AME vs MKSI
Ametek Inc/ (AME) and Mks Inc (MKSI) are both filed with the SEC under Industrial Instruments For Measurement, Display, and Control. AME is 3.0× MKSI's size by market cap ($55.9B against $18.3B); MKSI trades at the higher fiscal-year P/E (62.0× against 38.1×); AME reports the higher net margin (20.0% against 7.5%); AME grew sales faster over three years (+6.4% against +3.5%); and over the past year MKSI returned +138.6% against AME's +27.1%.
| AME | MKSI | |
|---|---|---|
| Last close | $236.25 | $255.76 |
| Market cap | $55.9B | $18.3B |
| P/E (FY) | 38.1× | 62.0× |
| P/S | 7.5× | 4.7× |
| EV/EBITDA | 24.7× | 25.3× |
| Gross margin | — | 46.7% |
| Operating margin | 25.8% | 13.4% |
| Net margin | 20.0% | 7.5% |
| Return on equity | 14.6% | 11.7% |
| Sales growth (3y) | +6.4% | +3.5% |
| EPS growth (3y) | +8.5% | -7.7% |
| Dividend yield | 0.5% | 0.3% |
| 1-year return | +27.1% | +138.6% |
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 A ratio goes unpublished for more than one reason: a component the calculation needs is not on file, the filing does not tag the line it is read from, or the calculation is not defined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
| AME | MKSI | |
|---|---|---|
| Institutional holders (13F) | 1,150 | 615 |
| Insider buyers − sellers (180d) | -1 | -5 |
| Congressional trades disclosed (180d) | 1 | 0 |
| Executive-branch officials on file — trades disclosed (180d) | 2 | 0 |
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.
AME vs MKSI: common questions
- Is AME bigger than MKSI?
- AME carries the larger market cap — $55.9B against $18.3B, both struck on 2026-08-27.
- Which trades at a higher P/E, AME or MKSI?
- MKSI, at a fiscal-year 62.0× against 38.1× for AME. Both are price ÷ latest full-year diluted earnings per share, not a trailing-twelve-month P/E.
- How have AME and MKSI performed over the past year?
- MKSI returned +138.6% and AME +27.1%, measured on the trailing calendar year to the last close.
- How many institutions hold AME and MKSI?
- 1,150 13F filers report a position in AME and 615 in MKSI, on the latest quarter in the panel.
- Are AME and MKSI in the same industry?
- Both are filed with the SEC under Industrial Instruments For Measurement, Display, and Control, which is the classification this pairing is built on.
AME overview → · MKSI overview → · AME institutional ownership → · MKSI institutional ownership → · Congress and AME → · Executive branch and AME →
More in Industrial Instruments For Measurement, Display, and Control: AME vs DHR · AME vs FTV · AME vs KEYS · AME vs ROP
Stock comparisons lists every pair this site publishes.
Source: SPZCO — https://spzco.com/vs/ame-vs-mksi