# Magnite, Inc.
> Magnite · MGNI · New York, NY
- Profile type: Company
- Profile status: comprehensive
- Last updated: 2026-05-04T00:00:00.000Z
- Canonical URL: https://thestateofstreaming.com/companies/magnite/
- Also known as: Magnite, MGNI, Rubicon Project, SpotX, Telaria, SpringServe, The Rubicon Project
## Summary
Magnite, Inc. (NASDAQ: MGNI) is the largest independent sell-side platform (SSP) in CTV and programmatic advertising. Formed by the 2020 Rubicon Project–Telaria merger, it acquired SpotX ($1.17B) and SpringServe in 2021 and now operates two segments: Magnite Streaming (CTV SSP plus the SpringServe ad server) and Magnite DV+ (web and mobile). CTV crossed 50 percent of contribution ex-TAC in Q1 2026, making it definitionally a streaming-first business.

## Company facts

- Ticker: MGNI
- Founded: 2020
- Headquarters: New York, NY
- Domain: magnite.com
- CEO: michael barrett (https://thestateofstreaming.com/people/michael-barrett/)


## Latest metrics

- Revenue: Q4 2025 contribution ex-TAC of $195.1M (CTV $93.6M, DV+ $101.5M); Q1 2026 guided to $157M–$161M total contribution ex-TAC.
- As of: 2026-02-25
- Source: https://www.globenewswire.com/news-release/2026/02/25/3244987/0/en/Magnite-Reports-Fourth-Quarter-and-Full-Year-2025-Results.html


## Recent filings

- 2025-02-26 — 10-K (FY2024): Annual report for fiscal year 2024. CIK 0001595974. Accessed via SEC EDGAR; verify the most recent 10-K filing index for the canonical link and exhibits. (https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001595974&type=10-K&dateb=&owner=include&count=40)
- 2026-02-25 — 8-K (Q4 2025 results): Q4 2025 and full-year 2025 results plus initial Q1 2026 guidance. CTV contribution ex-TAC of $93.6M and total of $195.1M for Q4 2025; Q1 2026 CTV guide $81M–$83M (up 28–31 percent), DV+ guide $76M–$78M (down 6–8 percent), total $157M–$161M. (https://www.globenewswire.com/news-release/2026/02/25/3244987/0/en/Magnite-Reports-Fourth-Quarter-and-Full-Year-2025-Results.html)
- 2026-04-20 — 8-K (CFO retirement): Announces retirement of CFO David Day effective Sept. 30, 2026, with a special advisor role through May 31, 2027. Reaffirms Q1 and full-year 2026 guidance. (https://www.globenewswire.com/news-release/2026/04/20/3277488/0/en/Magnite-Announces-Retirement-of-CFO-David-Day.html)


