What happened 

Shares of Nio (NIO -5.00%), the Chinese electric vehicle marker, were tumbling this morning as investors digested two pieces of negative news: ongoing fears that some Chinese stocks could be delisted from U.S. exchanges and an analyst's price target cut for one of Nio's competitors.

The EV stock was down 3.5% at 11:21 a.m. ET.

So what 

First up, Nio investors may be a bit nervous today after the Chinese ride-sharing company Didi Global said that it's being investigated by the Securities and Exchange Commission about its IPO last year. 

A blue car inside in a auto factory.

Image source: Nio.

Didi didn't disclose many details about the probe, but it comes on the heels of the Chinese government cracking down on U.S.-listed Chinese stocks. Regulatory rules from both countries have caused the share prices of many Chinese stocks to tumble over the past year.

Nio investors are likely keeping a close eye on Didi's news and wondering if more difficulties are ahead for other Chinese stocks.

Additionally, one of Nio's EV peers, Li Auto, received a price target cut from Deutsche Bank analyst Edison Yu. The analyst lowered his price target for Li Auto from $34 to $28 before the company reports its earnings next week.

Nio investors may interpret the price target cut as a sign that Li Auto could report a disappointing quarter, indicating larger headwinds for the broader EV market. 

Now what 

Nio investors have been on a wild ride over the past year, as the company's share price has plummeted by 57%. And investors should probably prepare for more share price swings.

The Federal Reserve is meeting today and tomorrow to make a decision about hiking interest rates to tackle inflation that's reached a 40-year high. That's putting a lot of downward pressure on stocks, and it could continue, as the Fed is expected to increase rates throughout the year. 

That doesn't mean Nio is a bad long-term investment, but shareholders should know that as the market processes shifting news about Chinese stocks, the economy, and inflation, there could be more instability from Nio's stock.