ALT5 Sigma shares surge 18.89% intraday after board approves $100M buyback plan and $15M loan.

think> Okay, let's tackle this query. The user wants me to transform a given Chinese text into a concise news headline following specific rules. First, I need to make sure I understand all the requirements. The company name is ALT5 Sigma. The percentage change is 18.89150943%, which needs to be rounded to two decimal places. That would be 18.89%. The time period is intraday. Now, the reason for the price movement has two main points: a stock repurchase plan and a new CFO appointment. The repurchase plan includes a $100 million maximum, with $50 million in shares (40% of outstanding shares) at a discount to NAV, and a $15 million loan to start it. The CFO appointment is Steven Plumb with a salary and RSUs. I need to condense this into a brief reason. The example uses a sentence structure that starts with the company name, the percentage, time period, and then the reason. So I should mention both the repurchase and the CFO, but keep it concise. Wait, the user mentioned to retain key information. The stock repurchase is a significant factor, so that's essential. The CFO appointment is another key point. Should I combine them with "and" or separate them? The example uses "with the company announcing..." so maybe use a similar structure here. Also, the user wants the percentage rounded to two decimal places without trailing zeros. 18.89 is already two decimals. The time period is intraday, so "in intraday trading". Company name remains unchanged. The reason should be a brief explanation. Let me check the example again. They included the subsidiary's action and the project details. Here, the key points are the repurchase plan and the CFO appointment. I need to structure it as: ALT5 Sigma surged 18.89% in intraday trading, with the company announcing a $100 million stock repurchase plan... and appointing Steven Plumb as CFO. Wait, the repurchase plan includes a loan agreement to start it. Should I mention the $15 million loan? The example included the project details but not all the numbers. The user wants a brief reason, so maybe just the repurchase plan and the CFO. The repurchase plan details: up to 50 million shares (40% of outstanding shares) at a discount to NAV, and a $15 million loan. The example included the subsidiary's action but not all the numbers. So perhaps mention the $100 million repurchase plan and the loan to fund it. Also, the CFO's salary and RSUs might be too detailed for a brief reason. The example didn't include the salary details but mentioned the agreement. So maybe just state that Steven Plumb was appointed as CFO with a contract effective date and compensation structure. Putting it all together: "ALT5 Sigma surged 18.89% in intraday trading, with the company announcing a $100 million stock repurchase plan to buy back up to 40% of outstanding shares at a discount to NAV, and appointing Steven Plumb as CFO with a $339,400 annual salary and 95,337 RSUs." Wait, the user's example included the subsidiary and project details but not the salary. The user's instructions say to provide a brief reason, so maybe the salary is too detailed. Perhaps just mention the appointment and the repurchase plan. Alternatively, maybe the key points are the repurchase plan and the CFO appointment. The example included the subsidiary's action as the main reason. Here, the main reasons are the repurchase and the new CFO. I think the answer should include both reasons. Let me check the example again. The example's reason was the subsidiary's project. Here, the two reasons are the repurchase plan and the CFO. So the brief reason would be the company announced a stock repurchase plan and appointed a new CFO. But the user might want to mention the loan agreement as part of the repurchase plan. The example included the project details. So in this case, maybe mention the $15 million loan to fund the repurchase plan. So the final headline would be something like: "ALT5 Sigma surged 18.89% in intraday trading, with the company announcing a $100 million stock repurchase plan (up to 40% of outstanding shares) funded by a $15 million loan, and appointing Steven Plumb as CFO with a $339,400 annual salary and 95,337 RSUs." But the user wants the percentage rounded to two decimals, which is done. The time period is intraday. The company name is unchanged. The key points are the repurchase plan and the CFO appointment. I think.