Constellation Energy (CEG) and Alphabet's (GOOG, GOOGL) Google said Tuesday they entered into a 20-year deal to add 890 megawatts of nuclear power to the PJM interconnection grid.

Shares jumped nearly 15%, with intraday trading volume at 8.4 million versus a daily average of about 2.8 million.

Vistra (VST) secured a conditional loan commitment of up to $4.2 billion from the US Department of Energy to fund nuclear plant upgrades and modernization in Pennsylvania and Ohio, the DOE said Monday.

Shares climbed 11% as intraday trading volume rose to over 13.5 million, versus a daily average of roughly 4.7 million.

The OLB Group (OLB) said it suspended its at-the-market equity offering program and its board authorized an initial repurchase of up to one million shares.

Shares almost doubled, with intraday trading volume at over 632.7 million, versus a daily average of about 6.5 million.

Price: 306.55, Change: +38.93, Percent Change: +14.55