No sector involving Louisiana and Mississippi’s public companies was spared Tuesday as the Dow Jones industrials sank more than 500 points and all major indexes shed at least 5 percent.

The Dow Jones lost 508.39 to close at 9,447.11. Light, sweet crude oil for November delivery rose $2.25 to settle at $90.06 a barrel on the New York Mercantile Exchange.

As prices slid, four companies closed at new 52-week lows:

— Power provider Entergy Corp. slid $3.63, or 4.4 percent, to $79.29. Those shares had traded in a previous 52-week range of $81.18 to $127.48.

— The Shaw Group Inc., a major engineering-construction company, dropped $2.71, or 13.1 percent, and closed at $18.02. The previous 52-week range had been $18.52 to $77.30.

— Chemical maker Albermale Corp. fell $2.48, or 9.4 percent, to $23.95, below the previous yearly range of $24.23 to $48.37.

— Independent petroleum producer Energy Partners Ltd. dropped 75 cents, or 12.6 percent, to close at $5.21. The previous 52-week range had been $5.26 to $16.50.

Among regional banking companies, BancorpSouth Inc. dropped $3.27, or 11.9 percent, to $24.28, Hancock Holding Co. was down $2.43, or 5 percent, at $46.21, Iberiabank Corp. fell $1.92, or 3.5 percent, to $52.77 and Whitney Holding Co. dropped $1.83, or 8.3 percent, to $20.12.

Others in the petroleum-related sector also fell:

— Stone Energy Corp. fell $3.84, or 11.3 percent, to $30.25.

— PetroQuest Energy Inc. was down $1.74., or 16.3 percent, to close at $8.93.

— Tidewater Inc. dropped $3.34, to 7.1 percent, to $43.85.

— Hornbeck Offshore Inc. fell $1.14, or 3.6 percent, to $30.25.

Telecommunications provider CenturyTel Inc. was down 77 cents, or 2.1 percent, at $35.50.

Billboard operator Lamar Advertising Co. dropped $1.26, or 4.7 percent, to close at $25.73.

In the health care sector, Amedisys Inc. fell 52 cents, or 1.1 percent, to close at $48.17. LHC Group Inc. slide 1 cent, or .04 percent, to $27.01.

Poultry producer Sanderson Farms Inc. fell $1.38, or 3.8 percent, to $34.53. Egg producer Cal-Maine Foods Inc. dropped 30 cents, or 1.2 percent, to close at $25.57.