Stock market: Dax continues to weaken, Bitcoin falls below $90,000, Rheinmetall and ThryssenKrupp on the rise

The Dax 's attempt to recover is already running out of steam again on Tuesday. Around an hour before trading began, the X-Dax signaled a loss of 0.5 percent to 22,322 points. The previous week, the Dax had initially ended its record hunt at 22,935 points. The Eurozone's leading barometer, the EuroStoxx 50, is expected to fall by 0.4 percent on Tuesday.

After the initial relief over the outcome of the federal election, the focus is now on the difficult exploratory talks on forming a new government. The generally weak guidelines from overseas are also causing caution.

During the reporting season, the dialysis company Fresenius Medical Care (FMC) published its annual figures and outlook. "Better than expected," was the assessment of one trader. On Tradegate, the shares gained 2.6 percent before trading began on Xetra.

One stock market analyst said of Heidelberg Materials' figures and forecasts that they were solid, but probably not good enough to prevent further profit-taking. The building materials group's shares fell by 2.8 percent on Tradegate.

The online broker Flatexdegiro set itself surprisingly ambitious medium-term targets until 2027. They are significantly above expectations, according to Goldman Sachs. The shares were barely changed on Tradegate.

Rheinmetall is heading towards the 1,000 euro mark with a pre-market increase of 2.2 percent on Tradegate. Expectations of significantly increasing defense spending in Germany and the EU are driving this trend. Thyssenkrupp increased by 2.6 percent. A possible spin-off of the naval business is also fueling speculation.

The US stock markets had not found a common direction at the start of the week. The US standard value index Dow Jones closed trading on Monday with little change at 43,461 points. The broad-based S&P 500 lost 0.5 percent to 5,983 points, and the technology-heavy Nasdaq fell 1.2 percent to 19,287 points. A series of weak US economic data and a disappointing forecast from retail giant Walmart had sparked fears that the world's largest economy could stall.

Asian stocks are falling on Tuesday morning. Investors are worried about the US government's investment restrictions in China. US President Donald Trump signed a directive on Monday to restrict Chinese investments in strategic areas such as chips, artificial intelligence and aerospace. Investors are also still worried about the tariffs planned by Trump.

In Tokyo, the Nikkei index, which includes 225 stocks, fell 1.2 percent to 38,307 points and the broader Topix was 0.4 percent lower at 2,727 points. The Shanghai Stock Exchange lost 0.1 percent to 3,368 points. The index of the most important companies in Shanghai and Shenzhen fell by 0.4 percent to 3,954 points.

The Hang Seng Index in Hong Kong also fell 2.3 percent. Tech giant Alibaba , which had previously pushed the Hong Kong index to a three-year high, plunged 7.8 percent after the company's U.S.-listed shares plunged 10 percent overnight.

The largest cyber currency, Bitcoin, fell by more than 4 percent to below $89,000, its lowest value since mid-January. "Due to fears of a trade dispute between the USA and important trading partners, Bitcoin suffered heavily during the night from Monday to Tuesday," commented analyst Timo Emden of Emden Research. "Investors fear that an escalation of the trade dispute could fuel inflation and thus curb fantasies of interest rate cuts."

Oil prices rose on Tuesday as the USA imposed new sanctions on oil producer Iran. This increased concerns about a supply shortage. On the commodity market, Brent crude oil from the North Sea rose by 0.5 percent to $75.18 per barrel (159 liters). US oil WTI was 0.7 percent stronger at $71.16.

The US government imposed sanctions on Monday against more than 30 brokers, tanker operators and shipping companies for their involvement in the transport of Iranian oil. President Trump said he wanted to reduce Iranian crude oil exports to zero. Iran is the third-largest producer in the Organization of the Petroleum Exporting Countries (OPEC) and produced 3.2 million barrels a day in January, according to a Reuters survey of OPEC production.