European stocks closed higher Monday, helped by earnings-driven jumps by Intertek and Heineken and shrugging off the Greek equity market’s dive as it reopened.

The Stoxx Europe 600 SXXP, -3.24% closed up 0.8% at 399.44, building on its rise in July that was its best monthly gain since February.

Greece restarts: Trading in Greek stocks on the Athens Stock Exchange began again Monday after a five-week closure. The Athex Composite GD, -4.28% closed down 16.2% after falling more than 20% out of the gate. The benchmark is off 19.1% year to date. When trading was halted June 29, the benchmark had a year-to-date loss of 3.5%.

“The political uncertainty is such that it will take a while until investor confidence in Greek assets is fully restored,” Gary Jenkins at LNG Capital told Dow Jones Newswires before the market reopened.

Trading was closed down after Greek Prime Minister Alexis Tsipras called a referendum on the country’s bailout terms.

Movers and shakers: Intertek Group PLC ITRK, -1.96% shares finished up 11.3% after the British product-testing company said first-half pretax profit rose 16.1% and said it expects to meet full-year forecasts. The stock scored the day’s biggest gain among Stoxx Europe 600 components.

Heineken NV HEIA, -3.76% was another big winner in the pan-European index, rising 4% as the Dutch brewer posted an 88% rise in first-half profit.

Benchmarks: Germany’s DAX 30 DAX, -4.37% finished up 1.2% at 11,443.72, while France’s CAC 40 PX1, -3.73% rose nearly 0.8% to 5,120.52. The FTSE 100 UKX, -3.37% dipped 0.1% to 6,688.62.

Economic news: Investors got a reading on eurozone manufacturing in July in the Markit purchasing managers index, which came in at 52.4, compared with the 52.2 preliminary estimate.

Released earlier Monday, the Caixin China manufacturing purchasing managers index fell to a two-year low of 47.8 in July.