Elon Musk delivered a mixed bag for Tesla Inc shareholders, reassuring them that his mass-market electric sedan will arrive on time in July while disclosing the departure of a senior executive and warning the company will probably need another cash infusion.

The Model 3 electric sedan remains on schedule and will reach production of about 5,000 units per week by the end of the year, Tesla said on Wednesday.

Reassurances from Musk on the car's timing are relieving the fret over whether the company can overcome its long history of product delays.

Management ranks, on the other hand, remain unstable; Chief Financial Officer Jason Wheeler, who joined the company about 15 months ago, will leave in April.

Priced at close to $35,000 before incentives, the Model 3 looms as the linchpin in Tesla's plans to manufacture at high volumes and achieve the profitability that's eluded the company in all but two quarters since going public.

After a loss for the final three months of last year, Musk said Tesla will be cutting it close bringing the vehicle to market without seeking more funds for the company coffers.

"How close to the edge do we want to go? According to our financial plan, no capital needs to be raised for the Model 3, but we get very close to the edge," Musk said on a conference call with analysts on Wednesday. Since "that's probably not the best thing for shareholders", the CEO said, "it probably makes sense to raise capital to reduce the risk."

Tesla declined as much as 5.8 percent and traded down 5 percent to $259.75 as of 9:52 am in New York. The stock had surged more than 40 percent from early December through the close on Wednesday, as the steady state of the Model 3 led investors to bid up the 14-year-old company's market value to rival automakers that have been around more than a century and sell millions of cars each year.

The company reported a fourth-quarter loss, excluding some items, of 69 cents a share on Wednesday, narrower than the $1.14-a-share average estimate among analysts surveyed by Bloomberg.

The results were Tesla's first since closing the acquisition of panel installer SolarCity Corp in late November.

Tesla expects to deliver as many as 50,000 vehicles in the first half of this year.

Its ambitions for Model 3 output next year show just how steep a curve Musk intends to climb - the company foresees production of 10,000 units a week by sometime in 2018.

"The Model 3 is designed for manufacturing," Musk told analysts. Compared with the Model S and Model X, both of which can sell for more than $100,000, the smaller Model 3 will be simpler to build.

"It's a very compelling car, and we understand manufacturing a lot better than we did in the past," Musk said.

Hiking output to an annual run rate of half a million Model 3s would put the car on a par with the BMW 3 Series, which competes in a similar price segment.

Other models in a similar sales league include the Volkswagen Passat, Audi A4 or the $24,000 Toyota Camry, according to Juergen Pieper, a Frankfurt-based analyst with Bankhaus Metzler.

"There are only a handful of models in that mid-price range that manage to shift half a million units annually," Pieper said.

"This is a very ambitious and not overly probable target. Mass production, something Tesla hasn't got experience with so far, is very complex."

The Model 3 will rely on lower battery costs from the so-called gigafactory east of Reno, Nevada, that began producing battery cells earlier this year in partnership with Japan's Panasonic Corp.

The two have said they'll start jointly making solar cells and panels this summer at a factory in Buffalo, New York.

Tesla now refers to the solar plant that it acquired as part of the SolarCity merger as Gigafactory 2. The company expects to finalize locations for a total of as many as five factories later this year, according to a letter to shareholders.

Musk has vowed to make 500,000 cars annually in 2018.

Meeting that ambitious target will depend a great deal on the Model 3, which is expected to boast at least 215 miles (350 kilometers) of battery range per charge.

Tesla reported 373,000 pre-orders for the Model 3 as of May, when it last updated its reservation tally.

Scaling up for the car will be costly. Tesla forecast as much as $2.5 billion in capital expenditures for the first half of the year, more than Ryan Brinkman, a JPMorgan Chase & Co analyst, was estimating the company would spend for all of 2017.

Tesla's plans are "seemingly increasing the likelihood of another equity capital raise over the near-term", Brinkman wrote in a note to clients on Thursday. "And with a market cap approaching that of GM and Ford, arguably it could be done on amenable terms."

Tesla's departing CFO Wheeler, a former vice-president of finance at Google, is leaving to "pursue opportunities in public policy", according to a company blog post.

He participated in Wednesday's conference call and will stay through early April as Deepak Ahuja leaves retirement to return for a second tour of duty.

Ahuja, a former vehicle line controller at Ford Motor Co, served as Tesla's CFO from July 2008 through a turbulent period that saw Tesla careen from near bankruptcy to its June 2010 initial public offering. He'll come back to the company he left in late 2015 to help set the stage for the Model 3.

Bloomberg