# Sumsum

**Summary.** Sumsum is an agency. Based in Leuven. Founded in 2017. The team is around 6 FTE. Expertise: Website strategy & UX.

## Key facts

| Field | Value |
|---|---|
| Founded | 2017 |
| Location | Gaston Geenslaan 11/B4, 3001 Leuven |
| Website | https://www.sumsum.digital |
| LinkedIn | https://www.linkedin.com/company/sumsum-digital/ |
| Instagram | https://www.instagram.com/sumsum.digital |
| Company number | BE0671.584.745 |
| NACE main activity | 62100 - Ontwerpen van computerprogramma’s |
| Expertise | Website strategy & UX |
| Team (FTE) | 6,3 |

## What does Sumsum do?

Sumsum is een full-service bureau uit Heverlee, actief sinds 2017. De bezetting ligt rond 6 VTE. Het aanbod is gericht op ux/ui design. Sectoren waar het bureau vaak werkt: brede innovatie/digitale projecten.

## Where is Sumsum based?

Sumsum is based in Gaston Geenslaan 11/B4, 3001 Leuven, Belgium.

## What expertise does Sumsum have?

- Website strategy & UX

## Key financials

Source: NBB annual accounts. "/" means not filed (abbreviated format); FTE = average number of full-time equivalents.

| Year | Revenue | Gross margin | EBITDA | FTE |
|---|---|---|---|---|
| 2023 | € 2.426.310 | € 886.502 | € -20.706 | 14,1 |
| 2024 | € 2.499.787 | € 818.852 | € -166.582 | 13,8 |
| 2025 | € 1.570.980 | € 435.848 | € -22.674 | 6,3 |

## Frequently asked questions

**When was Sumsum founded?** In 2017.

**Where is Sumsum located?** In Leuven, Belgium.

**What is Sumsum specialised in?** Website strategy & UX.

**How big is Sumsum?** Around 6 full-time equivalents (financial year 2025).

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Factsheet published by IKAg. Figures from the annual accounts up to financial year 2025. Company data verified with the CBE on 2026-10-13. Canonical page: https://www.ikag.be/en/factsheets/sumsum