Fractional COO

A fractional COO is a chief operating officer engaged on a part-time, multi-month basis. The role replaces a full-time COO hire when the operational gap is real but bounded, typically a specific operating-discipline install, a post-acquisition stabilization, or a sponsor-led portfolio operation upgrade.

Fractional COO engagements run on a monthly retainer rather than salary plus equity. At Obsidian Axis Group, retainers are $3,000–$7,500 per month over a three- to nine-month engagement. The economics replace $15,000–$25,000 per month in operational overhead, software spend plus the hidden labor of managing tools nobody fully understands.

When a fractional COO actually fits.

The strongest fits are post-acquisition and lower-middle-market, where the operating gap is acute and the methodology earns its scope. The role also fits two broader operator situations that are easier to overlook.

The PE / LMM core fits

• Post-acquisition. The seller-operator leaves at close. The new owner needs operating discipline installed before the muscle memory walks out.
• Founder bottleneck. A $10M–$50M operator where every decision routes through one person. A fractional COO un-routes the decisions and installs the SOPs.
• Sponsor-led portfolio install. A PE portfolio company that needs documented operating discipline before the next round or strategic-acquirer diligence.
• Pre-sale ops cleanup. 12–18 months from sale, getting the operating system written properly before the data room opens.

The broader operator fits

• The right-sized COO need. You know operations needs senior attention but a full-time COO doesn't fit. Either the comp band ($250K+ base, equity, severance risk) is wrong for your stage, or there isn't 40 hours a week of actual COO work, or both. A fractional engagement scopes to the operating gap, not to a job description. You get the same operating discipline at 20–30% of full-time cost, with a clean exit when the work is done.
• The "I know it could be better but can't name what" diagnosis. The process feels leaky. Decisions take too long. Growth isn't translating into capacity. You can't articulate the specific problem yet. The Diagnose phase of a fractional engagement names the gap with numbers, in writing, in four weeks. You decide whether to keep going from there. No long-term commitment to get the diagnosis itself.

Documented operating discipline.

The deliverable is not a strategy deck. It is a working operating system: SOPs the line managers actually use, KPIs the leadership team reviews on a cadence, decision trees that route work without human bottlenecks, and the trained in-house ability to run all of it without the fractional COO present. The engagement ends when the team has run one full operating cycle without us being essential.

Fractional COO vs full-time COO vs consultant.

See also.

• Fractional COO Services, engagement structure and pricing
• The Axis Method, the methodology used in every engagement
• Operational waste, what we measure during diagnose

Talk through it.

If any of this is relevant to where you are, book a 30-minute scoping call. No pitch deck.