"We will bring the full force of the law to bear on these counterfeiters so as to deter others from engaging in this crime wherever they are."
The stock gained 9 per cent in the 12 months through Tuesday's close.
Despite Alibaba's effort to rid its sites of fake goods, the US Office of the Trade Representative last month named Taobao a "notorious" market, citing an unacceptably high level of reported counterfeiting and piracy.
Alibaba said it has tightened policies against copyright infringement and made it easier for brands to request fakes be removed.
It took down 380 million product listings and closed about 180,000 stores on its Taobao platform in the 12 months to August, the company said in a letter to the US trade office.
The company was disappointed by the US decision, arguing that it has worked diligently to combat fakes.
The notorious market listing harms Alibaba's ability to expand overseas, where it needs to build relationships with retailers, brands and entertainment companies.
Amazon.com has also stepped up efforts to fight counterfeit goods to boost credibility. In November, Seattle-based Amazon filed two lawsuits against vendors allegedly selling fake items through its online marketplace.
The lawsuit detailed how Amazon is trying to fight counterfeits, which includes spending "tens of millions" of dollars each year on technology to detect bad actors and potentially fake products.
Similar to Amazon, Alibaba said it's using technology such as machine learning and data analysis to identify and take down fakes.
The company said it detected a Taobao merchant suspected of selling counterfeit goods and provided the information to the Shenzhen Luohu District police, who raided the seller on August 10 and confiscated more than 125 counterfeit Swarovski watches.
Another fake Swarovski seller on Taobao was found during the process.
Last month, Alibaba sued Shatui.com, which allegedly links merchants with people willing to falsify purchases and write positive comments that can drive up sellers' rankings on Alibaba.
The company said that from April to July last year it provided leads to Chinese authorities on counterfeiting that helped seize fake goods valued at more than 1.4 billion yuan, spur the arrest of 332 suspects and shut down 417 production lines.
