Container Shipment Data Amazon Sellers
Container Shipment Data Amazon Sellers US Customs Bill of Lading data is the most accessible primary source for Amazon supply chain intelligence. It captures inbound ocean freight shipments to US importers and is publicly available with a 4-8 week lag.
US Customs Bill of Lading data is the most accessible primary source for Amazon supply chain intelligence. It captures inbound ocean freight shipments to US importers and is publicly available with a 4-8 week lag. For an Amazon seller, it shows when competitors received containers, from which factories, and at what volume. Understanding what the data contains — and what it does not — is the foundation of using it correctly.
Why this matters
Container shipment data provides the replenishment signal that BSR cannot: it shows when inventory is being added to a brand's supply chain, not when it is being sold. Combined with BSR (the depletion signal), Customs BOL data gives the complete inventory picture: how fast is inventory leaving (BSR velocity) and how often is it being refilled (Customs cadence)?
Container shipment data provides the replenishment signal that BSR cannot: it shows when inventory is being added to a brand's supply chain, not when it is being sold. Combined with BSR (the depletion signal), Customs BOL data gives the complete inventory picture: how fast is inventory leaving (BSR velocity) and how often is it being refilled (Customs cadence)?
For a new entrant assessing a category, Customs container data shows what the established sellers' supply chains actually look like: their factory relationships (shipper names), their reorder frequency (cadence), and their volume scale (container counts). This is not inferred from Amazon data — it is the raw import record.
What a Bill of Lading record contains
A US Customs BOL record contains: US importer of record (the legal entity receiving the shipment, typically the brand's US entity); shipper name and address (the factory or trading company exporting the goods); notify party (often the US customs broker); vessel name and voyage number; port of loading and port of arrival; arrival date; container count and type; and a.
A US Customs BOL record contains: US importer of record (the legal entity receiving the shipment, typically the brand's US entity); shipper name and address (the factory or trading company exporting the goods); notify party (often the US customs broker); vessel name and voyage number; port of loading and port of arrival; arrival date; container count and type; and a description of the goods. The description is often general (e.g., 'household appliances') and does not identify the specific product or ASIN.
How to query for Amazon competitor intelligence
Tools like ImportYeti and ImportGenius index BOL data by importer name. To find a competitor's import history: search by the brand's US legal entity name (not the Amazon storefront name, which may differ). If the legal entity is unknown, try variations of the brand name, the Amazon seller name, and the parent company.
Tools like ImportYeti and ImportGenius index BOL data by importer name. To find a competitor's import history: search by the brand's US legal entity name (not the Amazon storefront name, which may differ). If the legal entity is unknown, try variations of the brand name, the Amazon seller name, and the parent company. Once the importer record is found, review: shipper factory names, most recent 12 months of arrival dates, container counts, and any factory changes (new shipper names appearing in recent months).
Reading replenishment cadence from BOL data
From the sorted arrival dates, calculate inter-arrival intervals: the number of days between each successive container arrival. A brand with consistent 45-day intervals is on a regular replenishment cycle. Irregular intervals — a 20-day gap followed by a 90-day gap — indicate either opportunistic ordering or a supply disruption.
From the sorted arrival dates, calculate inter-arrival intervals: the number of days between each successive container arrival. A brand with consistent 45-day intervals is on a regular replenishment cycle. Irregular intervals — a 20-day gap followed by a 90-day gap — indicate either opportunistic ordering or a supply disruption. The most recent interval compared to the 12-month average indicates whether the brand is ahead of, at, or behind its normal cadence.
Data gaps and limitations to account for
BOL data gaps include: air freight shipments (not recorded in ocean freight BOL data); shipments below de minimis thresholds; shipments by third-party logistics providers where the importer name is the 3PL entity; brands that import under a parent company name; and the 4-8 week data lag.
BOL data gaps include: air freight shipments (not recorded in ocean freight BOL data); shipments below de minimis thresholds; shipments by third-party logistics providers where the importer name is the 3PL entity; brands that import under a parent company name; and the 4-8 week data lag. The data shows ocean freight arrivals — it does not show inventory levels, FBA stock positions, or sales. It is one signal, not a complete inventory picture.
Decision rule: A container shipment data analysis is complete when: the correct US importer entity is confirmed; 12 months of arrival dates are extracted and cadence is calculated; the most recent interval is compared to the baseline; factory changes are noted; and the 4-8 week data lag is acknowledged in the interpretation. Container data combined with BSR velocity gives the depletion-replenishment read. Container data alone shows the supply side; BSR alone shows the demand side.
Container shipment data analysis checklist
- Competitor's US legal entity name confirmed (may differ from Amazon storefront or brand name)
- BOL data queried in ImportYeti or comparable tool for the confirmed importer name
- Shipper factory name and country extracted from the most recent 12 months of arrivals
- Arrival dates sorted chronologically and inter-arrival intervals calculated
- 12-month baseline cadence calculated: average and standard deviation of inter-arrival intervals
- Most recent inter-arrival gap compared to baseline: on-cadence, ahead, or behind?
- Container count trend noted: are the containers getting larger, smaller, or consistent?
- Factory changes identified: has the shipper name or country changed in the last 24 months?
Common mistakes
Searching by Amazon storefront name rather than the US legal entity name — many brands import under holding company names. Treating a 4-8 week data lag as real-time: the most recent arrival in the database is 4-8 weeks old, not this week.
- Searching by Amazon storefront name rather than the US legal entity name — many brands import under holding company names.
- Treating a 4-8 week data lag as real-time: the most recent arrival in the database is 4-8 weeks old, not this week.
- Using container count as a proxy for units without knowing the product's units-per-container — this varies widely.
- Ignoring that a brand switching from ocean to air freight will appear to stop importing, not actually stop sourcing.
Frequently asked questions
- Why this matters?
- Container shipment data provides the replenishment signal that BSR cannot: it shows when inventory is being added to a brand's supply chain, not when it is being sold. Combined with BSR (the depletion signal), Customs BOL data gives the complete inventory picture: how fast is inventory leaving (BSR velocity) and how often is it being refilled (Customs cadence)?
- What a Bill of Lading record contains?
- A US Customs BOL record contains: US importer of record (the legal entity receiving the shipment, typically the brand's US entity); shipper name and address (the factory or trading company exporting the goods); notify party (often the US customs broker); vessel name and voyage number; port of loading and port of arrival; arrival date; container count and type; and a.
- How to query for Amazon competitor intelligence?
- Tools like ImportYeti and ImportGenius index BOL data by importer name. To find a competitor's import history: search by the brand's US legal entity name (not the Amazon storefront name, which may differ). If the legal entity is unknown, try variations of the brand name, the Amazon seller name, and the parent company.
- What is reading replenishment cadence from bol data?
- From the sorted arrival dates, calculate inter-arrival intervals: the number of days between each successive container arrival. A brand with consistent 45-day intervals is on a regular replenishment cycle. Irregular intervals — a 20-day gap followed by a 90-day gap — indicate either opportunistic ordering or a supply disruption.
- What is data gaps and limitations to account for?
- BOL data gaps include: air freight shipments (not recorded in ocean freight BOL data); shipments below de minimis thresholds; shipments by third-party logistics providers where the importer name is the 3PL entity; brands that import under a parent company name; and the 4-8 week data lag.
This guide is educational. It is not a manufacturing quote, certification review, legal advice, or a guarantee that a product can be built. If you want this applied to your specific product, request a human-reviewed Motor Readiness Scorecard.
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