Bunkering Companies: How Bunker Suppliers Win Stems

A stem is won before the vessel sails, not when it berths. Bunker suppliers that reach the buying role during the fixture or voyage-planning stage get the enquiry; those that wait for the arrival notice usually get the leftovers.

Bunkering companies compete for a nomination that is often decided weeks ahead, by a person who is not standing on the quay.

Who actually chooses the bunker supplier

The choice rarely sits with the vessel. It sits with the party paying for the fuel and the party accountable for the operation.

• Charterer or operator running a time charter, where the charterer buys the bunkers.
• Owner or DOC holder on a voyage fixture where the owner carries the bunker cost.
• Technical or purchasing superintendent at the ship manager, who vets suppliers and holds the approved vendor list.
• Commercial or chartering desk, which fixes the port call and frequently names the supplier in the recap.

On the vessel itself, the chief engineer and master raise the requirement and can flag a supplier for poor quality or short delivery. They influence the next stem but seldom award the current one.

How a stem is nominated

Nomination follows the voyage, and the paperwork moves faster than the ship.

1. The fixture recap or voyage order fixes the load and discharge ports, plus the bunker port.
2. The operator or agent issues the bunker enquiry with volume, grade, ETA and any quality specification.
3. Suppliers quote against the enquiry, with delivery terms, barge availability and payment terms.
4. The buyer nominates a supplier and the agent raises the bunker request in the port call file.
5. The supplier confirms the stem, the barge slot and the PDA items before the vessel arrives.

Everything after step four is execution. The commercial decision was made earlier, often by email, sometimes weeks out.

Why the window before arrival is the whole game

Vessel schedules slip, and that slippage is where late suppliers lose. The HMM containership HMM Platinum was transmitting “restricted manoeuvrability” on AIS while heading for a port of refuge after a container fire, according to The Maritime Executive. A diverted or delayed ship can re-open a bunker decision that the operator thought was closed.

Routing uncertainty is rising in several trades at once. A South Korean container ship completed the country’s first commercial round trip to Europe via the Arctic, gCaptain reported, which shifts bunker ports away from the usual Mediterranean and Suez calls.

Navigation risk adds a second variable. The UK Maritime and Coastguard Agency warned in Marine Guidance Note 719 that satellite navigation can no longer be taken for granted in busy shipping regions, urging crews to practise navigating without GPS, per Splash247. A vessel that cannot rely on its planned track is a vessel whose bunker port may change.

What the buying role checks before nominating

Superintendents and purchasing managers screen suppliers on evidence, not on price alone.

• Barge availability and delivery window against the vessel’s ETA and berth prospects.
• Grade and specification compliance, including sulphur limits for the trade area.
• Track record on quantity and quality disputes at that port.
• Payment terms and credit standing with the buyer or its trader.
• Sanctions and counterparty screening, which has tightened considerably.

That last point now reaches small suppliers. The EU released its largest-ever sanctions package on Russian defence-industry companies, extending from top yards to small suppliers, The Maritime Executive reported. Bunker buyers increasingly want documentary proof before a stem is confirmed.

Enforcement also shows up in vessel behaviour. A sanctioned Russian-flagged Ro-Ro, Lady Mariia (IMO 9220641), was loitering off Port Said, The Maritime Executive reported. Loitering and waiting vessels still need fuel, but they need it from a supplier that has cleared the counterparty first.

Reading port-call signals before the enquiry lands

Suppliers who track arrivals can approach the buying role while the stem is still open. The signals are public and specific.

• Vessel type and DWT indicate stem size and grade. Capesize buying remains active, with Chinese buyers acquiring tonnage including the Ekaterini V (173,555 dwt), Splash247 reported.
• ETA and berth prospects set the barge window and the delivery risk.
• IMO number links the hull to the DOC holder, manager and operator, which is where the decision sits.
• Port of refuge or diversion status signals a re-opened bunker requirement.

Newbuildings and fleet changes add future demand at specific ports. Steerprop won a contract with Hvide Sande Shipyard for propulsion packages on three Multi-Role Environmental Vessels for the Royal Danish Navy, MarineLink reported, and two European yards changed hands, with Rheinmetall taking over Romania’s Mangalia facility, per Splash247. Yards that build and repair generate sea trials, deliveries and dock movements, each of which consumes fuel at a known port.

Where bunker suppliers lose the stem

Most losses are commercial, not technical.

• Contacting the vessel instead of the office that holds the buying authority.
• Reaching the superintendent after the recap has already named a supplier.
• Sending the same quote to every contact at the same company, which reads as a mass mailing.
• Failing to answer a specification, sanctions or payment-terms question quickly.
• Dropping the follow-up when a buyer says the stem is “for next voyage”.

The supplier that answers first, with the right documents attached and the right role in copy, usually gets the enquiry.

How VesselReach helps

VesselReach by CatalystIQ turns vessel movements at your target ports into conversations with the people who nominate stems, before the ship arrives.

• Vessel intelligence shows vessels near your ports plus scheduled and expected arrivals, which means you approach the buyer while the bunker decision is still open.
• AI company targeting and decision-maker discovery identify the owner, manager, operator or charterer behind each hull and the commercial, technical, purchasing or chartering role that decides, which means your enquiry reaches the right desk.
• Staged email, WhatsApp and phone outreach with automated follow-ups and AI enquiry handling keeps the conversation moving and escalates to a human when needed, which means fewer stems lost to silence.

Book a VesselReach demo and see which vessels are heading for your port this month.