Geneva Capital Management LLC
· Exited
Change
−1.9M
Δ Own
−100.0%
Date
Q1 2026
MR
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Geneva Capital Management LLC
· Exited
Change
−1.9M
Δ Own
−100.0%
Date
Q1 2026
|
Geneva Capital Management LLC | Exited· Q1 2026 | – | −1.9M | −100.0% | Q1 2026 | |||||
|
Nuance Investments, LLC
· Reduced
Change
−1.5M
Date
Q1 2026
|
Nuance Investments, LLC | Reduced· Q1 2026 | – | −1.5M | – | Q1 2026 | |||||
|
FMR LLC
· Added
Change
+1.1M
Δ Own
+167.7%
Date
Q1 2026
|
FMR LLC | Added· Q1 2026 | – | +1.1M | +167.7% | Q1 2026 | |||||
|
Boston Partners
· Added
Change
+780K
Date
Q1 2026
|
Boston Partners | Added· Q1 2026 | – | +780K | – | Q1 2026 | |||||
|
Royce & Associates LP
· Added
Change
+700K
Date
Q1 2026
|
Royce & Associates LP | Added· Q1 2026 | – | +700K | – | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
Change
−601K
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | – | −601K | −100.0% | Q1 2026 | |||||
|
Two Sigma Investments, LP
· Added
Change
+567K
Δ Own
+65.8%
Date
Q1 2026
|
Two Sigma Investments, LP | Added· Q1 2026 | – | +567K | +65.8% | Q1 2026 | |||||
|
Next Century Growth Investors LLC
· New
Change
+418K
Date
Q1 2026
|
Next Century Growth Investors LLC | New· Q1 2026 | – | +418K | – | Q1 2026 | |||||
|
4d Advisors, LLC
· New
Change
+350K
Date
Q1 2026
|
4d Advisors, LLC | New· Q1 2026 | – | +350K | – | Q1 2026 | |||||
|
Hotchkis & Wiley Capital Management LLC
· Exited
Change
−289K
Δ Own
−100.0%
Date
Q1 2026
|
Hotchkis & Wiley Capital Management LLC | Exited· Q1 2026 | – | −289K | −100.0% | Q1 2026 | |||||
|
Alliancebernstein L.P.
· Added
Change
+283K
Date
Q1 2026
|
Alliancebernstein L.P. | Added· Q1 2026 | – | +283K | – | Q1 2026 | |||||
|
Stanley-Laman Group, Ltd.
· New
Change
+272K
Date
Q1 2026
|
Stanley-Laman Group, Ltd. | New· Q1 2026 | – | +272K | – | Q1 2026 | |||||
|
American Century Companies Inc
· Added
Change
+250K
Date
Q1 2026
|
American Century Companies Inc | Added· Q1 2026 | – | +250K | – | Q1 2026 | |||||
|
Point72 Asset Management, L.P.
· Reduced
Change
−232K
Δ Own
−86.7%
Date
Q1 2026
|
Point72 Asset Management, L.P. | Reduced· Q1 2026 | – | −232K | −86.7% | Q1 2026 | |||||
|
JPMorgan Chase & Co
· Added
Change
+231K
Date
Q1 2026
|
JPMorgan Chase & Co | Added· Q1 2026 | – | +231K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jones Patricia L.
· Director
Grant (A)
4K
|
Jones Patricia L. | Director | Grant (A) | – | 4K | – | 15K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Hagness Larry B.
· Director
Grant (A)
4K
|
Hagness Larry B. | Director | Grant (A) | – | 4K | – | 211K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Iverson Kathleen P.
· Director
Grant (A)
4K
|
Iverson Kathleen P. | Director | Grant (A) | – | 4K | – | 23K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Booth Ronald Richard
· Director
Grant (A)
4K
|
Booth Ronald Richard | Director | Grant (A) | – | 4K | – | 32K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Bauer Jerry M.
· Director
Grant (A)
4K
|
Bauer Jerry M. | Director | Grant (A) | – | 4K | – | 185K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Demorest Robert L.
· Director
Grant (A)
4K
|
Demorest Robert L. | Director | Grant (A) | – | 4K | – | 59K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Hinnendael James J.
· CFO
Grant (A)
7K
|
Hinnendael James J. | CFO | Grant (A) | – | 7K | – | 162K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Marten Randolph L.
· Director
Grant (A)
12K
|
Marten Randolph L. | Director | Grant (A) | – | 12K | – | 17.7M | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Phillips Adam Daniel
· Officer
Grant (A)
5K
|
Phillips Adam Daniel | Officer | Grant (A) | – | 5K | – | 15K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Petit Douglas Paul
· Officer
Grant (A)
6K
|
Petit Douglas Paul | Officer | Grant (A) | – | 6K | – | 41K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Baier Randall John
· Officer
Grant (A)
5K
|
Baier Randall John | Officer | Grant (A) | – | 5K | – | 23K | – | May 5, 2026 | May 7, 2026 | |||||||||
|
Marten Randolph L.
· Director, Officer, 10% Owner
Tax withholding or exercise payment (F)
-$65K
|
Marten Randolph L. | Director, Officer, 10% Owner | Tax withholding or exercise payment (F) | $13.90 | -5K | -$65K | 17.7M | – | Feb 20, 2026 | Feb 23, 2026 | |||||||||
|
Hinnendael James J.
· Officer
Tax withholding or exercise payment (F)
-$40K
|
Hinnendael James J. | Officer | Tax withholding or exercise payment (F) | $13.90 | -3K | -$40K | 155K | – | Feb 20, 2026 | Feb 23, 2026 | |||||||||
|
Phillips Adam Daniel
· Officer
Tax withholding or exercise payment (F)
-$16K
|
Phillips Adam Daniel | Officer | Tax withholding or exercise payment (F) | $13.90 | -1K | -$16K | 11K | – | Feb 20, 2026 | Feb 23, 2026 | |||||||||
|
Petit Douglas Paul
· Officer
Tax withholding or exercise payment (F)
-$32K
|
Petit Douglas Paul | Officer | Tax withholding or exercise payment (F) | $13.90 | -2K | -$32K | 34K | – | Feb 20, 2026 | Feb 23, 2026 | |||||||||
N
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A
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200 reporting institutions disclosed MRTN 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.