---
id: "concept-complementors"
type: "concept"
source_timestamps: ["¶2", "¶4", "¶5"]
tags: ["third-party-developers", "partnerships", "platform-economics"]
related: ["concept-ecosystem-synergies", "concept-ecosystem-clusters"]
definition: "Third-party developers, partners, and data providers whose products or services add value to a core platform or technology."
source_url: "https://hbr.org/2026/06/when-evaluating-an-ma-opportunity-consider-the-broader-digital-ecosystem"
source_title: "When Evaluating an M&A Opportunity, Consider the Broader Digital Ecosystem"
sources: ["ecosystem"]
sourceVaultSlug: "hbr-seg-ecosystem"
originDay: 11
articleStem: "hbr-cl-80-ma-digital-ecosystem"
sourceUrl: "https://hbr.org/2026/06/when-evaluating-an-ma-opportunity-consider-the-broader-digital-ecosystem"
sourceTitle: "When Evaluating an M&A Opportunity, Consider the Broader Digital Ecosystem"
---
# Complementors

**Definition:** Third-party developers, partners, and data providers whose products or services add value to a core platform or technology.

Complementors are the third-party entities — such as app developers, data providers, agent platforms, and integration partners — that build upon, connect to, or enhance a core platform's offerings. In digital ecosystems, complementors are the primary engine of expanded functionality and customer value.

Example: when [[entity-zendesk]] acquired [[entity-smooch]], the value wasn't just in Smooch's core code, but in the community of complementors who had built chatbots, automation workflows, and industry-specific applications on top of it. A platform's attractiveness is directly proportional to the **size, quality, and activity** of its complementor network.

Complementors are the actors whose voluntary participation makes [[concept-ecosystem-synergies]] real — and whose independence makes them uncontrollable, which is the crux of [[claim-ecosystem-value-external]]. They are more likely to build on a combined offering when it sits within their existing [[concept-ecosystem-clusters]] (shared languages, standards, architectures).

Understanding why complementors matter at all requires the background in [[prereq-platform-economics]].

**Enrichment note:** Complementors are not uniformly beneficial. Ecosystem-governance research warns that a richer complementor base can also increase complexity, create cannibalization, and reduce a firm's control over product direction — a tension only lightly treated in the source (see [[contrarian-ma-value-source]]).


## Related across articles
- [[concept-relational-capital]]
- [[concept-f2f-strategy]]