Ticker · CUSIP 574599106
Holders (tracked)
12
Combined shares
22,626,503
Combined value
$1.42B
Last close
$63.73
Quarter
2025Q4
Tracked holders · last 8 quarters
-3 vs previous quarter over the last 8.
Price is +1.8% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
28 events
- AQR Capital Management trimmed2026-02-17−84,707 shares · 2025Q413F
- D.E. Shaw & Co. trimmed2026-02-17−89,440 shares · 2025Q413F
- Two Sigma Investments trimmed2026-02-17−13,642 shares · 2025Q413F
- Steve Cohen (Point72) exited2026-02-17−1,339,189 shares · 2025Q413F
- T. Rowe Price trimmed2026-02-17−2,317 shares · 2025Q413F
- Wellington Management added2026-02-17+2,085,454 shares · 2025Q413F
- Bill Nygren (Harris / Oakmark) added2026-02-17+4,090,719 shares · 2025Q413F
- Ken Griffin (Citadel Advisors) added2026-02-17+18,569 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) added2026-02-17+421,113 shares · 2025Q413F
- −37,662 shares · 2025Q413F
- John Rogers (Ariel Investments) added2026-02-13+6,776 shares · 2025Q413F
- Renaissance Technologies added2026-02-12+571,500 shares · 2025Q413F
- Norges Bank (Norway SWF) opened position2026-02-10+3,069,935 shares · 2025Q413F
- Ken Fisher (Fisher Asset Mgmt) exited2026-02-09−4,464 shares · 2025Q413F
- AQR Capital Management added2025-11-14+74,971 shares · 2025Q313F
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−2,039,026 shares · 2025Q313F
- Steve Cohen (Point72) trimmed2025-11-14−530,606 shares · 2025Q313F
- Two Sigma Investments trimmed2025-11-14−8,722 shares · 2025Q313F
- D.E. Shaw & Co. trimmed2025-11-14−392,413 shares · 2025Q313F
- T. Rowe Price added2025-11-14+770 shares · 2025Q313F
- Wellington Management opened position2025-11-14+2,741,130 shares · 2025Q313F
- Bill Nygren (Harris / Oakmark) added2025-11-14+94,647 shares · 2025Q313F
- John Rogers (Ariel Investments) trimmed2025-11-14−3,212 shares · 2025Q313F
- Renaissance Technologies trimmed2025-11-13−174,300 shares · 2025Q313F
- Norges Bank (Norway SWF) exited2025-11-13−1,910,972 shares · 2025Q313F
- +37,662 shares · 2025Q313F
- Norges Bank (Norway SWF) added2025-11-12+500,240 shares · 2024Q313F
- +4,464 shares · 2025Q313F
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of MAS…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| T. Rowe Price | 2016Q1 | $29.91 | +113.1% | $19.8M |
| John Rogers (Ariel Investments) | 2018Q4 | $45.19 | +41.0% | $25.8M |
| Bill Nygren (Harris / Oakmark) | 2018Q4 | $52.36 | +21.7% | $733.0M |
| Renaissance Technologies | 2016Q1 | $53.65 | +18.8% | $56.8M |
| AQR Capital Management | 2016Q1 | $59.81 | +6.5% | $50.4M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $63.74 | -0.0% | $28.7M |
| Ken Griffin (Citadel Advisors) | 2016Q1 | $63.95 | -0.4% | $1.8M |
| Ken Griffin (Citadel Advisors) | 2016Q1 | $63.95 | -0.4% | $1.8M |
| Two Sigma Investments | 2016Q1 | $66.21 | -3.7% | $2.2M |
| Wellington Management | 2016Q1 | $67.36 | -5.4% | $307.6M |
| D.E. Shaw & Co. | 2016Q1 | $68.43 | -6.9% | $957K |
| Norges Bank (Norway SWF) | 2016Q1 | $243.09 | -73.8% | $195.6M |
Who moved on this name in 2025Q4
13F transactions reported for the latest quarter, grouped by direction.
