The stock is currently trading at around 17 times its expected 2014 earnings, when it should be trading around 14 times earnings given its growth and maturity, Warminger said.
Revenue growth in the latest period was the most disappointing aspect of the result, Warminger said.
Sales from general items fell 1.6 percent as it suffered increased competition as a high New Zealand dollar made new goods from overseas websites more competitive than many second-hand goods from Trade Me, Warminger said.
Trade Me is struggling to boost revenue from new areas, such as the sale of new products through its web site better known for second-hand goods, and its plan to increase fees that real estate agents pay for listing properties through the site, Warminger said.
"Really what it is looking like at the moment is a mature business which is having poor earnings and it is trading on a high valuation which is never a good combination," he said.
Trade Me reiterated today that it expects stronger profit growth over the course of its 2015 financial year. Before today's earnings, analysts were expected the company to increase full-year profit 7 percent this year, before picking up to an 11.2 percent pace in 2015, according to analysts polled by Reuters.
"We've embarked on a period of reinvestment which will impact short-term earnings growth but ensure the company's long-term growth and success," said chairman David Kirk. "We are convinced this is the right approach for Trade Me and we believe investment now will result in stronger market positions and greater growth opportunities in the future."
Investment in the business had gone well and Trade Me will continue to "invest assertively" in the second half of the company's financial year, Kirk said.
Trade Me will pay a first half dividend of 7.6 cents a share on March 25.