"I'm not selling any securities because of the attacks in Paris, not at all," he said in a phone interview with CNBC.
As for questions about whether the attacks would delay what many expect to be a Federal Reserve interest rate hike next month, Buffett said: "We never do anything based on what we think the Fed or the market is going to do in the next six months."
When Buffett was on CNBC in September, he said he was buying IBM shares, but did not say how many. In the past six month, IBM stock has dropped nearly 24 percent as of Friday's close.
Other highlights from the filing included details about two major stock sales: a reduction by 7 percent in Berkshire's stake in Wal-Mart, and a 13 percent decrease in Berkshire's stake in Goldman Sachs.
Buffett told CNBC he sold those stocks to help pay for the Precision Castparts deal, not because he's soured on those companies. Berkshire in August agreed to buy Precision Carparts for about $32 billion in cash.
Buffett also said he's selling "billions" of dollars in Munich RE and Swiss RE.