Porter, aged 35, is believed to have links to the Boston area of Lincolnshire and is wanted for Conspiracy to Commit Robbery following a raid at a high-end jewellers in Nottinghamshire.
Nine men and a woman have been charged with a variety of offences in connection with the robbery at Andrew Michael Jewellers in Newark on 9 January 2016.
It is alleged that Matthew Porter assisted in carrying out reconnaissance on the targeted premises in the days and weeks prior to the robbery, provided safe houses for the robbers in the days and weeks both prior and after the attack and also assisted in the movement of stolen vehicles for use in the robbery.
The charity Crimestoppers is now offering the reward of up to £2,000 for information that leads to Porter’s arrest.
Sharon Moseley, East Midlands Regional Manager for Crimestoppers, said: “Someone must know where Matthew Porter is hiding. This man has assisted violent criminals which is why it is critical that he is caught.
“Contacting Crimestoppers will allow you to pass on the information anonymously, safe in the knowledge that we do not want to know who you are, just what you know. You will not have to give a statement to the police or go to court.”
If you have any information, please contact Crimestoppers anonymously on 0800 555 111 or through our Anonymous Online Form at www.crimestoppers-uk.org.
*Note: The reward is valid for three months and will only qualify if information is passed to Crimestoppers’ 0800 555 111 number or anonymous online form at www.crimestoppers-uk.org. Information passed directly to police will not qualify.