By Peter Nurse

Investing.com - European stock markets are expected to open marginally higher, boosted by generally positive corporate earnings, although gains are likely to be limited on raised geopolitical concerns.

At 02:00 AM ET (0600 GMT), the DAX futures contract in Germany traded 0.1% higher, CAC 40 futures in France climbed 0.2%, and the FTSE 100 futures contract in the U.K. rose 0.2%.

It’s another busy day on the corporate front, and the results have largely been impressive, especially considering the difficult underlying conditions.

Societe Generale (EPA:SOGN) reported a smaller-than-expected loss in the second quarter as the French bank absorbed a 3.3-billion-euro hit following the sale of its Russia unit, helped by buoyant activity across retail and investment banking.

Sticking with the banking sector, Germany's Commerzbank (ETR:CBKG) said it swung to a bigger-than-expected second-quarter net profit, helped by higher interest rates.

French insurance company AXA's (EPA:AXAF) first-half net profit rose 3% as higher revenues from damages and health insurance outweighed the financial impact of the war in Ukraine.

Siemens Healthineers (ETR:SHLG) stuck with its outlook for the 2022 financial year as supply-chain headwinds and COVID-19 lockdowns pushed some of the medical device maker’s sales into the next quarters.

Just Eat Takeaway (AS:TKWY), Europe's largest meals delivery company, reported a smaller core loss for the first half of 2022 and revenue just below forecasts.

However, gains are likely to be limited Wednesday as investors fret over U.S. House of Representatives Speaker Nancy Pelosi's visit to Taiwan, a move that threatens to further dent Sino-U.S. relations and ramp up political tensions in Asia.

Beijing claims the island as part of its territory and strongly opposed the visit, given that Pelosi is the highest-ranking U.S. official to visit the island in 25 years.

On the data front, the latest readings of service PMIs for most of Europe are due, but most of the focus will be on Eurozone producer prices and retail sales data for June.

Oil prices stabilized Wednesday ahead of a key meeting of OPEC+ producers to discuss future output, rebounding after an early fall following a surprise rise in U.S. inventories.

Data from the industry body American Petroleum Institute, released on Tuesday, showed U.S. oil stocks rose by around 2.2 million barrels last, up from a fall of about 4 million barrels in the previous week.

This climb could point to a weakening of demand in the world’s largest consumer, and the official government inventory figures, due later on Wednesday, will also be studied carefully.