# Companies using Sizmek

1,375 companies use Sizmek, based on their job posts and their employees' public profiles. From October 2025 to August 2026, 363 job posts named it. Performance Marketing roles mention it most.

Data as of November 9, 2026. Source: Sumble.

## Which companies name Sizmek in the most job posts?

GroupM has posted more jobs naming Sizmek than any other company: 235. All five companies are in Professional Services.

| Company | Job posts | People | Recent job post |
|---|---:|---:|---|
| [GroupM](https://sumble.com/orgs/groupm) | 235 | 14 | "Ad Tech Ops “owns” the campaign setup process only within ad server platforms (building, trafficking, creative QA, activation, and reporting setup within CM360, Adform, Sizmek, Flashtalking, etc.)." (AdTech Operations Manager, Jul 23, 2025) |
| [dentsu](https://sumble.com/orgs/dentsu) | 138 | 29 | "CM360 campaign trafficking, Sizmek, IAS, campaign trackers and digital reporting" (Senior Executive – Digital Ad Operations , Oct 9, 2026) |
| [Annalect India](https://sumble.com/orgs/annalect-india) | 97 | 5 | "Setup and execute digital media campaigns using ad servers like Google Campaign Manager, Sizmek, Adform and Flashtalking etc." (adops - analyst, Sep 23, 2025) |
| [Publicis Groupe](https://sumble.com/orgs/publicis-groupe) | 86 | 32 | "Robust experience with at least one major third-party ad server with site-side tracking (like DoubleClick, Atlas, or Sizmek)" (Manager, Analytics, Dec 23, 2025) |
| [WPP Media](https://sumble.com/orgs/wpp-media) | 71 | 59 | "Programmatic & Adtech Mastery: Advanced expertise across DSPs and buying platforms (DV360, Xandr, Taboola, Sizmek, etc.)." (Media Solutions Growth, Director, Nov 4, 2026) |

## Is hiring for Sizmek growing?

Job posts mentioning Sizmek went from 0.15 to 0.17 in every 10,000 job posts, comparing March to May with June to August 2026. One company accounts for most of that change.

| Month | Job posts naming it | All job posts | Per 10,000 job posts |
|---|---:|---:|---:|
| Oct 2025 | 37 | 1,413,673 | 0.26 |
| Nov 2025 | 55 | 1,822,119 | 0.30 |
| Dec 2025 | 21 | 1,236,103 | 0.17 |
| Jan 2026 | 43 | 1,828,002 | 0.24 |
| Feb 2026 | 30 | 1,856,647 | 0.16 |
| Mar 2026 | 35 | 1,850,711 | 0.19 |
| Apr 2026 | 22 | 1,728,886 | 0.13 |
| May 2026 | 25 | 1,821,509 | 0.14 |
| Jun 2026 | 32 | 1,909,496 | 0.17 |
| Jul 2026 | 30 | 1,815,180 | 0.17 |
| Aug 2026 | 33 | 1,835,698 | 0.18 |

## How many companies named Sizmek in a job post for the first time in recent months?

Sizmek showed up in job posts at 8 companies for the first time from June to August 2026, and 10 in the three months before. From October 2025 to August 2026, 35 companies named it in a job post for the first time.

| Period | Companies naming it in a job post for the first time |
|---|---:|
| March to May 2026 | 10 |
| June to August 2026 | 8 |
| October 2025 to August 2026 | 35 |

Companies whose first job post naming it appeared in that period. Recruiters, staffing firms and job boards are left out.

## How do we know which companies use Sizmek?

We found 1,375 companies that use Sizmek, 925 of them through employees' profiles alone. 105 show up in both job posts and employees' profiles.

| How we know | Companies | Share |
|---|---:|---:|
| Job posts name Sizmek | 450 | 33% |
| Employees' profiles list Sizmek | 925 | 67% |

## What size are the companies that use Sizmek?

Sizmek's users look like the average tech page by size. The largest group is companies with 50 to 999 employees, at 42%. 263 of its companies have more than 5,000 employees.

| Size | Share | Typical tech page |
|---|---:|---:|
| Under 50 employees | 21% | 22% |
| 50 to 999 | 42% | 38% |
| 1,000 to 5,000 | 18% | 17% |
| Over 5,000 | 19% | 23% |

