Arthur AI
Agent security and governance platform that discovers AI agents across an enterprise, enforces runtime guardrails and policies, and monitors and evaluates ML and generative-AI applications, with an open-source evals engine.
Total funding$62.7M
Valuation—
Employees—
Founded2019
HeadquartersNew York, USA
New York, USAStatusPrivate
Products
Selected offerings — the AI products recorded here, not the vendor's full catalogue.
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AI observability platform monitoring model performance, bias, drift and behavior for ML and generative AI/agentic applications in production, built on an open-source evals engine.
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Open-source, real-time evaluation engine for generative AI and traditional ML models: instant analysis of outputs, active guardrails, and built-in plus customizable metrics, run inside a user's own infrastructure independently of the hosted Arthur platform.
Inside Arthur AI Platform
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Module within the Arthur AI Platform providing security scanning, policy enforcement and governance controls specifically for autonomous agent deployments (tool-use permissions, action auditing, risk scoring).
Similar products 46
No sourced competitor yet: no filing, vendor document or measured-market report read so far names a rival for this company, so none is asserted. The companies below are the closest by what their products do.
FA
Fiddler AIPrivate · $100M raisedArthur and Fiddler AI both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareB
BraintrustPrivate · $125M raisedArthur and Braintrust both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).1 of 3 capabilitiesShared product typeCompareD
DeepchecksAbsorbedArthur and Deepchecks LLM Evaluation both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Deepchecks is absorbed, with no independent scale.1 of 3 capabilitiesShared product typeCompareG
GalileoAcquired ($68M deal)Arthur and Galileo both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Galileo is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareAA
Arize AIPrivateArthur Engine and Arize Phoenix both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Arize AI's scale not recorded.2 of 3 capabilitiesShared product typeCompareCM
Comet MLPrivate · $70M raisedArthur and Comet Model Production Monitoring both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (early-stage private).1 of 3 capabilitiesShared product typeSame scale bandCompareH
HeliconeAcquiredArthur and Helicone both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Helicone is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareL
LangfuseAcquiredArthur and Langfuse both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareD
DatadogPublic · $84.9BArthur Engine and Agent Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareD
DatabricksPrivate · $190BArthur and Agent Bricks both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareAA
Automation AnywherePrivateArthur Agent Security & Governance and AI Agent Studio do comparable work on guardrails and safety; Automation Anywhere's scale not recorded.3 of 3 capabilitiesShared product typeCompareW&
Weights & BiasesAcquiredArthur Engine and W&B Weave both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Weights & Biases is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareC
ClickHousePrivate · $1.1B raisedArthur and ClickStack both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareS
SplunkAcquiredArthur and Splunk Observability Cloud both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Splunk is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareT
TuringPrivate · $2.2BArthur Agent Security & Governance and Turing Intelligence Platform do comparable work on guardrails and safety; similar scale (private); ships agent platform and data service rather than the same layer.3 of 3 capabilitiesDifferent layerCompareL
LangChainPrivate · $160M raisedArthur and LangSmith both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareRA
Resemble AIPrivateArthur Agent Security & Governance and Resemble Signal do comparable work on guardrails and safety; Resemble AI's scale not recorded.1 of 3 capabilitiesShared product typeCompareD
DataikuPrivate · $3.7BArthur and Dataiku Agent Hub both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareE
ElasticPublic · $10.2BArthur and Elastic LLM Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).2 of 3 capabilitiesShared product typeCompareS
SAPPublic · $256.3BArthur and SAP AI Agent Hub both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareHC
Huawei CloudPrivateArthur Agent Security & Governance and Content Moderation do comparable work on guardrails and safety; Huawei Cloud's scale not recorded.1 of 3 capabilitiesShared product typeCompareI
IBMPublic · $216.6BArthur and IBM watsonx.governance both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareIT
Invisible TechnologiesPrivate · $144M raisedArthur and Synapse both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareM
MicrosoftPublic · $3.7TArthur and Observability in Foundry Control Plane both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareZ
ZscalerPublic · $30.5BOverlaps on evaluation and observability and guardrails and safety; similar scale (public).2 of 3 capabilitiesShared product typeCompareW
WorkdayPublic · $49.3BArthur Agent Security & Governance and Agent System of Record do comparable work on guardrails and safety; similar scale (public).3 of 3 capabilitiesShared product typeCompareC
CoreWeavePublic · $48.5BArthur and CoreWeave ARIA both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).1 of 3 capabilitiesShared product typeCompareC
CognigyAcquiredArthur and Cognigy AI Ops Center both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Cognigy is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareG
Glean (Glean Technologies)Private · $7.2BArthur Agent Security & Governance and Glean AI Gateway do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareW
