PARIS--PSA Peugeot-Citroen SA (PEUGY, UG.FR) will lose its slot on France's CAC 40 stock index later this month, trans-Atlantic stock-market operator NYSE Euronext (NYX) said Thursday, a humiliating blow for the storied French auto maker.

In its place, NYSE Euronext will add Belgian chemical maker Solvay SA (SVYZY, SOLB.BT) to France's benchmark blue chip index, the stock exchange company said in a statement following its quarterly review meeting. As part of the move, the troubled auto maker will be relegated to a more minor index, dubbed the CAC Next 20 index. Meanwhile, Solvay will be removed from that list as it moves up to the CAC 40, NYSE Euronext added.

A Peugeot spokesman declined to comment on the index change, which will be effective beginning Sept. 24.

Peugeot's relegation is the latest ignominy for the car maker, which has been battered by the downturn in automobile sales in France and southern Europe, where its sales are concentrated. It has also suffered from strategic missteps that led it to miss the upswing in luxury cars, and lag its competitors in expanding globally. Peugeot's stock is down 77% since July 2011.

Peugeot, which has been part of the CAC 40 since the index was created in 1987, had earlier suggested that it may be "premature" to kick it out of the CAC 40 while it is still working on its turnaround effort. In July, the company announced plans to slash 8,000 jobs in France and save EUR1.5 billion ($1.9 billion) a year in costs by 2015.

But that plan, which involves ending car production at a massive plant north of Paris, also fueled a sharp rebuke from France's government, potentially costing it political capital that could have helped keep it on the list.

The committee in charge of the CAC 40 says that it takes the size of a company's free float, its trading volumes and its market capitalization into consideration when making changes to the index but also considers nondata factors.

Peugeot had a market capitalization of EUR2.04 billion as of the market close on Thursday. That's just barely over half of the next-largest company on the index, French chip maker STMicroelectronics NV (STM, STM.FR).

Escaping the ax Thursday was Alcatel-Lucent (ALU, ALU.FR), which has the smallest market capitalization on the CAC 40, at EUR2.01 billion, but is one of the more heavily traded companies on the index.

Write to Sam Schechner at sam.schechner@wsj.com

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