MKS Inc. (MKSI) ownership: Top institutional holder: BlackRock, Inc. ($1.53B). Insider activity: Net Seller (0 buys, 20 sells). 7 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 6641730.00 | $1.53B | 2026-03-31 |
| VANGUARD GROUP INC | 7487305.00 | $1.20B | 2025-12-31 |
| Invesco Ltd. | 3721459.00 | $855.23M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3685493.00 | $846.96M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3014201.00 | $692.69M | 2026-03-31 |
| STATE STREET CORP | 2057732.00 | $472.89M | 2026-03-31 |
| Capital International Investors | 1968770.00 | $452.44M | 2026-03-31 |
| FMR LLC | 1933843.00 | $444.42M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-10 | |
| Sell | null | 2026-06-05 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-06-01 | |
| Sell | null | 2026-05-27 | |
| Sell | null | 2026-05-27 | |
| Sell | null | 2026-05-27 | |
| Sell | null | 2026-05-27 |
Back to MKSI overview · MKSI earnings · All congressional trades
Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.