## Key facts

- Magnite reports Q1 2026 results after market close on May 6, 2026, with a 4:30 p.m. ET conference call. Per Magnite Investor Relations, April 6, 2026. — Magnite Investor Relations: https://investor.magnite.com/news-releases/news-release-details/magnite-announce-first-quarter-2026-financial-results-may-6-2026
- Q1 2026 guidance, issued Feb. 25, 2026, calls for total contribution ex-TAC of $157M to $161M (up 8 to 10 percent), CTV of $81M to $83M (up 28 to 31 percent), and DV+ of $76M to $78M (down 6 to 8 percent) — the first quarter CTV is guided above 50 percent of the segment total at every corner of the range. — Magnite Q4 2025 results release: https://www.globenewswire.com/news-release/2026/02/25/3244987/0/en/Magnite-Reports-Fourth-Quarter-and-Full-Year-2025-Results.html
- Q4 2025 actuals were CTV $93.6M and total contribution ex-TAC $195.1M, putting CTV at 47.97 percent of the segment total — short of a majority by ~$2M. — Magnite Q4 2025 results release: https://www.globenewswire.com/news-release/2026/02/25/3244987/0/en/Magnite-Reports-Fourth-Quarter-and-Full-Year-2025-Results.html
- Magnite reaffirmed Q1 and full-year 2026 guidance in its April 20, 2026 announcement of CFO David Day's retirement, effective Sept. 30, 2026, with Day continuing as a special advisor through May 31, 2027. — Magnite CFO retirement release: https://www.globenewswire.com/news-release/2026/04/20/3277488/0/en/Magnite-Announces-Retirement-of-CFO-David-Day.html
- Magnite is a founding member of the IAB Tech Lab Programmatic Governance Council, launched April 21, 2026, alongside Dentsu, Omnicom Media Group, WPP, Disney, PubMatic, Hearst, News Corp, Yahoo, Amazon Ads, The Trade Desk, Raptive, and Mediavine. — IAB Tech Lab launch release (PR Newswire): https://www.prnewswire.com/news-releases/iab-tech-lab-launches-industry-council-to-address-transparency-in-200b-us-programmatic-ad-market-302748778.html
- AMC Networks on April 15, 2026 routed its unified linear and streaming inventory programmatically through Magnite's ClearLine — the most recent named addition to the streaming-supply roster. — Magnite-issued release (April 15, 2026): https://www.stocktitan.net/news/MGNI/amc-global-media-s-unified-streaming-and-linear-programmatic-buying-qca057r2zhlw.html
- The April 23, 2025 next-generation SpringServe release — combining the streaming SSP with the streaming ad server — named Disney Advertising, LG Ad Solutions, Paramount, Roku, Samsung, and Warner Bros. Discovery among initial clients. — Magnite SpringServe next-generation release: https://www.globenewswire.com/news-release/2025/04/23/3066336/0/en/Magnite-Unveils-Next-Generation-of-SpringServe-Combining-Its-Streaming-Ad-Server-and-SSP.html
- Magnite was formed in April 2020 via the merger of Rubicon Project (founded 2007) and Telaria; ticker changed to MGNI on April 6, 2020. Magnite acquired SpotX from RTL Group for $1.17B (closed April 30, 2021) and SpringServe for $31M cash plus stock (closed July 1, 2021). — Magnite — SpotX acquisition close release: https://investor.magnite.com/news-releases/news-release-details/magnite-completes-acquisition-spotx
- Post-Q4 2025 print sell-side price targets for Magnite span $16 (Scotiabank) to $39 (Rosenblatt Securities, Buy), a $23 spread on the same underlying CTV growth trajectory. — DefenseWorld, reporting on Rosenblatt Securities: https://www.defenseworld.net/2026/02/27/magnite-nasdaqmgni-receives-buy-rating-from-rosenblatt-securities.html
- On the Q4 2025 earnings call, CEO Michael Barrett said "CTV is now larger than DV+, making streaming the majority of our business," and named LG Ads, Netflix, Paramount, Roku, Vizio, Walmart, and Warner Bros. Discovery as growth contributors. — Magnite Q4 2025 earnings call transcript (The Motley Fool): https://www.fool.com/earnings/call-transcripts/2026/02/25/magnite-mgni-q4-2025-earnings-call-transcript/


## Related

- michael barrett (CEO) — https://thestateofstreaming.com/people/michael-barrett/
- david day (CFO (retiring Sept. 30) — https://thestateofstreaming.com/people/david-day/
- magnite streaming (CTV SSP product line) — https://thestateofstreaming.com/products/magnite-streaming/
- springserve (streaming ad-server arm (acquired 2021)) — https://thestateofstreaming.com/products/springserve/
- clearline (DSP-light tool for buyers) — https://thestateofstreaming.com/products/clearline/
- magnite dv plus (web and mobile display/video segment) — https://thestateofstreaming.com/products/magnite-dv-plus/
- pubmatic (peer independent SSP) — https://thestateofstreaming.com/companies/pubmatic/
- the trade desk (DSP partner) — https://thestateofstreaming.com/companies/the-trade-desk/
- amc networks (April 2026 ClearLine partnership) — https://thestateofstreaming.com/companies/amc-networks/
- amazon (DTE adopter / parallel programmatic-supply work) — https://thestateofstreaming.com/companies/amazon/
- disney (streaming-supply partner (SpringServe initial client)) — https://thestateofstreaming.com/companies/disney/
- roku (streaming-supply partner (SpringServe initial client)) — https://thestateofstreaming.com/companies/roku/
- warner bros discovery (streaming-supply partner) — https://thestateofstreaming.com/companies/warner-bros-discovery/
- netflix (named CTV growth contributor (Q4 2025)) — https://thestateofstreaming.com/companies/netflix/
- paramount skydance (streaming-supply partner) — https://thestateofstreaming.com/companies/paramount-skydance/
- lg ad solutions (streaming-supply partner) — https://thestateofstreaming.com/companies/lg-ad-solutions/
- samsung (SpringServe initial client) — https://thestateofstreaming.com/companies/samsung/
- vizio (named CTV growth contributor (Q4 2025)) — https://thestateofstreaming.com/companies/vizio/
- walmart (named CTV growth contributor (Q4 2025)) — https://thestateofstreaming.com/companies/walmart/
- iab tech lab (PGC founding member (April 21) — https://thestateofstreaming.com/companies/iab-tech-lab/


