United States Steel Corp. (NYSE:X)

The aggregate inventory levels exhibit a U-shaped trajectory between 2018 and 2022. A consistent contraction is observed from December 31, 2018, through December 31, 2020, where total inventories decreased from 2,092 million USD to a period low of 1,402 million USD. This trend reversed sharply in 2021 and 2022, with total inventories climbing to 2,359 million USD by the end of the analyzed period, representing a 68% increase from the 2020 trough.

Raw Materials

This category demonstrates the most significant volatility and growth. After a decline to 416 million USD in 2020, raw material holdings surged to 1,098 million USD by 2022. The substantial increase in the final two years suggests a strategic stockpiling of inputs or a significant rise in the unit cost of raw materials.

Semi-finished Products

Inventory for semi-finished products shows a cyclical pattern, peaking in 2018 at 1,021 million USD and again in 2021 at 1,056 million USD. Unlike raw materials, this category experienced a contraction in 2022, falling to 811 million USD, indicating a potential acceleration in the conversion of work-in-process to finished goods.

Finished Products

Holdings of finished products remained relatively stable compared to other inventory components. A moderate dip to 300 million USD occurred in 2020, followed by a recovery to 398 million USD in 2022, suggesting a consistent output-to-sales ratio throughout the period.

Supplies and Sundry Items

This segment remained marginalized and stable, with a slight downward trend from 62 million USD in 2018 to 52 million USD in 2022, indicating that overhead supplies have not scaled in proportion to raw material growth.

An analysis of the inventory composition reveals a structural shift. In 2018, semi-finished products constituted the largest portion of total inventory. By 2022, raw materials became the dominant component, accounting for approximately 46.6% of the total inventory value. This shift indicates a transition toward a heavier investment in upstream inputs relative to downstream processed goods.