New positions1
- Norges Bank (Norway SWF)+3,069,935$194.8M
Added to6
- Bill Nygren (Harris / Oakmark)+4,090,719$259.6M
- Wellington Management+2,085,454$132.3M
- Renaissance Technologies+571,500$36.3M
- Izzy Englander (Millennium Mgmt)+421,113$26.7M
- Ken Griffin (Citadel Advisors)+18,569$1.2M
- John Rogers (Ariel Investments)+6,776$430K
Trimmed4
- D.E. Shaw & Co.−89,440$5.7M
- AQR Capital Management−84,707$5.4M
- Two Sigma Investments−13,642$866K
- T. Rowe Price−2,317$147
Exited3
- Steve Cohen (Point72)−1,339,189$94.3M
- Ray Dalio (Bridgewater Associates)−37,662$2.7M
- Ken Fisher (Fisher Asset Mgmt)−4,464$314K
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 17 | $115.57B |
| 2022Q2 | 14 | $116.83B |
| 2022Q3 | 15 | $82.3M |
| 2022Q4 | 16 | $1.37B |
| 2023Q1 | 14 | $1.47B |
| 2023Q2 | 13 | $1.82B |
| 2023Q3 | 17 | $1.65B |
| 2023Q4 | 16 | $2.10B |
| 2024Q1 | 15 | $2.44B |
| 2024Q2 | 15 | $1.88B |
| 2024Q3 | 15 | $939.6M |
| 2024Q4 | 13 | $817.1M |
| 2025Q1 | 14 | $781.9M |
| 2025Q2 | 14 | $1.11B |
| 2025Q3 | 15 | $959.1M |
| 2025Q4 | 12 | $1.42B |
Congress members trading this stock
| Date | Member | Type | Amount range | Filing |
|---|---|---|---|---|
| 2025-04-07 | Julie Johnson | Sell | $1K – $15K | PDF ↗ |
Who owns MAS
12 super-investors · 2025Q4
Tracked stake
22.63M
shares
Combined value
$1.42B
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added7Trim4
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Bill Nygren Harris / Oakmark | 11.50M | $730M |
| 2 | Wellington Management | 4.83M | $306M |
| 3 | Norges Bank Norway SWF | 3.07M | $195M |
| 4 | Renaissance Technologies | 892.0K | $57M |
| 5 | AQR Capital Management | 790.8K | $50M |
| 6 | Izzy Englander Millennium Mgmt | 450.0K | $29M |
| 7 | John Rogers Ariel Investments | 405.5K | $26M |
| 8 | Ken Griffin Citadel Advisors | 301.9K | $19M |
| 9 | Two Sigma Investments | 34.0K | $2M |
| 10 | Ken Griffin Citadel Advisors | 28.9K | $2M |
| 11 | D.E. Shaw & Co. | 15.0K | $953K |
| 12 | T. Rowe Price | 310.0K | $20K |
Recent moves
20 transactions
- +4,090,719 · 2025Q4
- −1,339,189 · 2025Q4
- TRIMT. Rowe Price−2,317 · 2025Q4
- +421,113 · 2025Q4
- TRIMD.E. Shaw & Co.−89,440 · 2025Q4
- −84,707 · 2025Q4
- +2,085,454 · 2025Q4
- +18,569 · 2025Q4
- −13,642 · 2025Q4
- +6,776 · 2025Q4
- −37,662 · 2025Q4
- +571,500 · 2025Q4
- +3,069,935 · 2025Q4
- −4,464 · 2025Q4
- −2,039,026 · 2025Q3
- −530,606 · 2025Q3
- −8,722 · 2025Q3
- TRIMD.E. Shaw & Co.−392,413 · 2025Q3
- +770 · 2025Q3
- +2,741,130 · 2025Q3
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