Occidental Petroleum (HAM:OPC) Change In Inventory: €-9 Mil (TTM As of Mar. 2026)

Author: Vera Yuan Vera Yuan
Vera Yuan
Vera Yuan
Director of Data and Quant Analytics at GuruFocus
Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Reviewed by: Charlie Tian Charlie Tian
Charlie Tian
Charlie Tian
Founder & CEO of GuruFocus
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.

HAM:OPC Occidental Petroleum Corp HAM:OPC
63 GF Score
Price €49.00
GF Value €40.88
Valuation Modestly Overvalued
! 2 Warning Signs
View Full Analysis

What is Occidental Petroleum Change In Inventory?

Occidental Petroleum HAM:OPC -2.22% 63 Change In Inventory is €-9 Mil as of Mar. 2026. GuruFocus rates HAM:OPC with a GF Score™ of 63/100 and a GF Value™ of €40.88 (Modestly Overvalued). The stock has 2 warning signs investors should review.

Occidental Petroleum's change in inventory for the quarter that ended in Mar. 2026 was €-22 Mil. It means Occidental Petroleum's inventory increased by €22 Mil from Dec. 2025 to Mar. 2026 .

Occidental Petroleum's change in inventory for the fiscal year that ended in Dec. 2025 was €10 Mil. It means Occidental Petroleum's inventory declined by €10 Mil from Dec. 2024 to Dec. 2025 .

Occidental Petroleum's Total Inventories for the quarter that ended in Mar. 2026 was €1,611 Mil.

Days Inventory indicates the number of days of goods in sales that a company has in the inventory. Occidental Petroleum's Days Inventory for the quarter that ended in Mar. 2026 was 50.13.

Inventory Turnover measures how fast the company turns over its inventory within a year. Occidental Petroleum's Inventory Turnover for the quarter that ended in Mar. 2026 was 1.82.

Inventory-to-Revenue determines the ability of a company to manage their inventory levels. It measures the percentage of Inventories the company currently has on hand to support the current amount of Revenue. Occidental Petroleum's Inventory-to-Revenue for the quarter that ended in Mar. 2026 was 0.35.

Occidental Petroleum  (HAM:OPC) Change In Inventory Explanation

1. Days Inventory indicates the number of days of goods in sales that a company has in the inventory.

Occidental Petroleum's Days Inventory for the quarter that ended in is calculated as:

Days Inventory=Average Total Inventories/Cost of Goods Sold*Days in Period
=1583.736/2883.045*365 / 4
=50.13

2. Inventory Turnover measures how fast the company turns over its inventory within a year.

Occidental Petroleum's Inventory Turnover for the quarter that ended in Mar. 2026 is calculated as

Inventory Turnover=Cost of Goods Sold / Average Total Inventories
=2883.045 / 1583.736
=1.82

3. Inventory-to-Revenue determines the ability of a company to manage their inventory levels. It measures the percentage of Inventories the company currently has on hand to support the current amount of Revenue.

Occidental Petroleum's Inventory to Revenue for the quarter that ended in Mar. 2026 is calculated as

Inventory-to-Revenue=Average Total Inventories / Revenue
=1583.736 / 4523.95
=0.35

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Occidental Petroleum Change In Inventory Related Terms

Occidental Petroleum Change In Inventory Historical Data

* Premium members only.

The historical data trend for Occidental Petroleum's Change In Inventory can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Occidental Petroleum Change In Inventory Chart

Occidental Petroleum Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Change In Inventory
Get a 7-Day Free Trial Premium Member Only Premium Member Only -76.11 -217.12 -77.03 -25.79 10.25

Occidental Petroleum Quarterly Data
Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26
Change In Inventory Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only 0.00 210.68 -193.40 -3.42 -22.49
HAM:OPC
63GF Score
Occidental Petroleum Corp HAM:OPC
Change In Inventory is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Occidental Petroleum Change In Inventory Calculation

Change In Inventory is the difference between last period's ending inventory and the current period's ending inventory.

Change In Inventory for the trailing twelve months (TTM) ended in Mar. 2026 adds up the quarterly data reported by the company within the most recent 12 months, which was €-9 Mil.

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Frequently Asked Questions Learn more about Change In Inventory →
What does a Change In Inventory of €-9 Mil mean?
Occidental Petroleum (HAM:OPC) has a Change In Inventory of €-9 Mil as of Mar. 2026. Change in Inventory is the difference between current-period inventory and past-period inventory. View historical data for Occidental Petroleum and its competitors.
Is Occidental Petroleum's Change In Inventory too high?
Occidental Petroleum's current Change In Inventory is €-9 Mil. Overall, Occidental Petroleum has a GF Score™ of 63/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Occidental Petroleum's Change In Inventory compare to FANG and DVN?
Occidental Petroleum's Change In Inventory of €-9 Mil can be compared against companies in the Oil & Gas industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Change In Inventory for an Oil & Gas company?
A good Change In Inventory depends on the Oil & Gas industry context. However, Change In Inventory should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Change In Inventory mean?
A high Change In Inventory can signal that a stock is expensive relative to its fundamentals. Change in Inventory is the difference between current-period inventory and past-period inventory. View historical data for Occidental Petroleum and its competitors. Occidental Petroleum's current Change In Inventory is €-9 Mil. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Occidental Petroleum stock overvalued right now?
Based on GuruFocus' analysis, Occidental Petroleum (HAM:OPC) is currently considered Modestly Overvalued. The stock's GF Value™ is €40.88, compared to a current price of €49.00 — trading 19.9% above its estimated fair value. The current Change In Inventory is €-9 Mil. Occidental Petroleum's overall GF Score™ is 63/100 with 2 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Change In Inventory calculated?
Change In Inventory is calculated from a company's financial statements. For Occidental Petroleum (HAM:OPC), the current Change In Inventory is €-9 Mil as of Mar. 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is Occidental Petroleum (HAM:OPC) Overvalued in 2026?

Based on GuruFocus' analysis, Occidental Petroleum stock appears to be overvalued. The current stock price of €49.00 is trading 19.9% above its estimated GF Value™ of €40.88. GuruFocus considers Occidental Petroleum to be Modestly Overvalued.

Key valuation signals for HAM:OPC:

  • Change In Inventory: €-9 Mil
  • GF Value™: €40.88 vs. price of €49.00 (19.9% above fair value)
  • GF Score™: 63/100 with 2 warning signs

No single metric tells the full story. See the HAM:OPC stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.

Occidental Petroleum Business Description

Industry EnergyOil & Gas
Address 5 Greenway Plaza, Suite 110, Houston, TX, USA, 77046
Occidental Petroleum is an independent exploration and production company with operations in the United States, Latin America, and the Middle East. At the end of 2025, the company reported net proved reserves of 4.6 billion barrels of oil equivalent. Net production averaged 1.4 million barrels of oil equivalent per day in 2025 at a ratio of roughly 74% oil and natural gas liquids and 26% natural gas.
63GF Score

Get the complete analysis for HAM:OPC

Change In Inventory is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

€49.00
Price
€40.88
GF Value