Stocks › MASI
MASI
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MASI
MASI
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
MASIS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
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Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of MASI by members of U.S. Congress · 12 on record · 1 in the last 12 months
| Politician | Stock | Type | Filed | Traded | |
|---|---|---|---|---|---|
 Kevin HernHouse · R · OK |
MASIMASI · Stock |
Sale $15,001 - $50,000 |
Oct 16, 2025 | Sep 26, 2025 | Filing ↗ |
| Kevin HernHouse · R · OK |
MASIMASI · Stock |
Sale $50,001 - $100,000 |
Jan 13, 2023 | Dec 19, 2022 | Filing ↗ |
 Tommy TubervilleSenate · R · AL |
MASIMASI · Stock |
Sale $1,001 - $15,000 |
Nov 10, 2022 | Oct 5, 2022 | Filing ↗ |
 Ro KhannaHouse · D · CA |
MASIMASI · Common Stock |
Purchase $1,001 - $15,000 |
Jun 10, 2022 | May 23, 2022 | Filing ↗ |
| Tommy TubervilleSenate · R · AL |
MASIMASI · Stock |
Purchase $1,001 - $15,000 |
Apr 8, 2022 | Mar 30, 2022 | Filing ↗ |
| Kevin HernHouse · R · OK |
MASIMASI · Stock |
Purchase $15,001 - $50,000 |
Jul 14, 2021 | Jun 25, 2021 | Filing ↗ |
| Kevin HernHouse · R · OK |
MASIMASI · Stock |
Purchase $100,001 - $250,000 |
Jul 14, 2021 | Jun 25, 2021 | Filing ↗ |
 James B. RenacciHouse · R · OH |
MASIMASI · Stock |
Sale $1,001 - $15,000 |
Mar 18, 2015 | Mar 6, 2015 | Filing ↗ |
| James B. RenacciHouse · R · OH |
MASIMASI · Stock |
Purchase $1,001 - $15,000 |
Mar 4, 2015 | Feb 20, 2015 | Filing ↗ |
 Thom TillisSenate · R · NC |
MASIMASI · Stock |
Sale $1,001 - $15,000 |
Feb 26, 2015 | Feb 13, 2015 | Filing ↗ |
| James B. RenacciHouse · R · OH |
MASIMASI · Stock |
Purchase $1,001 - $15,000 |
Aug 6, 2014 | Jul 24, 2014 | Filing ↗ |
| James B. RenacciHouse · R · OH |
MASIMASI · Stock |
Purchase $1,001 - $15,000 |
Apr 8, 2014 | Mar 24, 2014 | Filing ↗ |
Whale Activity
Position changes in MASI reported for 2026-06-30 by 9 tracked institutional filers
- Increased0
- New0
- Held0
- Decreased0
- Closed9
- No prior filing0
| Filer | Shares | Value | Change |
|---|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0 | $0 | closed |
| VANGUARD CAPITAL MANAGEMENT LLC | 0 | $0 | closed |
| BlackRock, Inc. | 0 | $0 | closed |
| Citadel Advisors LLC | 0 | $0 | closed |
| Bridgewater Associates | 0 | $0 | closed |
| Millennium Management LLC | 0 | $0 | closed |
| HARVEST MANAGEMENT LLC | 0 | $0 | closed |
| Renaissance Technologies | 0 | $0 | closed |
| D. E. Shaw & Co., Inc. | 0 | $0 | closed |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by MASI insiders, by quarter · Form 4
Recent Insider Transactions
1,094 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| Solomon Darlene J. S.Director | Disposition to issuer | −3,015 | $180.00 | $543K | Jun 10, 2026 | Form 4 ↗ |
| Scannell Timothy JDirector | Disposition to issuer | −2,608 | $180.00 | $469K | Jun 10, 2026 | Form 4 ↗ |
| LANE WENDY EDirector | Disposition to issuer | −2,608 | $180.00 | $469K | Jun 10, 2026 | Form 4 ↗ |
| Politan Capital Management GP LLC | Disposition to issuer | −4.6M | $180.00 | $826.4M | Jun 10, 2026 | Form 4 ↗ |
| Brennan MichelleDirector | Disposition to issuer | −9,309 | $180.00 | $1.7M | Jun 10, 2026 | Form 4 ↗ |
| Hataishi PaulSVP, Chief Accounting Officer | Disposition to issuer | −13.3K | $180.00 | $2.4M | Jun 10, 2026 | Form 4 ↗ |
| Sampath AnandEVP, Operations | Disposition to issuer | −33.9K | $180.00 | $6.1M | Jun 10, 2026 | Form 4 ↗ |
| Hellmann Elisabeth AChief Human Resources Officer | Disposition to issuer | −214 | $180.00 | $39K | Jun 10, 2026 | Form 4 ↗ |
| Young Micah WEVP, Chief Financial Officer | Disposition to issuer | −25.7K | $180.00 | $4.6M | Jun 10, 2026 | Form 4 ↗ |
