"Their run over the last few days has been a little bit incongruous and they're certainly giving that back in a hurry today."
A2 fell 2.5 per cent to $11.55. It's shed 7.7 per cent since CEO Jayne Hrdlicka disclosed a share sale at a time when the stock was being added to the FTSE index at the end of last week.
Goodson said the stock has been under pressure since Hrdlicka's sale because she had been upbeat in investor presentations about the company.
"One would hope the board would be having some quite hard words about what on earth went on there and the signal that it sends," he said.
Meridian Energy shed rights to dividends of 11.38 cents per share. It led the market lower, falling 3.6 per cent, or 12 cents, to $3.205. Skellerup Holdings declined 2.7 per cent, or 6 cents, to 2.14, giving up a 7 cent dividend. Ebos Group fell 0.5 per cent to $22.25, or 10 cents, after shedding rights to a 35.5 cent dividend.
NZX posted the biggest gain for the day, up 1.9 per cent to $1.10. Tourism Holdings increased 1.2 percent to $5.75 and SkyCity Entertainment Group advanced 1 per cent to $3.97.
Among blue-chip stocks, Fletcher Building was unchanged at $6.49, Fisher & Paykel Healthcare slipped 0.3 per cent to $14.85, Auckland International Airport decreased 0.5 per cent to $7.35, and Spark New Zealand fell 2 per cent to $3.93.
Gentrack was unchanged at $7 after Forsyth Barr started covering the stock, rating it an 'outperform' with a target price of $7.90.
Outside the benchmark index, Tilt Renewables was unchanged at $2.33. The independent directors again recommended minority shareholders reject a $2.30 a share offer from Infratil and Mercury NZ, saying the suitors' attempts to undermine the independent adviser valuation wasn't an assessment of the renewable energy company's worth. Infratil fell 1.5 per cent to $3.505 and Mercury slipped 0.9 per cent to $3.34.
Cavalier Corp dropped 7.6 per cent to 61 cents after the carpet maker said it will sell its stake in a wool scouring business at an $11.8m loss.