A marketplace for the Internet of Things acts as the corner stone of an IoT ecosystem, by matching the offer (i.e., data or functionalities) with the demand coming from IoT applications (e.g. analytics). In this paper, we present the semantic matching implemented on the public BIG IoT marketplace. Pre-print version.Many Internet of Things (IoT) platforms have come up and provide data and functionalities of things, e.g., ThingWorx, Xively or Siemens Mind-Sphere. In order to enable a vibrant and collaborative IoT ecosystem across these platforms, marketplaces are needed to enable providers to monetize the access to their platforms by consumers (e.g., applications or services). The BIG IoT project [1] offers such a marketplace and enables providers to register their IoT resources as offerings and consumers to formulate queries to discover these offerings. Once offerings and queries are registered on the BIG IoT marketplace, it is crucial to effectively support the matching between offerings and queries, so that consumers are reported which offerings suit their needs in near real-time.

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