During his speech at CERAWeek in Houston, Saudi oil minister Ali al-Naimi made it explicitly clear that Saudi Arabia would not cut production, instead saying that it is high-cost producers that would need to either “lower costs, borrow cash or liquidate” adding that there is “no need for cuts as marginal barrel will get out of the market.” He was right.

His wish is slowly coming true after news that North Dakota’s largest producer, Whiting Petroleum, would suspend all fracking, and that Continental Resources has effectively done the same after reporting that it no longer has any fracking crews working in the Bakken shale.

As Reuters reports, Whiting said it would “suspend all fracking and spend 80 percent less this year, the biggest cutback to date by a major U.S. shale company reacting to the plunge in crude prices.”

It was also confirmation that the Saudi plan to put high-cost producers on ice is working, if only temporarily.

After sliding 5.6% to $3.72, Whiting (WLL) stock jumped 8% to over $4 per share in after-hours trading as investors cheered the decision to preserve capital, even if it means generating far less revenue.

Whiting’s cut is one of the largest so far this year in an energy industry crippled by oil prices at 10-year lows. The cuts will have a big impact in North Dakota, where Whiting is the largest producer.

The Denver-based company said it would stop fracking and completing wells as of April 1. Most of its $500 million budget will be spent to mothball drilling and fracking operations in the first half of the year. After June, Whiting said it plans to spend only $160 million, mostly on maintenance.

Rival producers Hess Corp. (HES) and Continental Resources Inc. (CLR) have also slashed their budgets for the year, though neither has cut as much as Whiting.

As noted above, during its earnings report, Continental said that in 2016, the Bakken drilling program will continue to focus on high rate-of-return areas in McKenzie and Mountrail counties, targeting wells with an average EUR of 900,000 Boe per well.Based on the higher EUR and a lower targeted completed well cost of $6.7 million per well, the Company expects capital efficiency to increase 17% and finding cost to decrease 15% in 2016.