The hardest part of running an S&OP cycle is not building a forecast or balancing a constrained plan. It is sitting at the centre of a process where sales pushes for ambition, operations protects feasibility, finance guards the budget, and leadership expects all three to reconcile into one plan. Someone has to hold that tension together and in many organisations that someone is the supply chain manager. It is also precisely where most cycles quietly break down.
Who actually owns the process?
Before defining the role, it helps to be honest about the title. The person who holds the S&OP process together does not have a fixed job description across companies. In some organisations it is the supply chain manager; in others the demand planner facilitates the cycle, prepares the analysis and chairs the meetings. Which one it is tends to track the maturity of the process more than anything else. Early on, when the focus is mainly on balancing demand and supply volumes, the role sits naturally with planning, demand or supply. As the process matures and becomes more about cross-functional decision-making and business strategy, ownership tends to broaden beyond supply chain altogether, which is why some practitioners caution that leaving S&OP permanently in supply chain’s hands can signal it is a planning exercise rather than an enterprise one, and quietly reduce commercial engagement.
For the rest of this article, “supply chain manager” is shorthand for whoever holds that process role, because the responsibilities are the same regardless of the title on the door.
Orchestrator, not arbiter
There is a persistent misconception that the supply chain manager is the one who decides the S&OP outcome. They do not, and they should not. Sales owns the demand assumptions. Operations owns capacity and supply feasibility. Finance owns the value translation and the link to budget. What the supply chain manager owns is the process: the cadence, the data integrity, the scenarios on the table, and the quality of the trade-offs being discussed.
That distinction changes the nature of the role from referee to orchestrator.
A referee blows the whistle and decides. An orchestrator makes sure every section is playing from the same score, that the right people show up with the right input, and that disagreement surfaces at the planning table rather than weeks later on the warehouse floor. The practical expression of this is unglamorous but decisive: a defined cadence, prepared data circulated before each meeting, and a clear roles-and-responsibilities matrix so everyone knows who provides which input and who signs off on what. When Beltaste rebuilt its S&OP process, one of the first moves was to appoint a dedicated planner to facilitate every meeting and to formalise responsibilities in a RACI model. The decisions stayed with the functions; the process got an owner.
The real job is getting the right input
An S&OP cycle is only as good as what goes into it. The supply chain manager’s most underrated work is upstream: making sure sales delivers a demand view that reflects market reality rather than ambition, that operations is candid about constraints rather than defensive, and that finance is engaged early instead of reacting to a plan it had no hand in shaping.
This is harder than it sounds, because the functions naturally pull in different directions by design, not dysfunction. The standard S&OP sequence builds the separation in deliberately: the demand review produces an unconstrained view of expected demand, and only then does the supply review test it against capacity and constraints. Keeping those two conversations apart is exactly how a process protects sales’ market input from being quietly overruled by operational caution, and prevents an optimistic forecast from being treated as a committed plan. In the Beltaste case this is visible in practice: a statistical baseline is generated first, sales then layers on the promotions and events it alone can see, and the result is an unconstrained forecast that is handed to supply. Neither function’s knowledge gets lost, because the process is designed to capture each at the right moment.
Bringing leadership into the room
The executive review is where many cycles lose their credibility. Either leadership is absent and the plan has no teeth, or leadership over-steers and the cross-functional work is overruled by a single voice. The supply chain manager’s job here is to bring decisions to the table that are already framed: the assumptions, the options, the financial impact, and a clear recommendation instead of a data dump that forces directors to improvise.
It also means getting the right people in the room. A recurring lesson from S&OP transformations is that the executive review needs finance at the table as much as operations. Not only the CEO and COO, but the CFO as well, so the plan is owned in value terms and not just in volumes. Done well, the executive review becomes a decision forum rather than a status update. The supply chain manager does not make the call, but makes sure the call can be made quickly, on the basis of a plan the room recognises as its own.
Where the supply chain manager adds the most value
When the supply chain manager confuses orchestration with ownership, one of two things happens. Either they try to decide everything and the other functions disengage, treating S&OP as someone else’s meeting. Or they decide nothing and the cycle becomes a polite exchange of spreadsheets with no commitment behind it. Neither produces a plan the business will actually execute.
The pay-off of getting it right is concrete. Beltaste described its own shift as moving from working hard to working smart together: less firefighting, fewer last-minute changes, and a sales team that engages with the forecast instead of working around it. That is what a well-run cycle buys: not a perfect plan, but a committed one. The role works when it is understood as stewardship of a shared process, holding the tension between sales, operations, finance and leadership long enough for that commitment to form. It is a demanding position, but it is also where the person who owns the process adds the most value: not as the one with the answer, but as the one who makes sure the right answer can be reached together.
If your S&OP cycle still feels like four functions negotiating rather than one team planning, it is usually a process problem before it is a people problem. See how a structured Sales & Operations Planning approach turns that tension into a single, committed plan, or run a quick Optimo Supply Chain Check-up to see where your cycle is leaking value.