The sale of a large number of shares by a major investor like Berkshire Hathaway could lead to a negative perception among other investors, potentially causing a short-term decrease in HP Inc.'s stock price. This is due to concerns over why Berkshire Hathaway decided to reduce its stake, which might be interpreted as a lack of confidence in HP Inc.'s future performance.

The sale of a significant portion of HP Inc. shares by Berkshire Hathaway might not directly impact Berkshire's stock price in the short term, as Berkshire's portfolio is diverse and not heavily reliant on any single investment. However, the move could be interpreted in various ways by the market, depending on the perceived rationale behind the sale.