Capital Research Global Investors
· Reduced
Change
−1.1M
Δ Own
−58.3%
Date
Q1 2026
MT
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Capital Research Global Investors
· Reduced
Change
−1.1M
Δ Own
−58.3%
Date
Q1 2026
|
Capital Research Global Investors | Reduced· Q1 2026 | – | −1.1M | −58.3% | Q1 2026 | |||||
|
Capital World Investors
· New
Change
+415K
Date
Q1 2026
|
Capital World Investors | New· Q1 2026 | – | +415K | – | Q1 2026 | |||||
|
American Century Companies Inc
· Added
Change
+361K
Date
Q1 2026
|
American Century Companies Inc | Added· Q1 2026 | – | +361K | – | Q1 2026 | |||||
|
Fisher Asset Management, LLC
· Added
Change
+302K
Δ Own
+215.1%
Date
Q1 2026
|
Fisher Asset Management, LLC | Added· Q1 2026 | – | +302K | +215.1% | Q1 2026 | |||||
|
Trigran Investments, Inc.
· Reduced
Change
−124K
Date
Q1 2026
|
Trigran Investments, Inc. | Reduced· Q1 2026 | – | −124K | – | Q1 2026 | |||||
|
State Street
· Added
Change
+119K
Date
Q1 2026
|
State Street | Added· Q1 2026 | – | +119K | – | Q1 2026 | |||||
|
Dimensional
· Reduced
Change
−106K
Date
Q1 2026
|
Dimensional | Reduced· Q1 2026 | – | −106K | – | Q1 2026 | |||||
|
Invesco Ltd.
· Added
Change
+105K
Δ Own
+142.7%
Date
Q1 2026
|
Invesco Ltd. | Added· Q1 2026 | – | +105K | +142.7% | Q1 2026 | |||||
|
Vanguard
· Added
Change
+100K
Date
Q1 2026
|
Vanguard | Added· Q1 2026 | – | +100K | – | Q1 2026 | |||||
|
Ceredex Value Advisors LLC
· New
Change
+98K
Date
Q1 2026
|
Ceredex Value Advisors LLC | New· Q1 2026 | – | +98K | – | Q1 2026 | |||||
|
Nuveen, LLC
· Added
Change
+74K
Date
Q1 2026
|
Nuveen, LLC | Added· Q1 2026 | – | +74K | – | Q1 2026 | |||||
|
BlackRock
· Added
Change
+68K
Date
Q1 2026
|
BlackRock | Added· Q1 2026 | – | +68K | – | Q1 2026 | |||||
|
Qube Research & Technologies Ltd
· New
Change
+65K
Date
Q1 2026
|
Qube Research & Technologies Ltd | New· Q1 2026 | – | +65K | – | Q1 2026 | |||||
|
Intech Investment Management LLC
· Reduced
Change
−60K
Date
Q1 2026
|
Intech Investment Management LLC | Reduced· Q1 2026 | – | −60K | – | Q1 2026 | |||||
|
Concentric Capital Strategies, LP
· Reduced
Change
−51K
Date
Q1 2026
|
Concentric Capital Strategies, LP | Reduced· Q1 2026 | – | −51K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Prevost Patrick M.
· Director
Grant (A)
$21K
|
Prevost Patrick M. | Director | Grant (A) | $253.27 | 81 | $21K | 18K | +0.4% | Jul 15, 2026 | Jul 16, 2026 | |||||||||
|
Shular Craig S.
· Director
Grant (A)
$24K
|
Shular Craig S. | Director | Grant (A) | $253.27 | 96 | $24K | 55K | +0.2% | Jul 15, 2026 | Jul 16, 2026 | |||||||||
|
Fashinpaur Melissa A.
· Officer
Grant (A)
1
|
Fashinpaur Melissa A. | Officer | Grant (A) | – | 1 | – | 2K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Chadwick Shelly Marie
· Officer
Grant (A)
8
|
Chadwick Shelly Marie | Officer | Grant (A) | – | 8 | – | 12K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Prevost Patrick M.
· Director
Grant (A)
9
|
Prevost Patrick M. | Director | Grant (A) | – | 9 | – | 18K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Liggett Emily M.
· Director
Grant (A)
1
|
Liggett Emily M. | Director | Grant (A) | – | 1 | – | 1K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Vijayvargiya Jugal K.
· Director
Grant (A)
11
|
Vijayvargiya Jugal K. | Director | Grant (A) | – | 11 | – | 19K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Phillippy Robert J.
· Director
Grant (A)
7
|
Phillippy Robert J. | Director | Grant (A) | – | 7 | – | 12K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Chemnitz Gregory R.
· Officer
Grant (A)
2
|
Chemnitz Gregory R. | Officer | Grant (A) | – | 2 | – | 4K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Khilnani Vinod M.
· Director
Grant (A)
12
|
Khilnani Vinod M. | Director | Grant (A) | – | 12 | – | 20K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Shular Craig S.
· Director
Grant (A)
31
|
Shular Craig S. | Director | Grant (A) | – | 31 | – | 55K | – | Jun 12, 2026 | Jun 16, 2026 | |||||||||
|
Phillippy Robert J.
· Director
4 operations
−$765K
|
Phillippy Robert J. | Director | 4 operations | $217.67–$220.30 | −4K | −$765K | 4K | – | May 29, 2026 | Jun 1, 2026 | |||||||||
|
Khilnani Vinod M.
· Director
4 operations
−$517K
|
Khilnani Vinod M. | Director | 4 operations | $205.32–$208.74 | −2K | −$517K | 13K | – | May 13, 2026 | May 15, 2026 | |||||||||
|
Vijayvargiya Jugal K.
· Director
2 operations
0
|
Vijayvargiya Jugal K. | Director | 2 operations | $50.95 | 0 | – | 0 | – | May 13, 2026 | May 15, 2026 | |||||||||
|
Vijayvargiya Jugal K.
· Director
Tax withholding or exercise payment (F)
-$3.2M
|
Vijayvargiya Jugal K. | Director | Tax withholding or exercise payment (F) | $209.70 | -15K | -$3.2M | 130K | – | May 13, 2026 | May 15, 2026 | |||||||||
A
N
M
G
A
A
290 reporting institutions disclosed MTRN position changes in the Q1 2026 snapshot.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.