KMI vs WMB
Kinder Morgan, Inc. (KMI) and Williams Companies, Inc. (WMB) are both filed with the SEC under Natural Gas Transmission. WMB is 1.3× KMI's size by market cap ($90.7B against $70.2B); WMB trades at the higher fiscal-year P/E (34.7× against 23.0×); WMB reports the higher net margin (21.9% against 18.0%); WMB grew sales faster over three years (+2.9% against -4.1%); and over the past year WMB returned +31.2% against KMI's +21.5%.
| KMI | WMB | |
|---|---|---|
| Last close | $31.56 | $73.73 |
| Market cap | $70.2B | $90.7B |
| P/E (FY) | 23.0× | 34.7× |
| P/S | 4.1× | 7.6× |
| EV/EBITDA | 14.2× | — |
| Operating margin | 27.9% | 35.1% |
| Net margin | 18.0% | 21.9% |
| Return on equity | 9.9% | 20.7% |
| Sales growth (3y) | -4.1% | +2.9% |
| EPS growth (3y) | +6.9% | +8.6% |
| Dividend yield | 3.7% | 2.7% |
| 1-year return | +21.5% | +31.2% |
Screener snapshot — prices as of 2026-08-28. Each side's last close is the most recent session the snapshot holds for that company, which can be an earlier one, and its 1-year return is measured to that close. Market caps struck on 2026-08-27. Last close, market cap and the 1-year return are price figures; every other row is computed over the company's latest filed fiscal year — FY2025 (ended 2025-12-31) for both. — not published for this company. A ratio goes unpublished for more than one reason: a component the calculation needs is not on file, the filing does not tag the line it is read from, or the calculation is not defined on the filed basis — EV/EBITDA is not printed on non-positive EBITDA, and return on equity is not computed on a zero or negative equity base.
Who holds them, and who has traded them
| KMI | WMB | |
|---|---|---|
| Institutional holders (13F) | 1,812 | 1,796 |
| Insider buyers − sellers (180d) | -2 | -5 |
| Congressional trades disclosed (180d) | 1 | 2 |
| Executive-branch officials on file — trades disclosed (180d) | 5 | 5 |
Counts only. The congressional figures count transactions dated in the trailing 180 days and disclosed in STOCK Act periodic transaction reports; amounts are filed as ranges and are never summed. The executive-branch figures count the same window of transactions, and they are scoped to one roster. The officials OGE posts for direct download. Insider buyers − sellers counts distinct people filing open-market Form 4 purchases minus distinct people filing open-market sales over the trailing 180 days, capped at ±5.
KMI vs WMB: common questions
- Is KMI bigger than WMB?
- WMB carries the larger market cap — $90.7B against $70.2B, both struck on 2026-08-27.
- Which trades at a higher P/E, KMI or WMB?
- WMB, at a fiscal-year 34.7× against 23.0× for KMI. Both are price ÷ latest full-year diluted earnings per share, not a trailing-twelve-month P/E.
- How have KMI and WMB performed over the past year?
- WMB returned +31.2% and KMI +21.5%, measured on the trailing calendar year to the last close.
- How many institutions hold KMI and WMB?
- 1,812 13F filers report a position in KMI and 1,796 in WMB, on the latest quarter in the panel.
- Are KMI and WMB in the same industry?
- Both are filed with the SEC under Natural Gas Transmission, which is the classification this pairing is built on.
KMI overview → · WMB overview → · KMI institutional ownership → · WMB institutional ownership → · Congress and KMI → · Congress and WMB → · Executive branch and KMI → · Executive branch and WMB →
More in Natural Gas Transmission: DTM vs KMI · DTM vs TRGP · DTM vs WMB · KMI vs TRGP
Stock comparisons lists every pair this site publishes.
Source: SPZCO — https://spzco.com/vs/kmi-vs-wmb