William Blair Investment Management, LLC
· New
Change
+476K
Date
Q1 2026
MB
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
William Blair Investment Management, LLC
· New
Change
+476K
Date
Q1 2026
|
William Blair Investment Management, LLC | New· Q1 2026 | – | +476K | – | Q1 2026 | |||||
|
Wellington Management Group LLP
· Reduced
Change
−285K
Δ Own
−16.9%
Date
Q1 2026
|
Wellington Management Group LLP | Reduced· Q1 2026 | – | −285K | −16.9% | Q1 2026 | |||||
|
Ameriprise Financial Inc
· Reduced
Change
−273K
Date
Q1 2026
|
Ameriprise Financial Inc | Reduced· Q1 2026 | – | −273K | – | Q1 2026 | |||||
|
Oberweis Asset Management Inc/
· Exited
Change
−244K
Δ Own
−100.0%
Date
Q1 2026
|
Oberweis Asset Management Inc/ | Exited· Q1 2026 | – | −244K | −100.0% | Q1 2026 | |||||
|
Bridgeway Capital Management, LLC
· New
Change
+128K
Date
Q1 2026
|
Bridgeway Capital Management, LLC | New· Q1 2026 | – | +128K | – | Q1 2026 | |||||
|
Bank of America Corp
· Added
Change
+106K
Date
Q1 2026
|
Bank of America Corp | Added· Q1 2026 | – | +106K | – | Q1 2026 | |||||
|
Landscape Capital Management, L.L.C.
· New
Change
+98K
Date
Q1 2026
|
Landscape Capital Management, L.L.C. | New· Q1 2026 | – | +98K | – | Q1 2026 | |||||
|
Capital World Investors
· Reduced
Change
−90K
Date
Q1 2026
|
Capital World Investors | Reduced· Q1 2026 | – | −90K | – | Q1 2026 | |||||
|
Empowered Funds, LLC
· New
Change
+90K
Date
Q1 2026
|
Empowered Funds, LLC | New· Q1 2026 | – | +90K | – | Q1 2026 | |||||
|
Cooke & Bieler LP
· Reduced
Change
−79K
Date
Q1 2026
|
Cooke & Bieler LP | Reduced· Q1 2026 | – | −79K | – | Q1 2026 | |||||
|
Nomura Asset Management International Inc.
· Reduced
Change
−77K
Date
Q1 2026
|
Nomura Asset Management International Inc. | Reduced· Q1 2026 | – | −77K | – | Q1 2026 | |||||
|
Jacobs Levy Equity Management, Inc
· Added
Change
+67K
Date
Q1 2026
|
Jacobs Levy Equity Management, Inc | Added· Q1 2026 | – | +67K | – | Q1 2026 | |||||
|
American Century Companies Inc
· Added
Change
+58K
Date
Q1 2026
|
American Century Companies Inc | Added· Q1 2026 | – | +58K | – | Q1 2026 | |||||
|
Meros Investment Management, LP
· Added
Change
+57K
Date
Q1 2026
|
Meros Investment Management, LP | Added· Q1 2026 | – | +57K | – | Q1 2026 | |||||
|
Morgan Stanley
· Reduced
Change
−57K
Date
Q1 2026
|
Morgan Stanley | Reduced· Q1 2026 | – | −57K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Connolly Michael
· Director
Grant (A)
$20K
|
Connolly Michael | Director | Grant (A) | $27.43 | 727 | $20K | 62K | +1.2% | Jul 1, 2026 | Jul 1, 2026 | |||||||||
|
Lanigan Mark W.
· Director
Grant (A)
$20K
|
Lanigan Mark W. | Director | Grant (A) | $27.43 | 745 | $20K | 85K | +0.9% | Jul 1, 2026 | Jul 1, 2026 | |||||||||
|
Black David Scott
· CFO
4 operations
-$32K
|
Black David Scott | CFO | 4 operations | $25.00 | -1K | -$32K | 26K | – | May 6, 2026 | May 7, 2026 | |||||||||
|
Lanigan Mark W.
· Director
Grant (A)
$20K
|
Lanigan Mark W. | Director | Grant (A) | $25.92 | 780 | $20K | 85K | – | Apr 1, 2026 | Apr 2, 2026 | |||||||||
|
Connolly Michael
· Director
Grant (A)
$20K
|
Connolly Michael | Director | Grant (A) | $25.92 | 761 | $20K | 61K | – | Apr 1, 2026 | Apr 2, 2026 | |||||||||
|
Connolly Michael
· Director
Grant (A)
$20K
|
Connolly Michael | Director | Grant (A) | $28.21 | 714 | $20K | 60K | – | Jan 2, 2026 | Jan 5, 2026 | |||||||||
|
Lanigan Mark W.
· Director
Grant (A)
$21K
|
Lanigan Mark W. | Director | Grant (A) | $28.21 | 732 | $21K | 84K | – | Jan 2, 2026 | Jan 5, 2026 | |||||||||
|
Menneto Steven
· Director, Officer
Grant (A)
33K
|
Menneto Steven | Director, Officer | Grant (A) | – | 33K | – | 88K | – | Nov 26, 2025 | Dec 1, 2025 | |||||||||
|
Black David Scott
· Officer
Grant (A)
8K
|
Black David Scott | Officer | Grant (A) | – | 8K | – | 27K | – | Nov 21, 2025 | Nov 24, 2025 | |||||||||
|
Black David Scott
· Officer
Grant (A)
4K
|
Black David Scott | Officer | Grant (A) | – | 4K | – | 20K | – | Nov 13, 2025 | Nov 14, 2025 | |||||||||
|
Menneto Steven
· Director, Officer
Tax withholding or exercise payment (F)
-$27K
|
Menneto Steven | Director, Officer | Tax withholding or exercise payment (F) | $27.82 | -965 | -$27K | 55K | – | Nov 6, 2025 | Nov 7, 2025 | |||||||||
|
Beckman Bruce W.
· Officer
Tax withholding or exercise payment (F)
-$8K
|
Beckman Bruce W. | Officer | Tax withholding or exercise payment (F) | $27.82 | -302 | -$8K | 17K | – | Nov 6, 2025 | Nov 7, 2025 | |||||||||
|
Hooks Michael K.
· Director
Grant (A)
3K
|
Hooks Michael K. | Director | Grant (A) | – | 3K | – | 69K | – | Oct 24, 2025 | Oct 28, 2025 | |||||||||
|
Cook Melanie K.
· Director
Grant (A)
3K
|
Cook Melanie K. | Director | Grant (A) | – | 3K | – | 4K | – | Oct 24, 2025 | Oct 28, 2025 | |||||||||
|
Lanigan Mark W.
· Director
Grant (A)
3K
|
Lanigan Mark W. | Director | Grant (A) | – | 3K | – | 83K | – | Oct 24, 2025 | Oct 28, 2025 | |||||||||
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131 reporting institutions disclosed MBUU 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.