SAN FRANCISCO (MarketWatch) -- Apple Inc. AAPL, -0.75% was downgraded by Oppenheimer to a market perform, or neutral, rating after the company announced that it will make its final appearance at the Macworld trade show in January. The company also said CEO Steve Jobs will not be making his traditional keynote address at the event next month. Analyst Yair Reiner cited past rumors of Jobs' health and said the company needs to disclose more information or elaborate on a succession plan. "Until such time, we can no longer continue to recommend Apple as a long-term investment," Reiner wrote.