HORIZON-CL4-2026-04-DATA-03
Open Internet Stack Support for Scale (CSA) -
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HORIZON-CL4-2026-04-DATA-02
Open Internet Stack Sovereign Solutions (RIA)MOTIVATION HORIZON-CL4-2026-04-DATA-02 and HORIZON-CL4-2026-04-DATA-03 are complementary call topics from the Open Internet Stack initiative started in the work programme 2025. Synergies are consequently encouraged.
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HORIZON-CL4-2026-04-HUMAN-02
Web 4.0 architectural framework and Open Internet Stack applications for virtual worlds (RIA)MOTIVATION HORIZON-CL4-2026-04-HUMAN-02 and HORIZON-CL4-2026-04-DATA-03 are complementary call topics from the Open Internet Stack initiative started in the work programme 2025. Synergies are consequently encouraged.
Call text (as on F&T portal)
View on F&T portalExpected Outcome:
Projects results are expected to contribute to all the following outcomes:
- A common approach and hub for cataloguing, packaging, reviewing and validating Open Internet Stack components and projects.
- Long term viability by advising on Open Source sustainability and maintenance models including business and foundation; Promotion of the EU and Associated Countries as ideal location for Open Source Foundation sieges.
- A common branding, marketing, training and communication plan ensuring consistent perception and scale-up.
A close interleave with policy development through a dedicated policy sandbox.
Scope:
Applicants should devise a plan for:
- Cataloguing solutions in a structured and easy to discover way
- Performing security and accessibility audits on the selected solutions under the Open Internet Stack.
- Screening and selecting European funded Open Source projects, including by exploring the relevant Horizon Europe programmes, and devising a strategy for the Open Internet Stack to become a central hub for those solutions.
- Establishing links and mutual support with national, multi-country and pan-European initiatives supporting Open Source sovereign solutions.
- Advising on sustainability models (both for and non-for profit), on standardisation, licencing schemes, or localisation/internationalisation
- Elaborating a common branding with associated marketing and communication tool
- Developing training material on these solutions that stresses their value in terms of EU legislation compliance (GDRP, DSA/DMA, CRA…), security (e.g. reference to security audits, list of dependencies), use cases, funding/business model, deployment requirements (server side, user side), link to repository and community resource (maintainers, community manager, discussion board…). Training material will be tailored to each target audience: Operators of infrastructure, Integrators, Government & verticals IT, end users.
- Implementing measures to identify/attract technology adopters (e.g. services providers, integrators, OSPOs in governments/verticals) to become promoters of these technologies.
- Developing sandbox tools for ensuring smooth compliance-by-design of the Open Internet Stack with relevant existing or futures EU policies.
- Supporting Open Source awards scheme and sustainability models after the action is finished.
We consider that proposals with an overall duration of typically 36 months would allow these outcomes to be addressed appropriately. Nonetheless, this does not preclude submission and selection of proposals requesting other durations.
Beneficiaries that intend to transfer ownership or grant an exclusive licence must formally notify the granting authority (i.e. DG-CNECT and HaDEA) before the intended transfer or licensing takes place and the granting authority may up to four years after the end of the action object to a transfer of ownership or the exclusive licensing of results.
News flashes
EVALUATION RESULTS
Call HORIZON-CL4-2026-04
Published: 12.12.2025
Deadline: 15.04.2026
Available budget: EUR 221,800,000.00
The results of the evaluation for each topic are as follows:
HORIZON-CL4-2026-04
DATA-02
DATA-03
DATA-06
EMERGING-01
EMERGING-08
EMERGING-09
Number of proposals submitted (including proposals transferred from or to other calls)
31
6
63
4
8
41
Number of inadmissible proposals
0
0
2
1
0
0
Number of ineligible proposals
1
2
3
1
3
2
Number of above-threshold proposals
24
2
39
2
3
30
Total budget requested for above-threshold proposals
222,798,016.25 €
7,993,073.04 €
538,094,514.11 €
33,999,387.25 €
53,990,531.25 €
173,178,667.04 €
Number of proposals retained for funding
3
1
3
1
1
1
Number of proposals in the reserve list
1
1
1
1
1
1
Funding threshold [1]
14.00
14.00
14.50
12.50
14.50
14.50
Number of proposals with scores lower or equal to 15 and higher or equal to 14
3
1
8
0
1
2
Number of proposals with scores lower than 14 and higher or equal to 13
7
0
5
0
1
3
Number of proposals with scores lower than 13 and higher or equal to 10
14
1
26
2
1
25
HORIZON-CL4-2026-04
EMERGING -14
EMERGING-15
EMERGING-17
EMERGING-19
HUMAN-01
HUMAN-02
Number of proposals submitted (including proposals transferred from or to other calls)
1
2
1
18
105
32
Number of inadmissible proposals
0
1
0
0
1
0
Number of ineligible proposals
0
0
0
2
0
3
Number of above-threshold proposals
1
1
1
12
81
19
Total budget requested for above-threshold proposals
3,043,282.50 €
999,976.25 €
1,163,306.74 €
179,979,870.75 €
387,981,592.72 €
126,943,323.25 €
Number of proposals retained for funding
1
1
1
3
6
2
Number of proposals in the reserve list
0
0
0
3
2
1
Funding threshold [1]
11.50
13.50
12.50
13.50
14.50
13.50
Number of proposals with scores lower or equal to 15 and higher or equal to 14
0
0
0
2
12
1
Number of proposals with scores lower than 14 and higher or equal to 13
0
1
0
1
20
3
Number of proposals with scores lower than 13 and higher or equal to 10
1
0
1
9
49
15
[1] Proposals with the same score were ranked according to the priority order procedure set out in the call conditions (for HE, in the General Annexes to the Work Programme or specific arrangements in the specific call/topic conditions). For HE, to determine the ranking for ‘Innovation actions’, the score for ‘Impact’ is given a weight of 1.5.
