Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

MAGNITE, INC.

MGNI · Nasdaq · CIK 0001595974 · Technology · Advertising Agencies

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

79 Form 4 transaction lines observed in the same window
45 sales · 34 option, withholding, award, gift or other lines

Last qualifying purchase2022-05-11 · Lam Rachel · $22.5K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
BARRETT MICHAEL G.CEO
○▼○▼○▼○▼○▼○
Buonasera DavidCHIEF TECHNOLOGY OFFICER
▼▼▼▼▼▼○▼▼▼
Evans Katie SeitzSee Remarks
○▼○○▼▼▼
Buckley Sean PatrickSee Remarks
▼▼○▼○▼▼
Caine PaulDirector
▼▼▼▼▼▼
Knopper Douglas SDirector
▼▼▼▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 9 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2022-05-11 · Lam Rachel.

Recent Form 4 activity

0Purchases
52Sales
73Other Form 4 lines
92SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING45 sale line(s) · context only
OTHER34 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
10,926,829
Previous report
11,433,129
Avg daily volume
2,678,118
Days to cover
4.1

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2022-05-11Lam RachelPurchase (P)Common Stock2,500USD 9.00USD 22,500SEC filing ↗
2022-03-03Lam RachelPurchase (P)Common Stock2,500USD 12.81USD 32,025SEC filing ↗
2021-12-06Lam RachelPurchase (P)Common Stock2,500USD 16.15USD 40,375SEC filing ↗

Form 4 evidence

125 transaction lines in the latest 365-day window; 753 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-12Caine PaulSale (S)Common Stock12,500USD 25.29USD 316,125SEC filing ↗
2026-10-01Sullivan HaasAward / grant (A)Common Stock24,641USD 0.00USD 0SEC filing ↗
2026-10-01Gephart BrianAward / grant (A)Common Stock64,682USD 0.00USD 0SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-12Caine PaulSale (S)Common Stock12,500USD 25.29USD 316,125SEC filing ↗
2026-10-01Sullivan HaasAward / grant (A)Common Stock24,641USD 0.00USD 0SEC filing ↗
2026-10-01Gephart BrianAward / grant (A)Common Stock64,682USD 0.00USD 0SEC filing ↗
2026-09-17Knopper Douglas SSale (S)Common Stock37,337USD 26.28USD 981,216SEC filing ↗
2026-09-17Caine PaulSale (S)Common Stock7,500USD 26.50USD 198,750SEC filing ↗
2026-09-14Spillane Robert FSale (S)Common Stock10,363USD 23.76USD 246,225SEC filing ↗
2026-09-14Spillane Robert FOption exercise / conversion (M)Common Stock10,363USD 5.17USD 53,577SEC filing ↗
2026-09-14Buonasera DavidSale (S)Common Stock1,165USD 24.00USD 27,960SEC filing ↗
2026-09-11Evans Katie SeitzSale (S)Common Stock13,997USD 24.00USD 335,928SEC filing ↗
2026-09-10Saltz AaronSale (S)Common Stock40,000USD 23.41USD 936,400SEC filing ↗
2026-09-10Caine PaulSale (S)Common Stock5,000USD 23.53USD 117,650SEC filing ↗
2026-09-09Evans Katie SeitzSale (S)Common Stock11,100USD 23.46USD 260,406SEC filing ↗
2026-09-08Evans Katie SeitzSale (S)Common Stock32,285USD 23.63USD 762,895SEC filing ↗
2026-09-08Evans Katie SeitzOption exercise / conversion (M)Common Stock13,546USD 5.16USD 69,897SEC filing ↗
2026-09-02Buonasera DavidSale (S)Common Stock1,043USD 25.00USD 26,075SEC filing ↗
2026-09-01Buonasera DavidSale (S)Common Stock5,371USD 23.42USD 125,789SEC filing ↗
2026-08-28Harden Sarah PatriciaSale (S)Common Stock18,436USD 24.00USD 442,464SEC filing ↗
2026-08-26Harden Sarah PatriciaSale (S)Common Stock30,550USD 23.31USD 712,120SEC filing ↗
2026-08-18Buckley Sean PatrickSale (S)Common Stock2,759USD 25.00USD 68,975SEC filing ↗
2026-08-17Buckley Sean PatrickSale (S)Common Stock8,271USD 24.31USD 201,068SEC filing ↗
2026-08-15Saltz AaronTax withholding (F)Common Stock5,627USD 24.73USD 139,156SEC filing ↗
2026-08-15Gephart BrianTax withholding (F)Common Stock3,789USD 24.73USD 93,702SEC filing ↗
2026-08-15Evans Katie SeitzTax withholding (F)Common Stock11,204USD 24.73USD 277,075SEC filing ↗
2026-08-15Day DavidTax withholding (F)Common Stock14,170USD 24.73USD 350,424SEC filing ↗
2026-08-15Buonasera DavidTax withholding (F)Common Stock8,102USD 24.73USD 200,362SEC filing ↗
2026-08-15Buckley Sean PatrickTax withholding (F)Common Stock11,715USD 24.73USD 289,712SEC filing ↗
2026-08-15BARRETT MICHAEL G.Tax withholding (F)Common Stock10,404USD 24.73USD 257,291SEC filing ↗
2026-08-14Caine PaulSale (S)Common Stock7,500USD 25.00USD 187,500SEC filing ↗
2026-08-13Day DavidGift (G)Common Stock26,258USD 0.00USD 0SEC filing ↗
2026-08-10Lam RachelSale (S)Common Stock10,000USD 24.16USD 241,600SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerMGNI
CIK0001595974
SectorTechnology
IndustryAdvertising Agencies Yahoo Finance
SEC SIC7370 Services-Computer Programming, Data Processing, Etc.
ExchangeNasdaq

Data coverage

Local Form 4 history753 transaction lines from 2020-01-15 to 2026-10-12
3 P purchase lines · 376 S sale lines · 374 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.