Quantum Portfolio Management LLC
· New
Change
+14.9M
Date
Q1 2026
TS
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Quantum Portfolio Management LLC
· New
Change
+14.9M
Date
Q1 2026
|
Quantum Portfolio Management LLC | New· Q1 2026 | – | +14.9M | – | Q1 2026 | |||||
|
Bank of Montreal
· Exited
Change
−2.3M
Δ Own
−100.0%
Date
Q1 2026
|
Bank of Montreal | Exited· Q1 2026 | – | −2.3M | −100.0% | Q1 2026 | |||||
|
Strs Ohio
· Added
Change
+2.2M
Date
Q1 2026
|
Strs Ohio | Added· Q1 2026 | – | +2.2M | – | Q1 2026 | |||||
|
Omers Administration Corp
· Added
Change
+1.5M
Date
Q1 2026
|
Omers Administration Corp | Added· Q1 2026 | – | +1.5M | – | Q1 2026 | |||||
|
Morgan Stanley
· Reduced
Change
−1.1M
Date
Q1 2026
|
Morgan Stanley | Reduced· Q1 2026 | – | −1.1M | – | Q1 2026 | |||||
|
Cerity Partners LLC
· Added
Change
+751K
Date
Q1 2026
|
Cerity Partners LLC | Added· Q1 2026 | – | +751K | – | Q1 2026 | |||||
|
Panoramic Investment Advisors, LLC
· New
Change
+611K
Date
Q1 2026
|
Panoramic Investment Advisors, LLC | New· Q1 2026 | – | +611K | – | Q1 2026 | |||||
|
Van Eck Associates Corp
· Reduced
Change
−495K
Date
Q1 2026
|
Van Eck Associates Corp | Reduced· Q1 2026 | – | −495K | – | Q1 2026 | |||||
|
Pathstone Holdings, LLC
· New
Change
+443K
Date
Q1 2026
|
Pathstone Holdings, LLC | New· Q1 2026 | – | +443K | – | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
Change
−393K
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | – | −393K | −100.0% | Q1 2026 | |||||
|
BlackRock
· Reduced
Change
−347K
Date
Q1 2026
|
BlackRock | Reduced· Q1 2026 | – | −347K | – | Q1 2026 | |||||
|
Qube Research & Technologies Ltd
· Added
Change
+342K
Date
Q1 2026
|
Qube Research & Technologies Ltd | Added· Q1 2026 | – | +342K | – | Q1 2026 | |||||
|
JPMorgan Chase & Co
· Reduced
Change
−293K
Date
Q1 2026
|
JPMorgan Chase & Co | Reduced· Q1 2026 | – | −293K | – | Q1 2026 | |||||
|
Rivernorth Capital Management, LLC
· New
Change
+291K
Date
Q1 2026
|
Rivernorth Capital Management, LLC | New· Q1 2026 | – | +291K | – | Q1 2026 | |||||
|
UBS Group AG
· Added
Change
+242K
Date
Q1 2026
|
UBS Group AG | Added· Q1 2026 | – | +242K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Stanley Robert J.
· Director
Other Form 4 events
20K
|
Stanley Robert J. | Director | Other Form 4 events | – | 20K | – | 24K | – | May 28, 2026 | May 29, 2026 | |||||||||
|
Bruck Ross Anthony
· Officer
Buy
+$142K
|
Bruck Ross Anthony | Officer | Buy | $17.76 | +8K | +$142K | 18K | – | May 11, 2026 | May 13, 2026 | |||||||||
|
Waxman Alan
· Officer
Buy
+$831K
|
Waxman Alan | Officer | Buy | $18.47 | +45K | +$831K | 545K | – | Mar 10, 2026 | Mar 11, 2026 | |||||||||
|
Waxman Alan
· Officer
Buy
+$3.6M
|
Waxman Alan | Officer | Buy | $18.18 | +200K | +$3.6M | 500K | – | Mar 9, 2026 | Mar 11, 2026 | |||||||||
|
Covington P. Emery
· Director
Buy
+$138K
|
Covington P. Emery | Director | Buy | $18.35 | +8K | +$138K | 15K | – | Mar 6, 2026 | Mar 10, 2026 | |||||||||
|
Waxman Alan
· Officer
Buy
+$3.7M
|
Waxman Alan | Officer | Buy | $18.42 | +200K | +$3.7M | 300K | – | Mar 6, 2026 | Mar 9, 2026 | |||||||||
|
Waxman Alan
· Officer
Buy
+$1.8M
|
Waxman Alan | Officer | Buy | $18.46 | +100K | +$1.8M | 100K | – | Mar 5, 2026 | Mar 9, 2026 | |||||||||
|
Stiepleman David
· Director, Officer
Buy
+$357K
|
Stiepleman David | Director, Officer | Buy | $17.65 | +20K | +$357K | 26K | – | Mar 2, 2026 | Mar 4, 2026 | |||||||||
|
Peck Joshua
· Officer
Buy
+$50K
|
Peck Joshua | Officer | Buy | $17.59 | +3K | +$50K | 3K | – | Mar 2, 2026 | Mar 3, 2026 | |||||||||
|
Pluss Steven
· Officer
Buy
+$266K
|
Pluss Steven | Officer | Buy | $17.72 | +15K | +$266K | 52K | – | Feb 27, 2026 | Mar 3, 2026 | |||||||||
|
Graf Michael
· Officer
Buy
+$18K
|
Graf Michael | Officer | Buy | $18.26 | +1K | +$18K | 7K | – | Feb 26, 2026 | Mar 2, 2026 | |||||||||
|
Stanley Robert J.
· Director, Officer
Buy
+$208K
|
Stanley Robert J. | Director, Officer | Buy | $20.85 | +10K | +$208K | 25K | – | Nov 18, 2025 | Nov 20, 2025 | |||||||||
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245 reporting institutions disclosed TSLX 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.