## External coverage

- Magnite, Inc.: Magnite Investor Relations (https://investor.magnite.com/)
- U.S. Securities and Exchange Commission: Magnite 10-K filings — SEC EDGAR (https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001595974&type=10-K&dateb=&owner=include&count=40)
- 2026-02-25 — Magnite (GlobeNewswire): Magnite Reports Fourth Quarter and Full Year 2025 Results (https://www.globenewswire.com/news-release/2026/02/25/3244987/0/en/Magnite-Reports-Fourth-Quarter-and-Full-Year-2025-Results.html)
- 2026-04-20 — Magnite (GlobeNewswire): Magnite Announces Retirement of CFO David Day (https://www.globenewswire.com/news-release/2026/04/20/3277488/0/en/Magnite-Announces-Retirement-of-CFO-David-Day.html)
- 2025-04-23 — Magnite (GlobeNewswire): Magnite Unveils Next-Generation SpringServe — Combining Streaming Ad Server and SSP (https://www.globenewswire.com/news-release/2025/04/23/3066336/0/en/Magnite-Unveils-Next-Generation-of-SpringServe-Combining-Its-Streaming-Ad-Server-and-SSP.html)
- AdExchanger: AdExchanger coverage — Magnite Q4 2025 earnings (https://www.adexchanger.com/online-advertising/magnite-q4-2025-earnings/)
- Digiday: Digiday coverage tag — Magnite (https://digiday.com/marketing/magnite-ctv-ssp-streaming/)
- Adweek: Adweek coverage tag — Magnite (https://www.adweek.com/programmatic/tag/magnite/)

## Profile
Magnite, Inc. (NASDAQ: MGNI) is the largest independent sell-side advertising platform on the open web and the largest independent CTV SSP. The current company is the product of four years of structural M&A: the April 2020 Rubicon Project–Telaria merger that created Magnite, the April 2021 acquisition of SpotX from RTL Group (~$1.17B), and the July 2021 acquisition of SpringServe (~$31M cash plus stock). The combined entity reports across two operating segments — Magnite Streaming (the CTV SSP plus the SpringServe ad server) and Magnite DV+ (web and mobile display and video).

The May 6, 2026 print is the structural inflection. Management's own Q1 guidance, [issued Feb. 25 and reaffirmed on April 20](https://www.globenewswire.com/news-release/2026/04/20/3277488/0/en/Magnite-Announces-Retirement-of-CFO-David-Day.html), puts CTV contribution ex-TAC above 50 percent of the segment total at every corner of the range — the first quarter Magnite would be definitionally a CTV-first business. The April 20 release packaged that guidance reaffirmation with the announcement that CFO David Day will retire effective Sept. 30, 2026 and continue as a special advisor through May 31, 2027.

Surrounding the print: the [SpringServe next-generation release](https://www.globenewswire.com/news-release/2025/04/23/3066336/0/en/Magnite-Unveils-Next-Generation-of-SpringServe-Combining-Its-Streaming-Ad-Server-and-SSP.html) (April 2025) consolidated the streaming SSP and ad server into a single client surface for Disney Advertising, LG Ad Solutions, Paramount, Roku, Samsung, and Warner Bros. Discovery; AMC Networks routed unified linear and streaming inventory through ClearLine on April 15, 2026; and on April 21, Magnite took a founding seat on the IAB Tech Lab Programmatic Governance Council alongside The Trade Desk, PubMatic, Amazon Ads, Disney, and the major holding-company agencies.

For full editorial coverage, see [The State of Streaming's Magnite Q1 2026 preview](/advertising-adtech/2026/04/magnite-q1-2026-ctv-crossover-preview/) (April 25, 2026) and [the IAB Tech Lab PGC launch analysis](/advertising-adtech/2026/04/iab-tech-lab-pgc-leap-launch/) (April 26, 2026).
## Coverage on The State of Streaming
- [Omnicom Says It's Cutting Out the Ad-Tech Middlemen. The Holdco-Direct Era Just Went Live.](https://thestateofstreaming.com/advertising-adtech/2026/05/omnicom-ai-agent-adtech-disintermediation/) — 2026-05-04
- [PubMatic's AgenticOS Hits 1,000 Deals as Creative Suite Goes Live](https://thestateofstreaming.com/advertising-adtech/2026/05/pubmatic-agenticos-creative-suite-launch/) — 2026-05-03
- [Amazon Wires the Identity Stack Together Before NewFronts](https://thestateofstreaming.com/advertising-adtech/2026/04/amazon-identity-stack-consolidation/) — 2026-04-26
- [DoubleVerify Earns First MRC Accreditation for TikTok Viewability](https://thestateofstreaming.com/measurement-data/2026/04/doubleverify-tiktok-mrc-accreditation/) — 2026-04-25
- [Netflix Authorizes $25B Buyback After $5.09B FCF Quarter](https://thestateofstreaming.com/platforms/2026/04/netflix-q1-2026-buyback-ad-tier/) — 2026-04-25

## Tags

- ad-tech
- ssp
- ctv
- independent-ssp
- public
- NASDAQ
- programmatic

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