Elon Musk-led Tesla Motor tsla said on Monday its proposed acquisition of SolarCity scty could be delayed due to shareholder lawsuits challenging the deal.

The company said four lawsuits were filed in Delaware between Sept. 1 and Sept. 16 and a potential injunction on the proposed $2.6 billion merger could delay the closing of the deal.

The lawsuits allege, among other things, that both Tesla and SolarCity board members breached their fiduciary duties in connection with the proposed $2.6 billion merger, which the companies expect to close by the end of the year.

As of Friday’s close, SolarCity shares were trading at a 31% discount to Tesla’s stock swap offer, which valued SolarCity shares at $25.37 on Aug 1.

Tesla’s shares have fallen nearly 11% in the same period on skepticism that the company’s shareholders could shoot down the deal.

The company plans to hold a shareholder meeting over the proposed merger this week.

Tesla shares were up 1.6% at $208.76 in early trading on Monday on the Nasdaq. SolarCity shares were little changed at $17.43.

Tesla has been dealing with troubles of its own. The company is facing a severe cash crunch and has said it plans to raise additional money this year to help fund the production of its new Model 3 sedan and build out a massive battery factory.

Some of the funds being raised could also support the SolarCity acquisition, if the deal went through, Tesla said.

Musk is the largest shareholder in both companies, and if the deal goes through, his stake in Tesla could increase to 23.4% from about 21%, including the conversion of his current stake in SolarCity.