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See how Context works →On the price, the facts of the public record■Insider buy□Insider sell●Results filed
With an account, also○dividends▲splits◌next earningswith an account
End-of-day prices provided by Twelve Data · One close per session; the series does not update during the trading day.
Latest on record
The most recent facts, as filed.
Up to three of the most recent, checkable facts already loaded on this page, each linked to its source.
- Oct 12, 2026Reported sale · Form 4Paul Caine · $316.1KOpen the filing ↗
- Oct 7, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
- Sep 21, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
In numbers
What this profile holds, counted.
Closes · 1 year250
SEC filings on record1,27317 flagged findings
Reported transactions (Form 4)80since Jan 9, 2025 · and 2 other holdings
Corporate events (8-K)30since Jun 18, 2020
What the record says
Description, identity and filings, each with its source.
Every block cites its source. The colour of a finding marks its category — which document, who filed it — not how much it matters.
What the company does
Magnite Inc. is an American online advertising technology firm based in Los Angeles, California. The company was formed following a merger between Rubicon Project and Telaria in 2020.
Source: Wikipedia (CC BY-SA 4.0) · copied on Sep 3, 2026 · may not reflect recent changes.
Regulatory history
Topics detected in its SEC reports, with the original excerpt.
Each topic is assigned by a classifier over the full filing; the excerpts show where it was detected and are not always enough to verify it. Open the filing to read it in full.
- 2026-05-06share offering or dilution eventrecentOpen filing ↗“…from the calculation of diluted net income (loss) per share attributable to common stockholders for each period presented because…”
+1 more passage from the same document
- “…costs is computed using the effective interest method and is included in interest expense in the condensed consolidated…”
- 2026-05-06capital return (buybacks/dividends)recentOpen filing ↗“…reimbursement for these tax deposits, we have the option to withhold from shares otherwise issuable upon vesting a portion of…”
+1 more passage from the same document
- “…statutory employee withholding taxes on behalf of the holders of the vested awards. As reimbursement for these tax deposits, we…”
Original excerpts from SEC filings, untranslated. Not advice and not a prediction.
The 25 most recent filings (of 1,273)
Every SEC filing, newest first, with what it is. Below, each type with its own explanation.
- Oct 14, 26Form 4 ↗Insider transaction new
- Oct 7, 268-K ↗Current report · Entered a material agreement
- Oct 2, 26Form 4 ↗Insider transaction
- Oct 2, 26Form 3 ↗Insider transaction
- Oct 2, 26Form 4 ↗Insider transaction
- Sep 21, 268-K ↗Current report · A senior executive left or was appointed
Notice of proposed sale · 2 Form 144 filingsshow all 2hide
- Sep 17, 26Form 144 ↗Notice of proposed sale
- Sep 17, 26Form 144 ↗Notice of proposed sale
Notice of proposed sale · 3 Form 144 filingsshow all 3hide
- Sep 14, 26Form 144 ↗Notice of proposed sale
- Sep 14, 26Form 144 ↗Notice of proposed sale
- Sep 11, 26Form 144 ↗Notice of proposed sale
Notice of proposed sale · 2 Form 144 filingsshow all 2hide
- Sep 10, 26Form 144 ↗Notice of proposed sale
- Sep 10, 26Form 144 ↗Notice of proposed sale
- Sep 10, 26Form 4 ↗Insider transaction
Notice of proposed sale · 2 Form 144 filingsshow all 2hide
- Sep 9, 26Form 144 ↗Notice of proposed sale
- Sep 8, 26Form 144 ↗Notice of proposed sale
- Sep 3, 26Form 4 ↗Insider transaction
- Sep 2, 26Form 144 ↗Notice of proposed sale
1,273 filings on record, the oldest from Apr 1, 14.
Listing the 25 most recent filings of the 1,273 on record.
43030
- Oct 7, 26Entered a material agreement+2 more in the same filing8-K 1.01 ↗
3 senior executive changes2026show all 3hide
- Sep 21, 26A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Apr 20, 26A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Apr 10, 26A senior executive left or was appointed8-K 5.02 ↗
- Sep 5, 25Entered a material agreement8-K 1.01 ↗
- Mar 18, 25Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- Dec 12, 24A senior executive left or was appointed8-K 5.02 ↗
- Sep 18, 24Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- Feb 7, 24Entered a material agreement+4 more in the same filing8-K 1.01 ↗
3 senior executive changes2021 – 2022show all 3hide
- Aug 3, 22A senior executive left or was appointed8-K 5.02 ↗
- Mar 22, 22A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Aug 31, 21A senior executive left or was appointed8-K 5.02 ↗
- Jul 2, 21Entered a material agreement+3 more in the same filing8-K 1.01 ↗
- May 28, 21A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Apr 30, 21Entered a material agreement+6 more in the same filing8-K 1.01 ↗
- Mar 19, 21Took on a new financial obligation+3 more in the same filing8-K 2.03 ↗
5 older filings not shown · The record reaches back to Nov 17, 14.
Stress disclosures older than the timeline above. They are individual events from the record, not a complete timeline: there may be more between them.
- May 27, 20Listing notice (8-K 3.01)8-K 3.01 ↗
- Mar 14, 18Restructuring plan with committed costs+2 more in the same filing8-K 2.05 ↗
- Jan 18, 17Restructuring plan with committed costs8-K 2.05 ↗
- Nov 2, 16Restructuring plan with committed costs+2 more in the same filing8-K 2.05 ↗
The full record holds 4 stress filings.
Corporate events are tracked from 2004-08-23, when the SEC renumbered 8-K items. Earlier filings use an incompatible numbering and are not classified here.
