With oil giant BP Plc announcing on Thursday that it has been successful in stopping the flow of oil spewing into the Gulf of Mexico, the shares of the company surged late in the day – with BP’s American depositary shares closed up 7.6 percent at $38.92; thereby marking the highest level of the company’s stock since June 4.

The April 20 explosion of the Deepwater Horizon rig had sent BP’s shares tumbling to a 14-year low of $26.75 in late June. However, with the Thursday increase, the stock has recovered nearly 36 percent of its plunge following the explosion.

With BP saying on Thursday that no oil was flowing out of the broken well, with the company testing a new cap placed on top of it, not only the shares of BP but also those of the two other companies – Transocean and Anadarko Petroleum -, connected with the Gulf of Mexico spill, got a boost.

While the rig’s operator Transocean closed 4.5 percent higher at $54.70; Anadarko Petroleum – BP’s minority partner in the oil field – rose 3.2 percent to $49.08. However, compared to the companies’ April 20 close, Transocean is still down 41 percent, while Anadarko is off 34 percent.

Referring to the Thursday stock improvement, Andrew Fitzpatrick, director of investments at Hinsdale Associates, said: “The stock is starting to price in the fact that they are eventually going to get this leak stopped.”