The short version

From the latest prices and each company's SEC filings. Who's ahead on each measure, not which to buy.

  • Occidental Petroleum is the larger company, worth $62.6B, close to Diamondback Energy's $54.3B.
  • Occidental Petroleum grew revenue faster over the last year (+53.4% vs +51.2%).
  • On earnings, Occidental Petroleum is the cheaper stock (85.1x vs 197.0x).

Side by side

The stronger figure is shaded where higher (or, for valuation multiples, lower) reads as better. How the implied growth works.

MeasureFANGOXY
Market cap$54.3B$62.6B
Share price$192.13$60.11
Revenue (last fiscal year)$15.0B$21.6B
Free cash flow (last fiscal year)—$4.1B
Revenue growth, last year+51.2%+53.4%
Revenue growth per year, last 5 fiscal years+22.2%-4.5%
Operating margin6.3%—
Net margin8.6%33.7%
Return on equity3.9%17.5%
P/E (trailing)197.0x85.1x
Price / free cash flow10.4x15.2x
EV / EBITDA9.60x6.11x
FCF growth the price implies—1.4%
Dividend yield2.1%1.6%
Debt / equity0.69x0.91x
Fundamental gradeCB
Superinvestors holding it98
Insider purchases, last 12 months04

Results from SEC filings

Revenue and free cash flow by fiscal year, from each company's 10-K filings.

Diamondback Energy

YearRevenueFree cash flowOp. margin
2021$6.7B—59.3%
2022$9.6B—68.0%
2023$8.4B—54.3%
2024$11.1B—39.7%
2025$15.0B—8.4%

Occidental Petroleum

YearRevenueFree cash flowOp. margin
2021$26.0B$7.6B—
2022$36.6B$12.3B—
2023$23.2B$6.6B—
2024$22.0B$5.2B—
2025$21.6B$4.1B—

Where the revenue comes from

Diamondback Energy · by segments, 2023

Upstream$8.3B99%
All Other$68M1%

Occidental Petroleum · by segments, 2025

Oil and gas$20.9B94%
Midstream and marketing$1.3B6%
Compare them in fullFifteen years of statements, quarterly results, DCF and IRR models, and any number of peers side by side.
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Questions

Which is bigger, Diamondback Energy or Occidental Petroleum?

Occidental Petroleum (OXY), at $62.6B against $54.3B.

Is FANG or OXY cheaper?

By trailing P/E, Occidental Petroleum (85.1x) is cheaper than Diamondback Energy (197.0x). A lower multiple can also mean the market expects less growth.

Which grows faster, FANG or OXY?

Occidental Petroleum: revenue grew +53.4% over the last year, against +51.2%.

Prices and ratios as of the last daily update; statements from SEC filings. Information only, not investment advice.