MAGNITE INC (MGNI): Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in MGNI · Communication Services. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
21
13F filers
Aggregate Value
$125.4M
Across holders
Last Price
$23.55
2026-10-19
Sector
Communication Services
GICS
Quarterly fund activity10 increased9 reduced4 exited
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| Qube Research & Technologies Ltd CIK 0001729829 | Hedge Fund | 1.96M | $37.1M | 29.6% | 0.0% | Added | +$24.6M | Q2 2026 |
| MILLENNIUM MANAGEMENT LLC CIK 0001273087 | Hedge Fund | 765K | $14.5M | 11.6% | 0.0% | Reduced | $-8.9M | Q2 2026 |
| First Eagle Investment Management, LLC CIK 0001325447 | Institutional Manager | 671K | $12.7M | 10.2% | 0.0% | Added | +$4.2M | Q2 2026 |
| BALYASNY ASSET MANAGEMENT LLC CIK 0001218710 | Hedge Fund | 667K | $12.7M | 10.1% | 0.0% | Reduced | $-15.8M | Q2 2026 |
| Schonfeld Strategic Advisors LLC CIK 0001665241 | Hedge Fund | 562K | $10.7M | 8.5% | 0.0% | Reduced | $-19.8M | Q2 2026 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 473K | $9.0M | 7.2% | 0.0% | Reduced | $-30.5M | Q2 2026 |
| MARSHALL WACE, LLP CIK 0001318757 | Hedge Fund | 342K | $6.5M | 5.2% | 0.0% | Added | +$6.0M | Q2 2026 |
| ExodusPoint Capital Management, LP CIK 0001736225 | Hedge Fund | 272K | $5.2M | 4.1% | 0.0% | Added | — | Q2 2026 |
| Squarepoint Ops LLC CIK 0001642575 | Hedge Fund | 230K | $4.4M | 3.5% | 0.0% | Reduced | $-16.3M | Q2 2026 |
| Senvest Management, LLC CIK 0001328785 | Hedge Fund | 224K | $4.3M | 3.4% | 0.1% | Unchanged | +$0 | Q2 2026 |
Added
Hedge Fund
$37.1M· 29.6% of total· 0.0% port· 1.96M sh· +$24.6M QoQ· Q2 2026
Reduced
Hedge Fund
$14.5M· 11.6% of total· 0.0% port· 765K sh· $-8.9M QoQ· Q2 2026
Added
Institutional Manager
$12.7M· 10.2% of total· 0.0% port· 671K sh· +$4.2M QoQ· Q2 2026
Reduced
Hedge Fund
$12.7M· 10.1% of total· 0.0% port· 667K sh· $-15.8M QoQ· Q2 2026
Reduced
Hedge Fund
$10.7M· 8.5% of total· 0.0% port· 562K sh· $-19.8M QoQ· Q2 2026
Reduced
Hedge Fund
$9.0M· 7.2% of total· 0.0% port· 473K sh· $-30.5M QoQ· Q2 2026
Added
Hedge Fund
$6.5M· 5.2% of total· 0.0% port· 342K sh· +$6.0M QoQ· Q2 2026
Added
Hedge Fund
$5.2M· 4.1% of total· 0.0% port· 272K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$4.4M· 3.5% of total· 0.0% port· 230K sh· $-16.3M QoQ· Q2 2026
Unchanged
Hedge Fund
$4.3M· 3.4% of total· 0.1% port· 224K sh· +$0 QoQ· Q2 2026
Added
Hedge Fund
$3.4M· 2.7% of total· 0.0% port· 177K sh· $-10.2M QoQ· Q2 2026
Added
Institutional Manager
$1.2M· 1.0% of total· 0.0% port· 63K sh· +$46K QoQ· Q2 2026
Reduced
Hedge Fund
$1.0M· 0.8% of total· 0.0% port· 53K sh· $-10.9M QoQ· Q2 2026
Reduced
Hedge Fund
$810K· 0.6% of total· 0.0% port· 43K sh· $-6.7M QoQ· Q2 2026
Added
Hedge Fund
$678K· 0.5% of total· 0.0% port· 36K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$506K· 0.4% of total· 0.0% port· 27K sh· $-812K QoQ· Q2 2026
Added
Hedge Fund
$417K· 0.3% of total· 0.0% port· 22K sh· — QoQ· Q2 2026
Added
Hedge Fund
$318K· 0.3% of total· 0.0% port· 17K sh· +$69K QoQ· Q2 2026
Added
Hedge Fund
$95K· 0.1% of total· 0.0% port· 5K sh· +$15K QoQ· Q2 2026
Reduced
Hedge Fund
$46K· 0.0% of total· 0.0% port· 2K sh· $-694K QoQ· Q2 2026
Unchanged
Hedge Fund
$209· 0.0% of total· 0.0% port· 11 sh· +$0 QoQ· Q2 2026
1–10 of 21
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Recent insider activity
Form 4 purchases and sales · 24 Jul 2026 – 21 Oct 20260 buyers · $011 sellers · $16.3M25 transactions
| Insider ⇅ | Trades ⇅ | Bought ⇅ | Sold ⇅ | Largest ⇅ | Latest ▼ | |
|---|---|---|---|---|---|---|
| Caine Paul Director | 5 0 buy · 5 sell | — | $942K | $316K | 12 Oct 2026SEC ↗ | |
| Knopper Douglas S Director | 2 0 buy · 2 sell | — | $1.8M | $981K | 17 Sept 2026SEC ↗ | |
| Buonasera David CHIEF TECHNOLOGY OFFICER | 3 0 buy · 3 sell | — | $186K | $95K | 14 Sept 2026SEC ↗ | |
| Spillane Robert F Director | 1 0 buy · 1 sell | — | $246K | $246K | 14 Sept 2026SEC ↗ | |
| Evans Katie Seitz See Remarks | 4 0 buy · 4 sell | — | $1.8M | $763K | 11 Sept 2026SEC ↗ | |
| Saltz Aaron CHIEF LEGAL OFFICER | 1 0 buy · 1 sell | — | $936K | $936K | 10 Sept 2026SEC ↗ | |
| Harden Sarah Patricia Director | 2 0 buy · 2 sell | — | $1.2M | $712K | 28 Aug 2026SEC ↗ | |
| Buckley Sean Patrick See Remarks | 4 0 buy · 4 sell | — | $1.9M | $1.2M | 18 Aug 2026SEC ↗ | |
| Gephart Brian CHIEF ACCOUNTING OFFICER | 1 0 buy · 1 sell | — | $308K | $308K | 10 Aug 2026SEC ↗ | |
| Lam Rachel Director | 1 0 buy · 1 sell | — | $242K | $242K | 10 Aug 2026SEC ↗ |
1–10 of 11 insiders
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Distinct buyers and sellers may overlap. “Largest” is the largest reported transaction value in this window. Expand a row to see up to five recent filings.