Bouygues SA is a large diversified French group with significant assets, high total leverage dynamics, and a history of limited use of hybrids (no hybrids issued by 2021-2022 per data). Key considerations:

- Business risk: Bouygues operates as a diversified conglomerate with interests in construction (Bouygues Construction/ telecom via Bouygues Telecom), property, media, etc. It is not a regulated utility or energy-infrastructure player, though it has large capital expenditure and broad cash flows. The S&P/Moodys data imply improving or deteriorating leverage trend; Moody’s adjusted leverage is deteriorating, and S&P Net Debt/EBITDA around 3.26 in 2022 indicates leverage approaching high but manageably funded through cash flows, not a regulated monopoly. This type of profile is not an investment-grade-utility archetype.

- Hybrid suitability: The guidelines label strongly suitable for regulated/infrastructure-like entities with highly visible cash flows and potential rating headroom via hybrids. Bouygues does not fit strictly into regulated utility/infrastructure category. It has not issued hybrids before and market appetite for such for a non-regulated, diversified industrial with cyclical exposure might be limited. The absence of prior hybrid issuance is noted as a strong signal that it is Not Suitable or at best Marginally Suitable.

- Financial metrics: Net debt ~7.44b and EBITDA around (net debt/EBITDA 3.26) suggests leverage concerns; FFO/Net Debt 0.24 indicates relatively low cushion. In the hybrid decision framework, this could limit rating headroom and increase coupon deferral risk if business cycles soften.

- Market conditions: The swap curves and credit market context in 2020-2022 show higher long-term rates; however, Bouygues’ likely rating headroom with hybrids would require stable, predictable cash flows typical of infrastructure; Bouygues' cash flows are more cyclical and diversified.

- Use of proceeds: Hybrids would be used mainly for refinancing, capex, or M&A; for Bouygues, urgent refinancing or rating headroom could be a driver, but given the lack of previous hybrid issuance and mixed credit metrics, it would seem opportunistic rather than core.

Conclusion: Marginally Suitable. It is not strongly suitable due to lack of regulated/infrastructure-like cash flow visibility, not having prior hybrids, and mixed leverage metrics; but there is some potential for incremental headroom if markets price favorably and strategy supports it.

Final answer: <answer>Marginally Suitable</answer>