The conglomerate had previously held 10.6 million shares of GE, according to its regulatory disclosure in May. John Flannery became CEO of General Electric on Aug. 1 after Jeff Immelt stepped down after 16 years. Flannery was previously president and CEO of GE Healthcare.
Berkshire appears to be keeping its hand in a legacy part of GE. It reported a 17.5 million share stake in Synchrony Financial, the financing arm of GE that was spun out in a 2014 initial public offering. Shares of Synchrony are down more than 18 percent this year, but they bounced up over 4 percent in after-hours trading Monday.
Berkshire also increased its holdings of Bank of New York Mellon by 52.2 percent, to 50.2 million shares.