BlackRock
· Reduced
Change
−6.4M
Date
Q1 2026
MY
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
BlackRock
· Reduced
Change
−6.4M
Date
Q1 2026
|
BlackRock | Reduced· Q1 2026 | – | −6.4M | – | Q1 2026 | |||||
|
State Street
· Reduced
Change
−1.5M
Date
Q1 2026
|
State Street | Reduced· Q1 2026 | – | −1.5M | – | Q1 2026 | |||||
|
Acadian Asset Management LLC
· Added
Change
+1.3M
Date
Q1 2026
|
Acadian Asset Management LLC | Added· Q1 2026 | – | +1.3M | – | Q1 2026 | |||||
|
Hrt Financial LP
· Added
Change
+1.3M
Date
Q1 2026
|
Hrt Financial LP | Added· Q1 2026 | – | +1.3M | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Added
Change
+1.1M
Date
Q1 2026
|
Jane Street Group, LLC | Added· Q1 2026 | – | +1.1M | – | Q1 2026 | |||||
|
Marshall Wace, LLP
· Added
Change
+1.1M
Date
Q1 2026
|
Marshall Wace, LLP | Added· Q1 2026 | – | +1.1M | – | Q1 2026 | |||||
|
Glenview Capital Management, LLC
· Added
Change
+825K
Δ Own
+18.0%
Date
Q1 2026
|
Glenview Capital Management, LLC | Added· Q1 2026 | – | +825K | +18.0% | Q1 2026 | |||||
|
Vanguard
· Reduced
Change
−823K
Date
Q1 2026
|
Vanguard | Reduced· Q1 2026 | – | −823K | – | Q1 2026 | |||||
|
Qube Research & Technologies Ltd
· Added
Change
+817K
Date
Q1 2026
|
Qube Research & Technologies Ltd | Added· Q1 2026 | – | +817K | – | Q1 2026 | |||||
|
Walleye Capital LLC
· Exited
Change
−677K
Δ Own
−100.0%
Date
Q1 2026
|
Walleye Capital LLC | Exited· Q1 2026 | – | −677K | −100.0% | Q1 2026 | |||||
|
Federated Hermes, Inc.
· Added
Change
+666K
Date
Q1 2026
|
Federated Hermes, Inc. | Added· Q1 2026 | – | +666K | – | Q1 2026 | |||||
|
Royce & Associates LP
· Exited
Change
−605K
Δ Own
−100.0%
Date
Q1 2026
|
Royce & Associates LP | Exited· Q1 2026 | – | −605K | −100.0% | Q1 2026 | |||||
|
Dimensional
· Reduced
Change
−548K
Date
Q1 2026
|
Dimensional | Reduced· Q1 2026 | – | −548K | – | Q1 2026 | |||||
|
Principal Financial Group Inc
· Exited
Change
−444K
Δ Own
−100.0%
Date
Q1 2026
|
Principal Financial Group Inc | Exited· Q1 2026 | – | −444K | −100.0% | Q1 2026 | |||||
|
Morgan Stanley
· Reduced
Change
−439K
Date
Q1 2026
|
Morgan Stanley | Reduced· Q1 2026 | – | −439K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Raha Samraat S.
· Director
Grant (A)
$14K
|
Raha Samraat S. | Director | Grant (A) | $3.94 | 4K | $14K | 1.1M | – | Jun 11, 2026 | Jun 12, 2026 | |||||||||
|
Donnelly Brian J.
· Officer
Grant (A)
$20K
|
Donnelly Brian J. | Officer | Grant (A) | $3.94 | 5K | $20K | 573K | – | Jun 11, 2026 | Jun 12, 2026 | |||||||||
|
Kumar Rashmi
· Director
Sell
−$67K
|
Kumar Rashmi | Director | Sell | $4.46 | −15K | −$67K | 172K | – | Jun 8, 2026 | Jun 9, 2026 | |||||||||
|
Skovronsky Daniel
· Director
Grant (A)
60K
|
Skovronsky Daniel | Director | Grant (A) | – | 60K | – | 196K | – | Jun 4, 2026 | Jun 5, 2026 | |||||||||
|
Newcomer Lee Nisley
· Director
Grant (A)
60K
|
Newcomer Lee Nisley | Director | Grant (A) | – | 60K | – | 192K | – | Jun 4, 2026 | Jun 5, 2026 | |||||||||
|
Davis Mark Steven
· Director
Grant (A)
60K
|
Davis Mark Steven | Director | Grant (A) | – | 60K | – | 107K | – | Jun 4, 2026 | Jun 5, 2026 | |||||||||
|
Phanstiel S. Louise
· Director
Grant (A)
60K
|
Phanstiel S. Louise | Director | Grant (A) | – | 60K | – | 342K | – | Jun 4, 2026 | Jun 5, 2026 | |||||||||
|
Dreismann Heinrich
· Director
Grant (A)
60K
|
Dreismann Heinrich | Director | Grant (A) | – | 60K | – | 231K | – | Jun 4, 2026 | Jun 5, 2026 | |||||||||
|
Reitan Colleen F.
· Director
Grant (A)
60K
|
Reitan Colleen F. | Director | Grant (A) | – | 60K | – | 152K | – | Jun 4, 2026 | Jun 5, 2026 | |||||||||
|
Bisaro Paul
· Director
Grant (A)
60K
|
Bisaro Paul | Director | Grant (A) | – | 60K | – | 157K | – | Jun 4, 2026 | Jun 5, 2026 | |||||||||
|
Kumar Rashmi
· Director
Grant (A)
60K
|
Kumar Rashmi | Director | Grant (A) | – | 60K | – | 187K | – | Jun 4, 2026 | Jun 5, 2026 | |||||||||
|
Jampa Raj
· Officer
Grant (A)
252K
|
Jampa Raj | Officer | Grant (A) | – | 252K | – | 252K | – | Jun 1, 2026 | Jun 2, 2026 | |||||||||
|
Bisaro Paul
· Director
Buy
+$28K
|
Bisaro Paul | Director | Buy | $3.69 | +8K | +$28K | 97K | – | May 14, 2026 | May 14, 2026 | |||||||||
|
Donnelly Brian J.
· Officer
Tax withholding or exercise payment (F)
-$269K
|
Donnelly Brian J. | Officer | Tax withholding or exercise payment (F) | $4.80 | -56K | -$269K | 568K | – | May 1, 2026 | May 4, 2026 | |||||||||
|
Verratti Mark
· Officer
Tax withholding or exercise payment (F)
-$5K
|
Verratti Mark | Officer | Tax withholding or exercise payment (F) | $4.91 | -1K | -$5K | 630K | – | Apr 14, 2026 | Apr 15, 2026 | |||||||||
N
A
M
G
A
A
213 reporting institutions disclosed MYGN 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.