Shares of the natural-gas exploring units of Delek Group Ltd. plunged the most in 14 years in high volume on concern the discovery of the Mediterranean’s largest field off the coast of Egypt will curtail their exports.
Delek Drilling LP and Avner Oil Exploration LLP, partners in the Leviathan field, declined the most since 2001 in above-average trading volumes at the close in Tel Aviv after Eni SpA discovered the “super giant” field that it says may hold 30 trillion cubic feet of gas, enough to contribute to Egyptian supply for decades. Delek Group dropped 12 percent, the biggest loss since Dec. 23. Ratio Oil Exploration 1992 LP fell 23 percent. The companies are jointly drilling Leviathan, Israel’s largest offshore field, with Houston-based Noble Energy Inc.