WriterPrivate · $1.9BArthur Agent Security & Governance and WRITER AI Studio do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareHA
Hume AIPrivateArthur and Kairos Platform both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Hume AI's scale not recorded.1 of 3 capabilitiesShared product typeComparePA
Palo Alto NetworksPublic · $302.9BArthur Agent Security & Governance and Prisma AIRS AI Gateway do comparable work on guardrails and safety; similar scale (public).3 of 3 capabilitiesShared product typeCompareY
Yellow.aiPrivateOverlaps on agent orchestration and evaluation and observability; Yellow.ai's scale not recorded.2 of 3 capabilitiesShared product typeCompareB
BroadcomPublic · $1.7TArthur Agent Security & Governance and AgentMinder do comparable work on guardrails and safety; similar scale (public).1 of 3 capabilitiesShared product typeCompareS
SentinelOnePublic · $7.5BArthur Agent Security & Governance and Prompt Security do comparable work on guardrails and safety; similar scale (public).1 of 3 capabilitiesShared product typeCompareB
ByteDancePrivateArthur and Coze Loop both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; ByteDance's scale not recorded.2 of 3 capabilitiesShared product typeCompareN
NVIDIAPublic · $5.1TArthur and NVIDIA NeMo both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareA
AnthropicPrivate · $965BArthur Agent Security & Governance and Claude Security do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareS
SierraPrivate · $15.8BArthur and Insights both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareH
HiddenLayerPrivate · $50M raisedArthur Agent Security & Governance and HiddenLayer AI Discovery do comparable work on guardrails and safety; same layer and the same scale band (early-stage private).2 of 3 capabilitiesShared product typeSame scale bandCompareVS
Verint SystemsAcquiredArthur and Verint Quality Bot both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Verint Systems is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareJ
JasperPrivateArthur Agent Security & Governance and Jasper Brand IQ do comparable work on guardrails and safety; Jasper's scale not recorded.2 of 3 capabilitiesShared product typeCompareL
LivePersonAcquiredOverlaps on evaluation and observability; LivePerson is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareD
DecagonPrivate · $4.5BArthur and Experiments both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareM
MercorPrivate · $20BArthur and Mercor Enterprise Evals both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private); ships data service rather than the same layer.1 of 3 capabilitiesDifferent layerCompareH
HaptikAcquired ($112M deal)Arthur and Haptik Agent Analytics both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Haptik is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompare
Fiddler AIPrivate · $100M raisedArthur and Fiddler AI both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareBBraintrustPrivate · $125M raisedArthur and Braintrust both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).1 of 3 capabilitiesShared product typeCompareDDeepchecksAbsorbedArthur and Deepchecks LLM Evaluation both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Deepchecks is absorbed, with no independent scale.1 of 3 capabilitiesShared product typeCompareGGalileoAcquired ($68M deal)Arthur and Galileo both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Galileo is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareAAArize AIPrivateArthur Engine and Arize Phoenix both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Arize AI's scale not recorded.2 of 3 capabilitiesShared product typeCompareCMComet MLPrivate · $70M raisedArthur and Comet Model Production Monitoring both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; same layer and the same scale band (early-stage private).1 of 3 capabilitiesShared product typeSame scale bandCompareHHeliconeAcquiredArthur and Helicone both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Helicone is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareLLangfuseAcquiredArthur and Langfuse both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareDDatadogPublic · $84.9BArthur Engine and Agent Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareDDatabricksPrivate · $190BArthur and Agent Bricks both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareAAAutomation AnywherePrivateArthur Agent Security & Governance and AI Agent Studio do comparable work on guardrails and safety; Automation Anywhere's scale not recorded.3 of 3 capabilitiesShared product typeCompareW&Weights & BiasesAcquiredArthur Engine and W&B Weave both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Weights & Biases is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareCClickHousePrivate · $1.1B raisedArthur and ClickStack both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareSSplunkAcquiredArthur and Splunk Observability Cloud both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Splunk is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareTTuringPrivate · $2.2BArthur Agent Security & Governance and Turing Intelligence Platform do comparable work on guardrails and safety; similar scale (private); ships agent platform and data service rather than the same layer.3 of 3 capabilitiesDifferent layerCompareLLangChainPrivate · $160M raisedArthur and LangSmith both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareRAResemble AIPrivateArthur Agent Security & Governance and Resemble Signal do comparable work on guardrails and safety; Resemble AI's scale not recorded.1 of 3 capabilitiesShared product typeCompareDDataikuPrivate · $3.7BArthur and Dataiku Agent Hub both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareEElasticPublic · $10.2BArthur and Elastic LLM Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).2 of 3 capabilitiesShared product typeCompareSSAPPublic · $256.3BArthur and SAP AI Agent Hub both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareHCHuawei CloudPrivateArthur Agent Security & Governance and Content Moderation do comparable work on guardrails and safety; Huawei Cloud's scale not recorded.1 of 3 capabilitiesShared product typeCompareIIBMPublic · $216.6BArthur and IBM watsonx.governance both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareITInvisible TechnologiesPrivate · $144M raisedArthur and Synapse both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).3 of 3 capabilitiesShared product typeCompareMMicrosoftPublic · $3.7TArthur and Observability in Foundry Control Plane both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareZZscalerPublic · $30.5BOverlaps on evaluation and observability and guardrails and safety; similar scale (public).2 of 3 capabilitiesShared product typeCompareWWorkdayPublic · $49.3BArthur Agent Security & Governance and Agent System of Record do comparable work on guardrails and safety; similar scale (public).3 of 3 capabilitiesShared product typeCompareCCoreWeavePublic · $48.5BArthur and CoreWeave ARIA both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).1 of 3 capabilitiesShared product typeCompareCCognigyAcquiredArthur and Cognigy AI Ops Center both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Cognigy is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareGGlean (Glean Technologies)Private · $7.2BArthur Agent Security & Governance and Glean AI Gateway do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareWWriterPrivate · $1.9BArthur Agent Security & Governance and WRITER AI Studio do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareHAHume AIPrivateArthur and Kairos Platform both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Hume AI's scale not recorded.1 of 3 capabilitiesShared product typeComparePAPalo Alto NetworksPublic · $302.9BArthur Agent Security & Governance and Prisma AIRS AI Gateway do comparable work on guardrails and safety; similar scale (public).3 of 3 capabilitiesShared product typeCompareYYellow.aiPrivateOverlaps on agent orchestration and evaluation and observability; Yellow.ai's scale not recorded.2 of 3 capabilitiesShared product typeCompareBBroadcomPublic · $1.7TArthur Agent Security & Governance and AgentMinder do comparable work on guardrails and safety; similar scale (public).1 of 3 capabilitiesShared product typeCompareSSentinelOnePublic · $7.5BArthur Agent Security & Governance and Prompt Security do comparable work on guardrails and safety; similar scale (public).1 of 3 capabilitiesShared product typeCompareBByteDancePrivateArthur and Coze Loop both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; ByteDance's scale not recorded.2 of 3 capabilitiesShared product typeCompareNNVIDIAPublic · $5.1TArthur and NVIDIA NeMo both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (public).3 of 3 capabilitiesShared product typeCompareAAnthropicPrivate · $965BArthur Agent Security & Governance and Claude Security do comparable work on guardrails and safety; similar scale (private).2 of 3 capabilitiesShared product typeCompareSSierraPrivate · $15.8BArthur and Insights both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareHHiddenLayerPrivate · $50M raisedArthur Agent Security & Governance and HiddenLayer AI Discovery do comparable work on guardrails and safety; same layer and the same scale band (early-stage private).2 of 3 capabilitiesShared product typeSame scale bandCompareVSVerint SystemsAcquiredArthur and Verint Quality Bot both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Verint Systems is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareJJasperPrivateArthur Agent Security & Governance and Jasper Brand IQ do comparable work on guardrails and safety; Jasper's scale not recorded.2 of 3 capabilitiesShared product typeCompareLLivePersonAcquiredOverlaps on evaluation and observability; LivePerson is acquired, with no independent scale.1 of 3 capabilitiesShared product typeCompareDDecagonPrivate · $4.5BArthur and Experiments both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private).2 of 3 capabilitiesShared product typeCompareMMercorPrivate · $20BArthur and Mercor Enterprise Evals both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; similar scale (private); ships data service rather than the same layer.1 of 3 capabilitiesDifferent layerCompareHHaptikAcquired ($112M deal)Arthur and Haptik Agent Analytics both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Haptik is acquired, with no independent scale.2 of 3 capabilitiesShared product typeCompareClosest alternatives are pairs a vendor page itself compares. Similar products are matched from what each product does; nothing in that group is asserted as a rivalry.
Sources
- Total funding
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Regulatory filing · 10 Aug 2026
Form D, already cited for headquarters: totalOfferingAmount 5,999,999 / totalAmountSold 2,668,819, first sale 2026-07-21. Raises the $60M PR Newswire (2022-09-27) floor to about $62.7M.
- Founded
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Regulatory filing · 2 Nov 2022
SEC Form D, accession 0001832497-22-000001, filed 2022-11-02: "Year of Incorporation: 2019" (Delaware). Corroborated by Arthur's own PR Newswire release (2022-09-27): "Arthur has raised more than $60M since its founding in 2019."
- Status
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Official documentation · 9 Sep 2026
Fetched 2026-09-09: live pricing page, blog publishing through a 2025 recap post, and an August 2026 SEC Form D shows continued fundraising activity. No acquisition or wind-down language.
- Description
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Official documentation · 24 Sep 2026
"Enterprise-grade agent security & governance." Arthur now sells itself first as agent security/governance (discovery, runtime guardrails), then observability and evals.
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