Magnite, Inc.· MGNI

🇺🇸 US · MidBroad USNASDAQ

Communication Services Advertising Agencies Website

Price: $25.31
Day: +0.64%
Mkt Cap: $3.62B
52W Range: $10.82 – $26.84
Volume: 1.62M
Beta: 2.29

D55D FrameworkQuarterly Data

Holdings Analysis

Insider activity, institutional flows, and fund ownership.

Smart Money: 3.6 / 5 (Bullish), from 3 of 3 components
Institutions Q2 2026: 333 institutions hold; 175 added, 91 reduced
Insiders Q3 2026: no purchases, 32 sales ($17.6M)

Blog

stockoscope.com

Magnite, Inc.

MGNI|Communication Services|Advertising Agencies

Current price: $25

Smart Money

Dimension 5 of 5

Insider selling pace · Q3 2026

2.1x

vs own 6-quarter average

Seller breadth · Q3 2026

11 sellers

vs 7.0 avg per quarter

Institutional net breadth · Q2 2026

+102

233 adding vs 131 reducing

Institutional ownership · Q2 2026

N/A

overlapping 13F filings

Insider Selling Pace

Each quarter's selling vs this stock's own trailing 6-quarter average

Light <0.5xRoutineElevated >1.5xHeavy >3xBuying

Institutional Positions

Institutions adding above the line, reducing below, net as a line

NewIncreasedReducedClosedNet

Largest Institutional Holders, Q2 2026

By reported market value, and how each moved in the quarter

Holder

Change

BLACKROCK, INC.

12.7M

+9.4%

VANGUARD PORTFOLIO MANAGEMENT LLC

8.2M

+6.5%

FMR LLC

7.8M

+72.8%

VANGUARD CAPITAL MANAGEMENT LLC

6.2M

+0.9%

WELLINGTON MANAGEMENT GROUP LLP

6.0M

-34.0%

DIMENSIONAL FUND ADVISORS LP

5.3M

+32.5%

ETF & Fund Activity, Q2 2026

How the covering funds split between buying, holding and selling

122

71 buying122 unchanged56 selling

249 funds held MGNI in Q2 2026, holding 68.0M shares between them, down 1.1% on the quarter.

Largest fund holders

MADISON FUNDS311.8K sh

SPDR SERIES TRUST91.1K sh

Listed Funds Trust75.0K sh

Notable Insider Transactions, Q3 2026

Largest open-market purchases and sales by value in the last eight quarters

Sale · Aug 6

BARRETT MICHAEL G.

$6.7M

Sale · Jun 24

BARRETT MICHAEL G.

$6.0M

Sale · Jun 15

BARRETT MICHAEL G.

$3.0M

Insider transactions from SEC Form 4 filings; institutional holdings from quarterly 13F filings, which are reported with a lag and can overlap between filers. 13F: quarterly institutional holdings report · ETF: Exchange-Traded Fund

See the complete picture

The full 5D Framework: Business Quality · Peer Comparison · Valuation · Analyst Sentiment · Smart Money

Explore MGNI on stockoscope.com→

Generated September 22, 2026

For educational purposes only. Not financial advice. Data may be delayed or incomplete.

Smart Money Sentiment

MGNI Smart Money Sentiment Score

A weighted 1-5 sentiment score across three smart money signals.

Smart Money

3.6/5

Bullish

Weighted across 3 components

Component Breakdown (3 of 3 available)

Insider Activity

40% weight

-35

Institutional Flow

50% weight

+82

Fund Flow

10% weight

+25

Overall Smart Money sentiment of 3.6/5 (Bullish) based on a weighted combination of 3 components. Insider activity uses a relative-baseline comparison against the stock's own history; institutional flow tracks position momentum and 13F share changes; fund flow measures ETF / mutual-fund buying vs selling. Higher scores indicate stronger bullish sentiment from professional investors.Last updated September 21, 2026.

Insider Trading Activity

Insider trading analysis comparing the latest quarter against the stock's own historical baseline.

Insider Selling Pace for MGNI

Each quarter's selling vs the stock's own trailing 6-quarter average; 1.0x is typical for this stock. Green triangles mark quarters with insider buying.

Bearish Signal

Elevated insider selling in Q3 2026

32 sales totaling $17.6M (759.7K shares)

Share volume is elevated at 2.1x the historical average

11 different insiders sold this quarter

Sell-only pattern: no insider purchases across 15 quarters

Steady selling pace across recent quarters

2.1x

Selling pace

vs own 6-qtr average

Elevated

9.88%

Stake sold

of active insiders' holdings

11 sellers

Seller breadth

vs 7.0 avg per quarter

None

Insider buying

in the last 16 quarters

Notable Recent Transactions, MGNI

Top 8 highest-value insider trades from the last 8 quarters

BARRETT MICHAEL G.

CEO

Sell

293,968 shares at $22.72

≈42.2% of their stake at the time

Aug 6, 2026$6.68M

BARRETT MICHAEL G.

CEO

Sell

300,000 shares at $20.01

≈45.7% of their stake at the time

Jun 24, 2025$6.00M

BARRETT MICHAEL G.