Summary of observer report:
The two independent observers were tasked by the EC services to follow the evaluation processes of call HORIZON-CL4-2026-04 with respect to their conduct, transparency, and fairness, and to provide recommendations for process improvement. This Observers’ Report consolidates their observations and recommendations. Based on the observed Consensus Meetings and Panel Meetings, the evaluation procedures for all topics were carried with transparency, efficiency, fairness, consistency, impartiality with homogenous criteria in compliance with the applicable evaluation rules for each stage of the selection exercise (Individual Evaluation, Consensus Meetings, Quality Check, Cross-reading, Panel Meeting and Final Ranking for funding). The evaluation processes were carried out in full accordance with the Horizon Europe evaluation rules and the provided Digital Europe Programme evaluation briefings. The Call with 12 topics received 312 proposals, where 5 were inadmissible, 17 ineligible and 0 withdrawn. The number of proposals per topic varied from 1 to 105. Proposals were evaluated by 218 experts, with a satisfactory gender balance (44,5% female; 55,5% male). The majority of experts were from EU Member States and a small number from associated countries. Sixteen invited experts declined due to conflict of interest or other reasons. In conclusion, the overall assessment of all submitted proposals were executed in full transparency and compliance with the Horizon Europe applicable rules in a fair and impartial manner to select the best proposals for funding according to the topics’ specifications and expected results. The observers’ conclusion is that the scientific evaluations have been carried out in a just, transparent, and unbiased manner based on the Horizon Europe evaluation rules.
We recently informed the applicants about the evaluation results for their proposals.
For questions, please contact the Research Enquiry Service.
PROPOSAL NUMBERS
Call HORIZON-CL4-2026-04 has closed on 15.04.2026
312 proposals have been submitted.
The breakdown per topic is:
HORIZON-CL4-2026-04-DATA-02
31
HORIZON-CL4-2026-04-DATA-03
6
HORIZON-CL4-2026-04-DATA-06
63
HORIZON-CL4-2026-04-DIGITAL-EMERGING-14
1
HORIZON-CL4-2026-04-DIGITAL-EMERGING-15
2
HORIZON-CL4-2026-04-DIGITAL-EMERGING-17
1
HORIZON-CL4-2026-04-HUMAN-01
105
HORIZON-CL4-2026-04-HUMAN-02
32
HORIZON-CL4-2026-04-DIGITAL-EMERGING-01
4
HORIZON-CL4-2026-04-DIGITAL-EMERGING-08
8
HORIZON-CL4-2026-04-DIGITAL-EMERGING-09
41
HORIZON-CL4-2026-04-DIGITAL-EMERGING-19
18
Evaluation results are expected to be communicated in July 2026.
If your lump sum budget contains any cost items in cost category C and/or D, please make sure to justify these items in the ‘Any comments’ sheet of the Excel detailed lump sum budget table.
The reason is that we simplified the proposal template, removing this information from Part B and bringing it closer to the relevant budget items.
Specifically, you must include justification in the ‘Any comments’ sheet if you are in any of the following situations:
- If the sum of the costs for ’travel and subsistence’, ‘equipment’, and ‘other goods, works and services’ (i.e. the purchase costs) exceeds 15% of the personnel costs for a participant. If this is the case, justify the most expensive cost item(s) up to the level that the remaining costs are below 15% of personnel costs.
- If other cost categories (e.g. internally invoiced goods and services) are used.
- If in-kind contributions are used (non-financial resources made available free of charge by third parties, which must be included as direct costs in the corresponding cost category, e.g. personnel costs or purchase costs for equipment).
Opening date: 2026-01-15 (7 months ago)
Closing date: 2026-04-15 (4 months ago)
Procedure: single-stage
Budget: 4,000,000
Expected grants: 1
Contribution: 4,000,000 - 4,000,000
This call topic has been appended 4 times by the EC with news.
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2026-08-23
evaluation results call horizon-cl4-2026... -
2026-08-23
proposal numbers call horizon-cl4-2026-... -
2026-08-23
if your lump sum budget contains any cos... -
2026-08-23
the submission session is now available...
HORIZON-CL4-2026-04
Call topics are often grouped together in a call. Sometimes this is for a thematic reason, but often it is also for practical reasons.
There are 14 other topics in this call:
- HORIZON-CL4-2026-04-DATA-02
- HORIZON-CL4-2026-04-DATA-06
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-01
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-08
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-09
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-11
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-12
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-14
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-15
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-17
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-18
- HORIZON-CL4-2026-04-DIGITAL-EMERGING-19
- HORIZON-CL4-2026-04-HUMAN-01
- HORIZON-CL4-2026-04-HUMAN-02
Showing the latest information. Found 7 versions of this call topic in the F&T portal.
Information from
- 2026-08-21_06-45-42
- 2026-04-16_06-32-55
- 2026-04-10_06-32-58
- 2026-03-03_06-32-36
- 2026-02-18_06-32-03
- 2026-01-15_06-30-55
- 2025-12-16_06-30-53
Check the differences between the versions.
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