NASDAQ OMX Copenhagen A/S 12.05.2010 Nikolaj Plads 6 1067 København K No. 17/10 Report on insider transactions with shares issued by Topsil Semiconductor Materials A/S Pursuant to section 28a of the Danish Securities Trading Act we can report the following transactions based on today's reports from insiders: Name: Jens Borelli-Kjær & related parties Reason: Chairman Issuer: Topsil Semiconductor Materials ID-code: DK 0060221034 Type: New shares Transaction: Purchase (subscription of new shares) Trading date: 12 May 2010 Market: NASDAQ OMX Copenhagen Number: 217,500 Market value DKK: 195,750 Name: Trine Schønnemann Reason: Representative elected by the employees Issuer: Topsil Semiconductor Materials ID-code: DK 0060221034 Type: New shares Transaction: Purchase (subscription of new shares) Trading date: 12 May 2010 Market: NASDAQ OMX Copenhagen Number: 20,500 Market value DKK: 18,450 Name: Martin Overgaard Hansen Reason: CEO, Cemat Silicon S.A. Issuer: Topsil Semiconductor Materials ID-code: DK 0060221034 Type: New shares Transaction: Purchase (subscription of new shares) Trading date: 12 May 2010 Market: NASDAQ OMX Copenhagen Number: 88,251 Market value DKK: 79,425.90 Name: Eivind Dam Jensen (related parties) Reason: Vice-chairman of the Board Issuer: Topsil Semiconductor Materials ID-code: DK 0060221034 Type: New shares Transaction: Purchase (subscription of new shares) Trading date: 11 May 2010 Market: NASDAQ OMX Copenhagen Number: 376,500 Market value DKK: 338,850 Topsil Semiconductor Materials A/S Jens Borelli-Kjær Keld Lindegaard Andersen Chairman CEO +45 40 16 14 82 +45 21 70 87 72 Please note that this translation is provided for convenience only. The Danish version shall prevail in case of discrepancies.