Introduction
The U.S. oil industry moves billions of dollars a year, yet leverage and falling prices can break even large producers. A bankruptcy filing doesn't always end a business. Many filers keep pumping oil through reorganization or sale.
"Biggest" is slippery. It can mean debt, liabilities, assets, or the damage to creditors, employees, regulators, and communities. This article focuses on U.S. exploration and production (E&P) companies and keeps oilfield services, midstream, refining, coal, and utilities separate.
Here is the catch: the public filings for the five candidates below report different measures, so a clean numeric ranking isn't defensible. We present them alphabetically, label every figure, and show you how to compare them properly.
Key Takeaways
- Compare cases on one measure, such as petition-date liabilities, and name the source.
- Chapter 11 aims at reorganization or sale; Chapter 7 means liquidation.
- Lenders, vendors, employees, and regulators all carry exposure in these cases.
- The largest filings are not always the major oil companies.
- Verify case status in court and restructuring records.
Overview of Oil-Company Bankruptcies in the United States
An oil-company bankruptcy means a U.S.-based exploration and production producer. Oilfield-services firms, pipelines, refiners, and utilities such as Energy Future Holdings (an electric services company) are excluded, as are international cases.
What Pushes Producers Under
Several pressures tend to stack up:
- Commodity-price swings that cut revenue overnight
- Heavy leverage and approaching debt maturities
- Production declines and lower reserve valuations
- Borrowing-base cuts on reserve-based loans
- Demand shocks, such as the 2020 collapse
The OCC notes that reserve-based loans are periodically re-evaluated, with the borrowing base normally reset every six months. In early 2020, 40 U.S. producers booked $48 billion in asset write-downs, EIA reported. Those are accounting impairments, not bankruptcy losses.
Chapter 11 vs. Chapter 7
In Chapter 11, the debtor usually proposes a plan to keep the business alive and repay creditors over time, though a liquidating plan is also allowed. The company can keep operating, sell assets, negotiate claims, or emerge with a new capital structure.
In Chapter 7, a trustee gathers and sells nonexempt assets and distributes the proceeds. There is no reorganization path for the going concern.
All five cases below were Chapter 11 filings.
Biggest Bankrupt Oil Companies in the United States
The measures differ by case. CRC reported aggregate indebtedness, Samson total liabilities, Whiting funded debt, and Chesapeake a debtor-in-possession (DIP) facility. Linn's cited filing gives no comparable total. Treat the dollar figures as labeled facts, not rank positions.
California Resources Corporation (CRC)
- Petition: July 15, 2020, Southern District of Texas, Chapter 11
- Figure: $5.24 billion aggregate outstanding indebtedness, per an SEC filing (not total liabilities)
- Outcome: Emerged October 27, 2020, with about $4.4 billion of loans and notes equitized
The case involved a parent and its subsidiaries, so the debt total shouldn't be read as a single-entity number without checking guarantees.
Chesapeake Energy Corporation
- Petition: June 28, 2020, Southern District of Texas, Chapter 11
- Figure: $925 million DIP facility (not petition-date total debt)
- Outcome: Emerged February 9, 2021, with about $7.8 billion of debt equitized
In October 2024, following its merger with Southwestern Energy, the company rebranded as Expand Energy and began trading under ticker EXE. The $7.8 billion measures what was converted to equity at emergence, not what was owed on the petition date.
LINN Energy, LLC and Affiliates
- Petition: May 11, 2016, Southern District of Texas, Chapter 11
- Debtor group: Linn Energy, LinnCo, subsidiaries, and Berry Petroleum Company
- Figure: No comparable petition-date total appears in the cited SEC filing
- Outcome: Plan confirmed; emergence effective February 28, 2017
Linn is a good example of why entity scope matters. The case covered a group of affiliated debtors, and adding their obligations together without checking schedules risks double counting.
