The upward trend in Flowserve's ROCE indicates improvements in the company's efficiencies and suggests promising long-term growth prospects. Despite these positive fundamentals, they may not yet be fully recognized by investors, suggesting potential for future stock appreciation.

Insider sale of shares at a price below current value may suggest contentment with lower valuation. However, it doesn't imply insiders believe shares are fully valued. Lack of insider buying and history of sales calls for caution in buying Flowserve stock.

Despite a high P/E ratio, investors retain Flowserve's stocks, buoyed by its superior growth trend. The lofty P/E ratio seems underpinned by expected earnings growth and investor confidence in resilience to market hurdles.

Flowserve's high ROE plays a key part in its significant earnings growth, even with only a small portion of its profits being reinvested. Analysts anticipate further momentum in the company's earnings.