Japan supplies 56.9% of U.S. imports of Spark Plugs for Internal Combustion Engines, across 43 countries (year to date through September 2026).
HHI 3,711 of 10,000 · HHI above 1,800. The sum of each country’s squared percentage share; one country with everything scores 10,000.
43 countries supplying this product to the U.S.
| Rank# | Country | Value | Share | YoY | Duty |
|---|---|---|---|---|---|
| 1 | Japan | $27.5M | 54.6% | +4.2% | 14.4% |
| 2 | Germany | $7.3M | 14.6% | +47.8% | 13.6% |
| 3 | China | $7.2M | 14.4% | +87.9% | 48.1% |
| 4 | Mexico | $2.8M | 5.5% | -65.4% | 3.3% |
| 5 | Thailand | $1.4M | 2.8% | -79.5% | 16.5% |
| 6 | South Korea | $1.0M | 2.1% | -13.8% | 4.6% |
| 7 | Bosnia and Herzegovina | $658K | 1.3% | +120.9% | 27.0% |
| 8 | Austria | $594K | 1.2% | +22.7% | 10.0% |
| 9 | Indonesia | $438K | 0.9% | +2.0% | 27.5% |
| 10 | France | $393K | 0.8% | -15.1% | 10.2% |
| 11 | Canada | $191K | 0.4% | +109.0% | 0.0% |
| 12 | India | $179K | 0.4% | +14.9% | 24.7% |
| 13 | Czech Republic | $174K | 0.4% | +35.0% | 7.2% |
| 14 | Singapore | $165K | 0.3% | -- | 0.0% |
| 15 | Italy | $91K | 0.2% | +316.6% | 9.5% |
| 16 | United Kingdom | $50K | 0.1% | -60.5% | 4.8% |
| 17 | Spain | $26K | 0.1% | +84.7% | 8.5% |
| 18 | Brazil | $20K | <0.1% | -59.4% | 27.5% |
| 19 | Turkey | $19K | <0.1% | -- | -- |
| 20 | Taiwan | $10K | <0.1% | +354.9% | 10.0% |
| 21 | Ireland | $9K | <0.1% | -- | 5.6% |
| 22 | Lithuania | $9K | <0.1% | +20.6% | 10.0% |
| 23 | Nigeria | $7K | <0.1% | -- | 0.0% |
| 24 | Poland | $5K | <0.1% | +96.8% | 5.8% |
| 25 | Argentina | $4K | <0.1% | -64.0% | 12.5% |
| 26 | Hungary | hidden | hidden | hidden | hidden |
| 27 | Peru | hidden | hidden | hidden | hidden |
| 28 | Finland | hidden | hidden | hidden | hidden |
| 29 | Portugal | hidden | hidden | hidden | hidden |
| 30 | Australia | hidden | hidden | hidden | hidden |
| 31 | United Arab Emirates | hidden | hidden | hidden | hidden |
| 32 | Netherlands | hidden | hidden | hidden | hidden |
| 33 | Switzerland | hidden | hidden | hidden | hidden |
| 34 | Slovenia | hidden | hidden | hidden | hidden |
| 35 | Denmark | hidden | hidden | hidden | hidden |
| 36 | Romania | hidden | hidden | hidden | hidden |
| 37 | Belgium | hidden | hidden | hidden | hidden |
| 38 | Sweden | hidden | hidden | hidden | hidden |
| 39 | Vietnam | hidden | hidden | hidden | hidden |
| 40 | Malaysia | hidden | hidden | hidden | hidden |
| 41 | Chile | hidden | hidden | hidden | hidden |
| 42 | Hong Kong | hidden | hidden | hidden | hidden |
| 43 | Ecuador | hidden | hidden | hidden | hidden |
Duty is the duty Census calculated on this month's imports for consumption from each country, as a share of their customs value. It applies the rates in force, additional duties such as Section 301, 232 and IEEPA included and claimed trade-agreement preferences netted out, so it is an observed rate rather than a statutory one. It is an estimate, not duty collected: antidumping and countervailing duties, fees and later refunds are not in it. YoY compares year-to-date value with the same months last year.