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200% share price gain in one day

Long-suffering shareholders in micro-cap lighting controls designer Photonstar Led (PSL:AIM) were treated to a rare upwards share price movement on 28 April.
After issuing a profit warning in January, the tiny firm had been limping along with an ever-decreasing share price. Everything changed last week when a student accommodation developer said it might order 50,000 devices from Photonstar.
The ‘letter of intent’ triggered a 200% one-day share price gain to 1.8p.