Schedule 13G: short-form filing
The short form, for holders who meet specific requirements: institutional investors, passive investors without a control purpose, or exempt investors. Asset managers and index funds usually file it.
- The Vanguard Group10.3%Sep 30, 25SCHEDULE 13G/A ↗
- Vanguard Portfolio Management5.4%Mar 31, 26SCHEDULE 13G ↗
- FMR LLC5.4%Jun 30, 26SCHEDULE 13G ↗2 co-filers on this document — the figure is the largest single stake, not their sum. · 4 earlier filings
- Vanguard Capital Management5.0%Mar 31, 26SCHEDULE 13G ↗
- Wellington Management Group LLP4.2%Jun 30, 26SCHEDULE 13G/A ↗3 co-filers on this document — the figure is the largest single stake, not their sum. · 1 earlier filing
show one more holderhide
- Capital Research Global Investors3.5%Mar 31, 26SCHEDULE 13G/A ↗3 earlier filings
Structured 13D/G data starts 2023-12, when the SEC moved these filings to a machine-readable format. Earlier filings exist but are not parsed here.
Sale intention announced
On Sep 17, PAUL CAINE filed notice of intent to sell up to $476K. That is about 0.01% of shares outstanding. It is filed under a scheduled plan (10b5-1), arranged in advance.
A notice is not a sale: it may not go ahead, may happen in part, or at a different price.
After the notice, they sold $515K across 2 trades, between Sep 17 and Oct 12, per their Form 4. That is 100% of the shares announced so far, and the window is still open.
View notice (Form 144) ↗+9 more recent notices · 9 with a later sale
- Oct 12, 26Sell$316KPaul Caine↗
- Sep 17, 26Sell$981KDouglas S Knopper↗
- Sep 17, 26Sell$199KPaul Caine↗
- Sep 14, 26Sell$246KRobert F Spillane↗
- Sep 14, 26Sell$28KDavid BuonaseraCHIEF TECHNOLOGY OFFICER↗
- Sep 11, 26Sell$336KKatie Seitz EvansSee Remarks↗
- Sep 10, 26Sell$118KPaul Caine↗
- Sep 10, 26Sell$936KAaron SaltzCHIEF LEGAL OFFICER↗
- Sep 9, 26Sell$260KKatie Seitz EvansSee Remarks↗
- Sep 8, 26Sell$763KKatie Seitz EvansSee Remarks↗
- Sep 2, 26Sell$26KDavid BuonaseraCHIEF TECHNOLOGY OFFICER↗
- Sep 1, 26Sell$126KDavid BuonaseraCHIEF TECHNOLOGY OFFICER↗
There are 13 more transactions in this stretch.
Stock compensation, tax and giftsshow the 15 other transactionshide
Stock compensation, tax withholding, option exercises and gifts. They are listed separately and are not included in the purchase and sale totals. The type describes the transaction, not the filer's intent.
- Oct 1, 26Compensationamount n/aBrian GephartCHIEF FINANCIAL OFFICER↗
- Oct 1, 26Compensationamount n/aHaas SullivanCHIEF ACCOUNTING OFFICER↗
- Sep 14, 26Compensation$54KRobert F Spillane↗
- Sep 8, 26Compensation$70KKatie Seitz EvansSee Remarks↗
- Aug 15, 26Tax$257KMICHAEL G. BARRETTCEO↗
- Aug 15, 26Tax$350KDavid DayCHIEF FINANCIAL OFFICER↗
- Aug 15, 26Tax$277KKatie Seitz EvansSee Remarks↗
- Aug 15, 26Tax$94KBrian GephartCHIEF ACCOUNTING OFFICER↗
- Aug 15, 26Tax$139KAaron SaltzCHIEF LEGAL OFFICER↗
- Aug 15, 26Tax$290KSean Patrick BuckleySee Remarks↗
- Aug 15, 26Tax$200KDavid BuonaseraCHIEF TECHNOLOGY OFFICER↗
- Aug 13, 26Giftamount n/aDavid DayCHIEF FINANCIAL OFFICER↗
- Aug 6, 26Compensation$1.7MMICHAEL G. BARRETTCEO↗
- Aug 6, 26Compensation$103KKatie Seitz EvansSee Remarks↗
- Aug 6, 26Compensation$399KSean Patrick BuckleySee Remarks↗
The full record holds 412 transactions and goes back to Jan 1, 23.
Its sector and its market
Magnite, Inc. among Communication Services companies
The profile shows what is on record. Context and Radar place the company among those of its sector and region.
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- End-of-day closes provided by Twelve Data. One close per session; not real time. Closes adjusted for splits.
- Series quality
- 250 clean closes in the period.
- SEC records
- 1,273 documents on file, from Apr 1, 2014 to Oct 14, 2026.
- Company description
- Wikipedia, read on Sep 3, 2026.
- This page
- Generated on Oct 19, 2026; refreshed through the day.
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Which SEC documents appear here?
Those filed with the SEC by the company, its insiders and its major shareholders, within our coverage: periodic reports (10-K, 10-Q, 20-F), material events (8-K), proposed sale notices (Form 144), insider transactions (Form 4) and stakes above 5% (13D/13G). Each links to the original on EDGAR.
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It depends on the company: some European issuers file a 20-F or 6-K with the SEC and others don't. The profile shows whatever is on record; when there is nothing, it says so rather than guessing why. Europe does not yet have a common filing archive like EDGAR in the United States. The EU will open its own, ESAP, in July 2027 (managers' transactions arrive in January 2028), and we plan to add it once it is available.
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