF |
| Estelle LEGRAND | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 79Cluster | AMF |
| Thomas FARKAS | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 79Cluster | AMF |
| GILLES BOISSEAUtrack record | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 56Cluster | AMF |
| Delphine JACQUEMONT | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 79Cluster | AMF |
| SYLVIE GUIGANTI | Buy | n/a (Non-cash transaction: the filing states a price of zero (award, gift, exercise)) | conv 79Cluster | AMF |