Lee Martin is is believed to be armed and dangerous and is on the run after a woman was attacked in Solihull on September 5.
The woman, who is known to Martin, was left with minor injuries but managed to escape.
Martin then made off in a car when police went to arrest him the following day.
Crimestoppers is now offering a reward of up to £3,000 for information which leads to his arrest.
Mick Duthie, director of operations at Crimestoppers, said: “Lee Martin is a dangerous man who needs to be taken off the streets to protect the public. This is why our charity is supporting the police by offering a reward and appealing for anonymous information.
“If you know where Lee Martin is, I urge you not to approach him but to speak to us completely anonymously by calling our UK Contact Centre which is open 24/7 on freephone number 0800 555 111 or you can use our simple and secure anonymous online form.
“We know it can be difficult to talk about crime or those involved in illegal activity, especially if they are close to home, which is why our charity is here to help.
"We give people an option of remaining totally anonymous. If you know of Lee Martin’s location, please tell us - nobody will know you contacted us, and you may be eligible for a reward.”
Anyone who sees Martin is urged not to approach him.