Boeing shares fell Thursday after a report that regulators are investigating accounting practices for two of its jetliners.
The Securities and Exchange Commission is looking into the aerospace giant's projections about the long-term profitability of its well-known 787 Dreamliner and 747 jumbo aircraft, Bloomberg reported, citing people with knowledge of the matter. The probe surrounds so-called program accounting, which allows Boeing to spread upfront costs of manufacturing over a longer period of time.
"We typically do not comment on media inquiries of this nature," Boeing told CNBC.
Its shares closed nearly 7 percent lower Thursday.
The report comes amid a string of recent difficulties for Boeing. On Wednesday, the airplane maker said it would trim jobs at its commercial airplane unit to cut costs.
Late last month, Boeing reported fourth-quarter net income of $1.51 per share on $23.57 billion in revenue. Its earnings fell from $2.02 per share in the previous year, while sales were down 4 percent.
The company's results reflected an after-tax charge of $569 million that it took as it cuts production of its 747-8 planes in half. Boeing will scale back production starting in September due to weakness in commercial air freight.
Boeing shares have plunged more than 25 percent this year.
— Reuters contributed to this report.