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Below is a table of the PSX market cap history going back to 4/30/2012:
Also see: PSX Shares Outstanding History and PSX YTD Return |
PSX Market Cap History — Phillips 66 Capitalization Over Time
As of 6/30/2026 Phillips 66 has a market cap of 67.45 billion. Investors often follow the PSX market cap history to compare the size of the company over time.
This page shows PSX market capitalization trends over time, with 58 market cap datapoints presented, dating back to 4/30/2012.
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PSX Historical Market Cap: +8.48% CAGR 
Mouse over chart for data details
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| PSX Stock Price Chart |
| About Phillips 66 |
| Phillips 66 is a diversified and integrated downstream energy provider that manufactures, transports and markets products that drive the global economy. Co.'s Midstream segment provides crude oil and refined petroleum product transportation, terminating and processing services, as well as natural gas and natural gas liquids (NGL) transportation, storage, fractionation, gathering, processing and marketing services, mainly in the U.S.. Its Chemicals segment consists of its 50% equity investment in Chevron Phillips Chemical Co. LLC, which manufactures and markets petrochemicals and plastics on a worldwide basis. We show 58 historical shares outstanding datapoints in our PSX shares outstanding history coverage, used to compute PSX market cap on those dates. Understanding the changing numbers of shares outstanding, the changing share price, and the resulting changing PSX market cap history over the course of time is important for investors interested in comparing PSX's market cap history versus its peers. Many "beginner" or "novice" investors will look at one stock trading at a price of $10 per share and another trading at a price of $20 per share and think the latter company is worth twice as much. Of course, that is a completely meaningless comparison without also knowing how many shares outstanding there are for each of the two companies, and then calculating their respective market caps. Comparing the share price of PSX versus a peer is one thing; comparing PSX market cap versus a peer is a completely different story. Furthermore, via fluctuation both in per-share price and in the number of shares outstanding (via issuance of new shares over time, the repurchase of existing shares), the market cap for a company like PSX can fluctuate over the course of history. With this page we aim to empower investors researching PSX by allowing them to research the PSX market cap history. |
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| Video: The Importance of Market Cap | |
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Video: The Importance of Market Cap
| PSX Share Performance |
| Market Cap Peers |
| Phillips 66 (PSX) is categorized under the Energy sector; to help you further research historical market cap numbers, below are some other companies in the same sector:
PSXP Market Cap History PTEN Market Cap History PUMP Market Cap History PVAC Market Cap History PXD Market Cap History QEP Market Cap History QES Market Cap History RCON Market Cap History RDC Market Cap History REN Market Cap History More Energy companies » |
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