Clearspeed Technology (LSE: CSD) caught my attention the other day. The AIM-quoted share slumped 30% after it announced its non-exec chairman, Richard Farleigh of Dragons’ Den fame, had spent £50,000 to increase his stake in the group to 14%. Normally such an investment from such an investor would be seen as good news for shareholders. But Farleigh was buying at 10p per share versus a closing price the day before the announcement of 27p. Clearspeed’s price is now 19p, giving it a market cap of £12m.