Rambus Inc. shares fell in the extended session Monday after the chip company reported its earnings for the fourth quarter. Rambus shares fell 6% after hours, following a 0.9% decline to close the regular session at $8.82. The company reported a fourth-quarter loss of $2 million, or 2 cents a share, compared with a loss of $36.2 million, or 33 cents a share, in the year-ago period. Adjusted earnings were 9 cents a share, or 28 cents a share under old accounting rules. Revenue declined to $68.6 million from $101.9 million in the year-ago quarter, but under old accounting rules revenue would have been $102 million. Analysts surveyed by FactSet had forecast earnings of 25 cents a share on revenue of $101.9 million. Rambus has taken to reporting earnings under both new accounting rules, ASC 606, and old rules, ASC 605.