Luciano Siani Pires
Summary
Luciano Siani Pires is Mosaic’s Executive Vice President and Chief Financial Officer, assuming the CFO role on January 1, 2025 after joining as CFO-designate in November 2024. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))
Biography
Siani Pires previously spent much of his career at Vale S.A., where he was chief financial officer from 2012 to 2021 and later executive vice president for strategy and business development from 2021 to 2023. His Vale responsibilities included finance, investor relations, procurement, shared services, information technology, project implementation and the fertilizer business. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai)) Earlier in his career, he held strategy and human-resources leadership roles at Vale, worked at Brazil’s National Development Bank and was a consultant at McKinsey & Company. He chaired the board of Brazilian logistics company VLI S.A. from 2017 to 2023 and previously served as a non-executive director of Mosaic from 2018 to 2022. He holds a mechanical-engineering degree from the Pontifícia Universidade Católica of Rio de Janeiro and an MBA with a finance specialization from New York University’s Stern School of Business. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))
Notable achievements
- Led finance and investor-relations responsibilities at Vale for roughly nine years, covering a large global mining company. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))
- Held senior strategy and business-development responsibility at Vale after his CFO tenure. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))
- Chaired VLI S.A., a Brazilian rail, port and logistics business, from 2017 through 2023. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))
- Returned to Mosaic after earlier service as a company director, giving him prior familiarity with the fertilizer producer and its board. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))
- Brings finance, capital-markets, strategy and mining-sector experience to Mosaic’s senior leadership team. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))
Problem areas / controversies
- Siani Pires has held Mosaic’s CFO position only since January 1, 2025, so there is limited public evidence for evaluating his long-term record in the role. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))
- He inherited a business exposed to fertilizer-price volatility, operating interruptions, maintenance costs and environmental obligations, rather than starting with a clean operating backdrop. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000128578526000017/mos-20251231.htm?utm_source=openai))
- Mosaic disclosed that his ownership level at December 31, 2025 was 1.6 times base salary against a stated ownership guideline of three times base salary; the filing does not indicate that this represented a violation. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000128578526000061/mos-20260415.htm?utm_source=openai))
- No major personal public controversy involving Siani Pires was identified in the reviewed Mosaic and SEC materials; the principal concerns connected with his role are the company’s financial and regulatory challenges. ([sec.gov](https://www.sec.gov/Archives/edgar/data/1285785/000162828024047321/mos-20241108.htm?utm_source=openai))