CEO

Sell

178,596 shares at $16.59

≈30.7% of their stake at the time

Jun 15, 2026$2.96M

Rossman James

Director

Sell

149,936 shares at $19.46

≈40.5% of their stake at the time

Feb 7, 2025$2.92M

BARRETT MICHAEL G.

CEO

Sell

147,996 shares at $17.52

≈18.9% of their stake at the time

Dec 4, 2024$2.59M

Rossman James

Director

Sell

137,007 shares at $18.78

≈59.4% of their stake at the time

Jun 18, 2025$2.57M

BARRETT MICHAEL G.

CEO

Sell

100,000 shares at $17.50

≈19.9% of their stake at the time

Jun 16, 2026$1.75M

BARRETT MICHAEL G.

CEO

Sell

70,900 shares at $23.27

≈19.9% of their stake at the time

Jul 15, 2025$1.65M

Institutional Ownership Analysis

Institutional ownership analysis with position momentum, 13F share flow, and ownership percentage trends.

Institutional Positions for MGNI

Institutions adding (new + increased) above zero, reducing (reduced + closed) below, net as a line

New Increased Reduced Closed Net (adding − reducing)

Very Bullish

Institutions accumulating in Q2 2026

13F filings cover more than 100% of shares this quarter (overlapping reports), so ownership and share-flow figures are unreliable

Moderate accumulation: 233 adding vs 131 reducing

Momentum improving from prior quarter

+102

Net breadth

233 adding vs 131 reducing

Accumulating

1.78

Add / reduce ratio

in Q2 2026

+18

New − closed

58 initiated, 40 exited

8 of 10

Top holders adding

largest holders with a known change

Position Changes

Q2 2026: how are institutions adjusting their positions?

+233 growing-131 shrinkingNet: +102

175

New (58)

Increased (175)

Reduced (91)

Closed (40)

Top Institutional Holders, MGNI

Largest 8 institutional positions by ownership percentage as of Q2 2026

BLACKROCK, INC.

12.7M

$241.3M

Ownership

8.89%

+9.4%

VANGUARD PORTFOLIO MANAGEMENT LLC

8.2M

$155.6M

Ownership

5.73%

+6.5%

FMR LLC

7.8M

$147.3M

Ownership

5.43%

+72.8%

VANGUARD CAPITAL MANAGEMENT LLC

6.2M

$118.2M

Ownership

4.35%

+0.9%

WELLINGTON MANAGEMENT GROUP LLP

6.0M

$114.7M

Ownership

4.23%

-34.0%

DIMENSIONAL FUND ADVISORS LP

5.3M

$99.8M

Ownership

3.68%

+32.5%

BOSTON PARTNERS

5.0M

$95.9M

Ownership

3.51%

+6.6%

AMERICAN CENTURY COMPANIES INC

4.6M

$87.7M

Ownership

3.23%

+0.3%

ETF and Mutual Fund Holdings

ETF and mutual fund activity breakdown showing buying vs selling funds, top fund holders, and detailed holdings.

Fund Activity

Q2 2026: 249 ETFs and mutual funds reporting

71 buying56 sellingNet: +15

122

Buying (71)

Unchanged (122)

Selling (56)

In total, funds bought 3.0M shares and sold 3.8M this quarter. Each fund counts once in the bar above, whatever the size of its move.

Bullish Signal

Funds accumulating in Q2 2026

249 ETFs and mutual funds reporting

71 buying vs 56 selling (balanced)

Top Fund Holders, MGNI

Largest 8 ETF and mutual fund positions by shares held, each fund's latest filing

MADISON FUNDS

311.8K

Weight

6.43%

Jul 31, 2026No change

SPDR SERIES TRUST

91.1K

Weight

0.45%

Jul 31, 2026No change

Listed Funds Trust

75.0K

Weight

—

Jul 31, 2026No change

ETF Series Solutions

47.1K

Weight

—

Jul 31, 2026No change

FIRST TRUST EXCHANGE-TRADED FUND

37.1K

Weight

0.14%

Jun 30, 2026No change

TRANSAMERICA SERIES TRUST

35.3K

Weight

0.01%

Jun 30, 2026No change

STERLING CAPITAL FUNDS

34.2K

Weight

0.14%

Jun 30, 2026No change

BlackRock Advantage SMID Cap Fund, Inc.

32.0K

Weight

5.69%

Jun 30, 2026No change

Magnite, Inc.· MGNI

Holdings Analysis

Insider Trading Activity

1.3Transaction History211Real market purchases and sales onlyShow All Types

Institutional Ownership Analysis

2.4Detailed Holdings123Most recent institutional positions with changes and valuations

ETF and Mutual Fund Holdings

3.3Fund Holdings Details25Most recent ETF and mutual fund holdings with share counts and weights

Search stocks

Holdings Analysis

Insider Trading Activity

1.3Transaction History211Real market purchases and sales onlyShow All Types

Institutional Ownership Analysis

2.4Detailed Holdings123Most recent institutional positions with changes and valuations

ETF and Mutual Fund Holdings

3.3Fund Holdings Details25Most recent ETF and mutual fund holdings with share counts and weights