## Where are Sizmek companies based?

Beyond the United States (42%), Sizmek is unusually common in Spain, at 4.9% of its companies. The United Kingdom is second, at 8.4%.

| Country | Companies | Share | Typical tech page |
|---|---:|---:|---:|
| United States | 550 | 42% | 43% |
| United Kingdom | 110 | 8.4% | 6.4% |
| Australia | 74 | 5.7% | 2.2% |
| Spain | 64 | 4.9% | 1.8% |
| India | 61 | 4.7% | 6.9% |
| France | 57 | 4.4% | 4.6% |

## Which teams work with Sizmek?

Sizmek sits mostly with ad operations teams (30 companies). Analytics teams are second, at 9 companies, and digital teams third, at 8.

| Team | Companies |
|---|---:|
| Ad operations | 30 |
| Analytics | 9 |
| Digital | 8 |
| Account management | 7 |
| Adops | 7 |
| Advertising operations | 7 |

## Which roles mention Sizmek most?

No single role dominates for Sizmek; Performance Marketing leads with 12% of the job posts. Account Manager is second, at 12%.

| Role | Share | Oct 2025 to Aug 2026 | Mar to May 2026 | Jun to Aug 2026 |
|---|---:|---:|---:|---:|
| Performance Marketing | 12% | 44 | 10 | 13 |
| Account Manager | 12% | 42 | 4 | 14 |
| Marketing | 8.8% | 32 | 5 | 6 |
| Digital Marketing | 6.9% | 25 | 2 | 6 |
| Sales | 6.3% | 23 | 7 | 4 |
| Marketing Analyst | 5% | 18 | 4 | 5 |

## Which companies started naming Sizmek in job posts recently?

11 companies with 50 or more employees picked up Sizmek in their job posts from April to August 2026. Zoo Media leads the new commercial companies, with 4 job posts from April to August.

| Group | Company | Job posts, April to August 2026 |
|---|---|---:|
| Commercial | [Zoo Media](https://sumble.com/orgs/zoo-media) | 4 |
| Commercial | [Maker Lab](https://sumble.com/orgs/maker-lab) | 3 |
| Commercial | [Catalina USA](https://sumble.com/orgs/catalina) | 2 |
| Commercial | [Genius](https://sumble.com/orgs/genius-community) | 2 |
| Commercial | [Omnicom Production Latam](https://sumble.com/orgs/flare-bbdo-bogota) | 1 |

Companies that named Sizmek in a job post for the first time between April and August 2026, ranked by their job posts in those months. AI-native companies get a group of their own, whatever their size. Recruiters and job boards are left out.

## What else do Sizmek companies use?

The tool most tied to Sizmek is Integral Ad Science. 13% of Sizmek companies use it, 212 times the usual rate for their size. Among the tools listed here, Google DoubleClick is the most widely used, at 32% of Sizmek companies.

| Tool | Companies | Also name it | Typical | Times as common |
|---|---:|---:|---:|---:|
| Integral Ad Science | 48 | 13% | 0.06% | 212 times |
| Flashtalking | 98 | 27% | 0.13% | 206 times |
| Innovid | 82 | 23% | 0.12% | 182 times |
| DoubleVerify | 111 | 31% | 0.2% | 153 times |
| MediaMath | 55 | 15% | 0.11% | 134 times |
| OpenX | 25 | 6.9% | 0.05% | 134 times |
| Amazon Search | 20 | 5.6% | 0.04% | 124 times |
| Google DoubleClick | 114 | 32% | 0.29% | 111 times |

Shares are out of the 360 companies whose job posts name Sizmek, not counting firms whose job posts name almost every technology.

## About this data

Sumble built this page. Sumble gives sales, marketing and other GTM teams technographics and hiring signals for the companies they sell to: the technologies each company uses, which teams are hiring and for what, and who reports to whom. That helps a team know who to contact, why now, and what to say.

Sumble covers more than 3.6 million companies, 93 million job posts collected since 2022 and 194 million employee profiles, and tracks more than 37,000 technologies. It finds which technologies a company uses by reading its job posts and its employees' public profiles.

Sumble has a free plan, and the same data is available through its API and MCP server.

A company counts when its own job posts or its employees' public profiles name the technology. Hiring is that technology's share of all job posts collected each month. Quotes are copied word for word from the companies' job posts.

Every figure on this page comes from Sumble's own analysis, and you won't find it outside Sumble.