Flowserve Corporation (NYSE:FLS) stock rose 1% on Thursday following disclosure from activist investor Starboard Value LP that it has taken a meaningful position and is pressing the company to hasten operational gains and expand margins.
In a letter delivered to Flowserve’s board, Starboard criticized the company’s recent performance, saying it has underperformed despite participating in favorable end markets. The investor pointed to Flowserve’s exposure to reindustrialization, power generation, nuclear energy and energy security as attractive market dynamics that the company has not fully leveraged due to what Starboard described as deficient execution.
Flowserve’s published results for the first quarter showed negative 10.5% organic revenue growth, a decline Starboard noted is substantially below peer outcomes. Despite the weak start to the year, the company left intact its annual earnings per share guidance. Under that guidance, Flowserve would need approximately 8.0% organic growth in the second half of 2026 to hit its full-year EPS target.
Starboard recognized the company’s longer-term fiscal 2030 objectives - including mid-single-digit organic revenue growth, roughly 20% adjusted operating margins and double-digit adjusted EPS growth - but urged that those goals represent an interim benchmark rather than the totality of achievable improvement.
Central to Starboard’s critique is the margin shortfall. The activist investor said Flowserve’s adjusted operating margins lag the peer median by more than 500 basis points. Starboard attributed the gap to operational execution shortcomings rather than structural differences in portfolio composition, noting that Flowserve’s portfolio bears similarities to higher-margin competitors such as ITT.
The letter signaled that Starboard expects the board to be held responsible if the company fails to produce measurable improvement and suggested that more aggressive measures are needed to accelerate operational change.
Taken together, Starboard’s disclosure and recommendations place increased scrutiny on Flowserve’s near-term operational performance and strategic execution, while leaving the company’s publicly stated targets intact for now.