| Szyman Catherine M.Chief Executive Officer · Director | Disposition to issuer | −7,605 | $180.00 | $1.4M | Jun 10, 2026 | Form 4 ↗ |
| Scannell Timothy JDirector | Option exercise | +1,225 | $0.00 | $0 | Apr 29, 2026 | Form 4 ↗ |
| LANE WENDY EDirector | Option exercise | +1,225 | $0.00 | $0 | Apr 29, 2026 | Form 4 ↗ |
| Brennan MichelleDirector | Option exercise | +1,225 | $0.00 | $0 | Apr 29, 2026 | Form 4 ↗ |
| Hellmann Elisabeth AChief Human Resources Officer | Tax withholding | −121 | $178.43 | $22K | Apr 21, 2026 | Form 4 ↗ |
| Hellmann Elisabeth AChief Human Resources Officer | Option exercise | +335 | $0.00 | $0 | Apr 21, 2026 | Form 4 ↗ |
| Szyman Catherine M.CEO · Director | Tax withholding | −1,069 | $175.47 | $188K | Mar 11, 2026 | Form 4 ↗ |
| Szyman Catherine M.CEO · Director | Option exercise | +2,101 | $0.00 | $0 | Mar 11, 2026 | Form 4 ↗ |
| Young Micah WEVP & Chief Financial Officer | Tax withholding | −471 | $175.47 | $83K | Mar 11, 2026 | Form 4 ↗ |
| Young Micah WEVP & Chief Financial Officer | Option exercise | +873 | $0.00 | $0 | Mar 11, 2026 | Form 4 ↗ |
| Young Micah WEVP & Chief Financial Officer | Tax withholding | −8,093 | $175.35 | $1.4M | Feb 27, 2026 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding MASI · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| MFS Mid Cap Growth Fund MFS Series Trust IV | 1.6M | $291.9M | 2.12% | May 31, 2026 |
| iShares Core S&P Mid-Cap ETF iSHARES TRUST | 1.5M | $268.9M | 0.25% | Mar 31, 2026 |
| VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS | 1.5M | $258.3M | 0.01% | Mar 31, 2026 |
| VANGUARD SMALL-CAP INDEX FUND VANGUARD INDEX FUNDS | 1.1M | $187.3M | 0.11% | Mar 31, 2026 |
| VANGUARD SMALL-CAP GROWTH INDEX FUND VANGUARD INDEX FUNDS | 589.6K | $104.9M | 0.27% | Mar 31, 2026 |
| VANGUARD EXTENDED MARKET INDEX FUND VANGUARD INDEX FUNDS | 509.9K | $90.7M | 0.11% | Mar 31, 2026 |
| First Trust Merger Arbitrage Fund Investment Managers Series Trust II | 402.1K | $71.5M | 4.53% | Mar 31, 2026 |
| State Street SPDR S&P MidCap 400SM ETF Trust SPDR S&P MIDCAP 400 ETF TRUST (MDY) | 344.1K | $61.2M | 0.25% | Mar 31, 2026 |
| Fidelity Mid-Cap Stock Fund Fidelity Concord Street Trust | 321.7K | $57.4M | 0.66% | Apr 30, 2026 |
| SMALLCAP World Fund Inc | 317.3K | $56.4M | 0.07% | Mar 31, 2026 |
Mutual funds and ETFs whose N-PORT filings list MASI's shares (CUSIP 574795100), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Activist & Passive Stakes
Schedule 13D / 13G beneficial-ownership filings
- Quentin KoffeySCHEDULE 13D/A · activist (13D) · 0 shares0.0%
Jun 11, 2026 · ↗ - Politan Capital Partners GP LLCSCHEDULE 13D/A · activist (13D) · 0 shares0.0%
Jun 11, 2026 · ↗ - Politan Capital Management GP LLCSCHEDULE 13D/A · activist (13D) · 0 shares0.0%
Jun 11, 2026 · ↗ - Politan Capital Management LPSCHEDULE 13D/A · activist (13D) · 0 shares0.0%
Jun 11, 2026 · ↗ - Matthew HalbowerSCHEDULE 13G · passive (13G) · 3.2M shares6.1%
May 15, 2026 · ↗ - Pentwater Capital Management LPSCHEDULE 13G · passive (13G) · 3.2M shares6.1%
May 15, 2026 · ↗ - Joe KianiSCHEDULE 13G/A · passive (13G) · 3.7M shares6.5%
May 14, 2026 · ↗ - Barclays PLCSCHEDULE 13G · passive (13G) · 2.9M shares5.5%
May 14, 2026 · ↗
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming MASI as client
No lobbying filings found naming MASI as the client.
Government Contracts
Federal awards to MASI · USAspending
No federal contract awards found for MASI.
U.S. Patents
Recent USPTO applications naming MASI
No USPTO patent applications found for MASI.
Annual Financials
From MASI's 10-K filings · XBRL
No annual XBRL figures on record for MASI. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
No price history on record for MASI.
About MASI
From SEC EDGAR company records
No company profile on record.