Samson Resources Corporation
- Petition: September 16, 2015, District of Delaware, Chapter 11
- Figure: About $4.9 billion in total liabilities, including roughly $942 million of first-lien revolver obligations
- Outcome: Plan confirmation order entered February 13, 2017
Samson is the only candidate here with a total-liabilities figure from the first-day declaration. Total liabilities and funded debt are different things, so don't compare this number directly with Whiting's.
Whiting Petroleum Corporation
- Petition: April 1, 2020, Southern District of Texas, Chapter 11
- Business: Independent E&P focused on North Dakota and the Rocky Mountain region
- Figure: About $3.4 billion total funded debt as of the petition date
- Outcome: Combined with Oasis to form Chord Energy on July 1, 2022
The debtor group included Whiting Canadian Holding Company, so the filing wasn't purely U.S.-incorporated.
Why Rankings Can Shift
Order changes depending on whether you count debt, liabilities, assets, or inflation-adjusted values. The cited filings also don't establish company-specific plugging or environmental liability figures, so those amounts are not included in the comparisons above.
How We Chose the Biggest Bankrupt Oil Companies
A single numeric ranking is hard to defend. Haynes Boone's monitor covers North American producer cases and warns that a lead-case debt estimate can include affiliates and duplicate obligations. Its 2016 report counted 70 producer bankruptcies and about $56.8 billion in debt, but across Chapters 7, 11, and 15 and including Canada.
Verification Steps
- Confirm the legal entity and every affiliated debtor.
- Identify the chapter and petition date.
- Pull the petition-date figure and note its type (debt, liabilities, DIP).
- Check the latest confirmed outcome.
- Reconcile petitions, SEC filings, dockets, and trackers.
Common Comparison Errors
- Ranking by revenue instead of bankruptcy debt
- Confusing assets with liabilities
- Mixing U.S. and international cases
- Counting oilfield-services firms as producers
- Assuming a filing means operations stopped
Environmental and Regulatory Liabilities
Include environmental and regulatory liabilities only when court or agency records document them. BOEM's 2024 rule says more than 30 corporate bankruptcies since 2009 involved offshore lessees lacking sufficient financial assurance for decommissioning. That is agency-wide context, not a figure tied to any single company on this list.
For cross-checking filings, timelines, stakeholders, advisors, and outcomes, BankruptcyData can supplement primary court and company sources.
Conclusion
The biggest U.S. oil bankruptcies combine company-specific leverage with commodity, capital-market, and operational pressures. A headline debt number isn't enough. Check the filing date, legal entity, chapter, creditor structure, asset disposition, and confirmed outcome.
Legal, investment, and credit professionals should validate current developments through court and restructuring records. BankruptcyData, a U.S. bankruptcy intelligence provider founded in 1986, offers monitoring from first signals through final outcomes. Confirm the figures in this article against those primary records; they are not sourced from BankruptcyData.
Frequently Asked Questions
Which oil companies have gone bankrupt in the United States?
This article covers California Resources, Chesapeake Energy, Linn Energy, Samson Resources, and Whiting Petroleum. The list changes if you include oilfield-services, midstream, or refining companies.
Who are the 7 major oil companies?
The "Seven Sisters" is a historical grouping from the Library of Congress guide: Standard Oil of New Jersey, Standard Oil of New York, Standard Oil of California, Royal Dutch Shell, Texaco, Gulf, and Anglo-Persian. It's a separate classification from bankruptcy lists.
How is the biggest oil-company bankruptcy determined?
It depends on the measure: petition-date debt, total liabilities, assets, or inflation-adjusted values. Because the filings here report different measures, we present alphabetical candidates rather than a rank.
Does Chapter 11 mean an oil company is going out of business?
Not usually. Chapter 11 generally allows reorganization, continued operations, asset sales, or emergence under new ownership, though some cases convert to liquidation. All five companies above reorganized or combined.
What happens to oil wells and environmental obligations after a bankruptcy filing?
Obligations can remain subject to regulatory requirements, court orders, secured claims, or successor responsibilities. Outcomes depend on jurisdiction, case documents, and environmental law. Midlantic National Bank v. NJDEP (1986) limits a trustee's ability to abandon property in violation of protective state environmental laws.
