Seagate Technology PLC /zigman2/quotes/201824240/composite STX -0.58% shares fell in the extended session Wednesday even after the data-storage device company's results topped Wall Street forecasts. Seagate shares declined 4.4% after hours, following a 2% rise in the regular session to close at $50.74. The company reported fiscal third-quarter net income of $320 million, or $1.23 a share, compared with $195 million, or 69 cents a share, in the year-ago period. Adjusted earnings were $1.38 a share. Revenue rose to $2.72 billion from $2.31 billion in the year-ago quarter. Analysts surveyed by FactSet had forecast earnings of $1.30 a share on revenue of $2.61 billion. Seagate expects earnings of $1.15 to $1.41 a share on revenue of $2.42 billion to $2.78 billion, while analysts had forecast $1.28 a share on revenue of $2.57 billion.