Spirit AeroSystems stock shifts to Boeing at 0.1955 shares per share
Published on 09/25/2026 at 16:37 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Spirit AeroSystems stock (ISIN US8485741099) was converted into Boeing shares at a ratio of 0.1955 Boeing shares for each former SPR share on December 8, 2025. The transaction ended Spirit's standalone stock-market story while bringing its aircraft structures business into Boeing.
SPR shares became Boeing stock
According to Robinhood, the corporate action exchanged 0.1955 new Boeing shares for every old SPR share. The platform lists December 8, 2025 as the merger date and says fractional shares were retained.
AeroTime reports that Boeing completed the takeover on December 8, 2025 for approximately USD 8.4 billion. The deal transferred 737 fuselage production and major structures for the 767, 777 and 787 programs to Boeing.
Contract costs rise 43 percent
The financial burden attached to Spirit remains the central current angle. On September 10, 2026, AeroTime reported that Boeing estimated inherited customer deals would cost USD 1.52 billion, USD 455 million more than its initial assessment.
That USD 1.52 billion estimate was 43 percent above the figure calculated at the end of December 2025, according to AeroTime. The comparison matters because it shows how the acquisition's obligations changed after Boeing gained access to Spirit's contracts and operations.
Yahoo Finance reported on September 3, 2026 that Spirit's assumed liabilities exceeded identifiable assets by approximately USD 1.9 billion. The figure included USD 1.52 billion tied to customer contracts priced below current market terms.
What former SPR holders own
The exchange ratio is now the key reference for former Spirit shareholders: one old SPR share corresponds to 0.1955 Boeing shares under the December 8, 2025 merger terms. Spirit AeroSystems had been listed on the NYSE under ticker SPR in the aerospace and defense industry before the transaction.
Boeing's USD 8.4 billion purchase value and the later USD 1.52 billion contract estimate frame the deal differently from the original equity exchange. For former SPR holders, the relevant listed security is Boeing stock, while Spirit's manufacturing operations continue inside Boeing.
Spirit AeroSystems stock facts
- Company: Spirit AeroSystems Holdings, Inc.
- ISIN: US8485741099
- Ticker: SPR
- Trading venue: NYSE
- Sector / Industry: Industrials / Aerospace and Defense
- Corporate action: 0.1955 Boeing shares per former SPR share on December 8, 2025
