The announcement of a mixed shelf offering and the sale of a significant number of shares by stockholders typically leads to concerns about share dilution among existing shareholders. This can result in a negative short-term impact on the stock price as investors may anticipate a larger supply of shares in the market. The relevance is high as the news directly pertains to Smart Sand Inc, and the importance is significant due to the potential financial impact of the offerings. The confidence level is high, given the typical market reaction to such filings, although the actual impact will depend on investor perception and market conditions.