Granahan Investment Management, LLC
· Added
Change
+859K
Date
Q1 2026
SI
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Granahan Investment Management, LLC
· Added
Change
+859K
Date
Q1 2026
|
Granahan Investment Management, LLC | Added· Q1 2026 | – | +859K | – | Q1 2026 | |||||
|
Cadian Capital Management, LP
· Added
Change
+716K
Date
Q1 2026
|
Cadian Capital Management, LP | Added· Q1 2026 | – | +716K | – | Q1 2026 | |||||
|
Gilder Gagnon Howe & Co LLC
· Added
Change
+635K
Date
Q1 2026
|
Gilder Gagnon Howe & Co LLC | Added· Q1 2026 | – | +635K | – | Q1 2026 | |||||
|
Paradigm Capital Management Inc
· Added
Change
+598K
Date
Q1 2026
|
Paradigm Capital Management Inc | Added· Q1 2026 | – | +598K | – | Q1 2026 | |||||
|
Morgan Stanley
· Added
Change
+508K
Date
Q1 2026
|
Morgan Stanley | Added· Q1 2026 | – | +508K | – | Q1 2026 | |||||
|
Algert Global LLC
· Reduced
Change
−381K
Date
Q1 2026
|
Algert Global LLC | Reduced· Q1 2026 | – | −381K | – | Q1 2026 | |||||
|
Brown Advisory Inc
· Reduced
Change
−339K
Date
Q1 2026
|
Brown Advisory Inc | Reduced· Q1 2026 | – | −339K | – | Q1 2026 | |||||
|
First Light Asset Management, LLC
· Added
Change
+320K
Date
Q1 2026
|
First Light Asset Management, LLC | Added· Q1 2026 | – | +320K | – | Q1 2026 | |||||
|
Millennium Management LLC
· Added
Change
+262K
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +262K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Exited
Change
−244K
Δ Own
−100.0%
Date
Q1 2026
|
Jane Street Group, LLC | Exited· Q1 2026 | – | −244K | −100.0% | Q1 2026 | |||||
|
Next Century Growth Investors LLC
· Added
Change
+242K
Date
Q1 2026
|
Next Century Growth Investors LLC | Added· Q1 2026 | – | +242K | – | Q1 2026 | |||||
|
Champlain Investment Partners, LLC
· Reduced
Change
−239K
Date
Q1 2026
|
Champlain Investment Partners, LLC | Reduced· Q1 2026 | – | −239K | – | Q1 2026 | |||||
|
Renaissance Technologies LLC
· Added
Change
+238K
Δ Own
+101.6%
Date
Q1 2026
|
Renaissance Technologies LLC | Added· Q1 2026 | – | +238K | +101.6% | Q1 2026 | |||||
|
Impax Asset Management Group PLC
· Added
Change
+225K
Date
Q1 2026
|
Impax Asset Management Group PLC | Added· Q1 2026 | – | +225K | – | Q1 2026 | |||||
|
D. E. Shaw & Co., Inc.
· Reduced
Change
−215K
Δ Own
−53.2%
Date
Q1 2026
|
D. E. Shaw & Co., Inc. | Reduced· Q1 2026 | – | −215K | −53.2% | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Pisetsky Michael A.
· Officer
3 operations
−$52K
|
Pisetsky Michael A. | Officer | 3 operations | $16.70–$16.86 | −3K | −$52K | 277K | −1.1% | Jul 2, 2026 | Jul 6, 2026 | |||||||||
|
Maheshwari Anshul
· Officer
2 operations
−$56K
|
Maheshwari Anshul | Officer | 2 operations | $16.73–$16.80 | −3K | −$56K | 257K | −1.3% | Jul 2, 2026 | Jul 6, 2026 | |||||||||
|
Dunn Jeffrey W.
· Director
Sell
−$55K
|
Dunn Jeffrey W. | Director | Sell | $15.25 | −4K | −$55K | 16K | – | Jun 5, 2026 | Jun 8, 2026 | |||||||||
|
Hilleman Jeryl L.
· Director
Grant (A)
11K
|
Hilleman Jeryl L. | Director | Grant (A) | – | 11K | – | 44K | – | Jun 4, 2026 | Jun 9, 2026 | |||||||||
|
Dunn Jeffrey W.
· Director
Grant (A)
11K
|
Dunn Jeffrey W. | Director | Grant (A) | – | 11K | – | 20K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Nishimura Mika
· Director
Grant (A)
11K
|
Nishimura Mika | Director | Grant (A) | – | 11K | – | 44K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
West Thomas A.
· Director
Grant (A)
11K
|
West Thomas A. | Director | Grant (A) | – | 11K | – | 38K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Freund John Gordon
· Director
Grant (A)
11K
|
Freund John Gordon | Director | Grant (A) | – | 11K | – | 54K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Davis Timothy E. Jr
· Director
Grant (A)
11K
|
Davis Timothy E. Jr | Director | Grant (A) | – | 11K | – | 77K | – | Jun 4, 2026 | Jun 8, 2026 | |||||||||
|
Davis Timothy E. Jr
· Director
Sell
−$49K
|
Davis Timothy E. Jr | Director | Sell | $14.14 | −4K | −$49K | 66K | – | May 29, 2026 | Jun 1, 2026 | |||||||||
|
Davis Timothy E. Jr
· Director
Sell
−$55K
|
Davis Timothy E. Jr | Director | Sell | $14.47 | −4K | −$55K | 69K | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Davis Timothy E. Jr
· Director
2 operations
0
|
Davis Timothy E. Jr | Director | 2 operations | $4.32 | 0 | – | 0 | – | May 28, 2026 | Jun 1, 2026 | |||||||||
|
Francis Laura
· Director
5 operations
−$220K
|
Francis Laura | Director | 5 operations | $14.57–$14.75 | −15K | −$220K | 503K | – | May 18, 2026 | May 20, 2026 | |||||||||
|
Pisetsky Michael A.
· Officer
2 operations
−$55K
|
Pisetsky Michael A. | Officer | 2 operations | $14.63 | −4K | −$55K | 281K | – | May 18, 2026 | May 20, 2026 | |||||||||
|
Maheshwari Anshul
· CFO
2 operations
−$69K
|
Maheshwari Anshul | CFO | 2 operations | $14.65–$14.71 | −5K | −$69K | 260K | – | May 18, 2026 | May 20, 2026 | |||||||||
N
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187 reporting institutions disclosed SIBN 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.