The 10th round of the TTIP talks took place in Brussels July 13-17.
"Technical progress was made in the regulatory pillar but there remains significant work ahead," the European Commission said in a report.
Negotiators discussed regulatory cooperation concerning automobiles, pharmaceuticals, medical devices, cosmetics, textiles, information and communications technologies, engineering and pesticides.
Apart from regulatory cooperation, negotiators discussed "services… market access goods text and agriculture market access text. No discussions took place on tariffs or procurement during this round."
The TTIP is a controversial US-advocated trade pact that seeks to create the world's largest legislated trade zone. Critics point out that the treaty takes trade legislation and copyright control away from sovereign nations.
More than 2.4 million Europeans voiced their opposition to the deal by signing an online petition against the TTIP and a similar agreement with Canada, known as the Comprehensive Economic and Trade Agreement (CETA).