Insider Threat Statistics 2026: Cost, Frequency & Detection

Insider incidents now cost the average organization $17.4 million per year, according to the Ponemon Institute's 2025 Cost of Insider Risks study sponsored by DTEX. The people who already have badges, passwords, and legitimate access cause more sustained financial damage than most external attack categories, and they take 81 days on average to contain. This page compiles 46 insider threat statistics from Ponemon/DTEX, Cybersecurity Insiders, Verizon DBIR, Securonix, and Gartner, covering cost, frequency, incident types, detection times, and the layoff-driven risk of departing employees.

Cost of Insider Incidents

The Ponemon Institute has tracked insider incident costs since 2016, and the line only moves in one direction. Insider events rarely make headlines the way external breaches do — our data breach statistics cover that side of the ledger — but the annualized cost per organization is higher than most breach categories.

1. Insider risks cost the average organization $17.4 million per year, up from $16.2 million in 2023 (Ponemon Institute 2025 Cost of Insider Risks, sponsored by DTEX).
2. That is a $1.2 million (7.4%) increase in two years, on top of earlier rises in the same Ponemon series.
3. Credential theft is the most expensive incident category at roughly $779,000 per incident (Ponemon/DTEX 2025).
4. Malicious or criminal insider incidents cost roughly $715,000 each to investigate, contain, and remediate (Ponemon 2023).
5. Negligence-driven incidents are the cheapest per event at roughly $505,000 — but they dominate total cost because they are by far the most frequent type (Ponemon 2023).
6. Business disruption and lost productivity consistently rank as the largest single cost activity in Ponemon's insider incident cost model, ahead of technology and direct remediation spend.
7. Combining Ponemon's $17.4 million annual figure with the Securonix average of 13.5 insider events per year puts the all-in cost per insider event near $1.3 million once overhead, disruption, and containment are allocated.
8. North American organizations carry the highest regional insider risk costs, at just over $19 million per year in Ponemon's 2022 cohort — well above the global average.
9. The long-run trend is steep: average annual cost has climbed from $11.45 million in 2020 to $17.4 million in 2025, a 52% increase in five years (Ponemon series).

Frequency & Trend

Insider incidents are not rare events that hit unlucky companies. Survey and telemetry data show they are routine — a monthly occurrence for the average organization. For the broader threat picture, see our cybersecurity statistics for 2026.

10. 83% of organizations reported at least one insider attack in the past year (Cybersecurity Insiders 2024 Insider Threat Report).
11. Read the other way: fewer than 1 in 5 organizations got through the year without a single insider attack (Cybersecurity Insiders 2024).
12. 48% of organizations say insider attacks became more frequent over the past 12 months (Cybersecurity Insiders 2024).
13. Organizations experience an average of 13.5 insider events per year — more than one per month (Securonix).
14. 76% of organizations report rising insider event frequency (Securonix).
15. 74% of organizations consider themselves at least moderately vulnerable to insider threats (Gurucul/Cybersecurity Insiders).
16. Internal actors appear in roughly one in three breaches, concentrated in the miscellaneous errors and privilege misuse patterns (Verizon Data Breach Investigations Report).
17. 68% of all breaches involved a non-malicious human element — errors, misdelivery, or falling for social engineering (Verizon DBIR 2024).

Incident Types Breakdown

Not all insiders are saboteurs. Ponemon's data splits insider incidents into three profiles, and the largest share is simple carelessness — misdirected email, misconfigured shares, mishandled data. The smallest share, stolen credentials, is the most expensive.

18. Negligence and mistakes account for roughly 55% of insider incidents (Ponemon/DTEX 2025).
19. Malicious insiders — employees or contractors acting deliberately — account for roughly 25% of incidents (Ponemon/DTEX 2025).
20. Credential theft, where an outsider hijacks an insider's identity, accounts for roughly 20% of incidents (Ponemon/DTEX 2025).
21. The cost curve runs opposite to the frequency curve: the rarest type, credential theft, costs about 54% more per incident than the most common type, negligence (~$779,000 vs ~$505,000, Ponemon).
22. Credential theft's share of insider incidents has grown from roughly 14% in 2020 to 20% in 2025 across Ponemon cohorts — stolen identities are the fastest-growing insider vector. Our password statistics show why credentials remain the softest target.
23. Misdelivery — sending data to the wrong recipient — is the single most common error action in breach data (Verizon DBIR). The email security statistics page covers how much of that risk lives in the inbox.
24. Financial gain is the leading motive in privilege misuse breaches, ahead of grudges and espionage (Verizon DBIR).
25. End users and system administrators are the two most common internal actor roles in breach data — the people with the broadest access, not specialist attackers (Verizon DBIR).

Detection & Containment Times

Insiders do not need to break in, so there is no perimeter alarm to trip. Detection depends on noticing abnormal behavior from accounts that are supposed to be there — which is why containment is measured in months, not hours, and why continuous 24/7 SOC monitoring is the control that moves this number.

26. The average insider incident takes 81 days to contain (Ponemon/DTEX 2025).
27. That is an improvement: containment averaged 86 days in the 2023 study — the first sustained drop in the series (Ponemon/DTEX).
28. Incidents contained within 31 days sit in the lowest-cost cohort in every Ponemon study since 2020.
29. Incidents that take more than 90 days to contain produce the highest annualized costs of any cohort in the study (Ponemon/DTEX).
30. Multiply the averages and the math is uncomfortable: 13.5 events per year at 81 days each is roughly 1,090 incident-days annually — the average organization always has at least one insider incident open (derived from Securonix and Ponemon/DTEX figures).
31. At $17.4 million spread across those incident-days, an open insider incident costs the average organization roughly $16,000 per day (derived from Ponemon/DTEX and Securonix figures).

Industry Breakdown

Insider risk concentrates where access to money and regulated data concentrates. Financial services pays the most per year; healthcare has historically been the one sector where insiders caused more breaches than outsiders.

32. Financial services carries the highest annual insider risk cost of any sector, at roughly $21 million per organization (Ponemon 2022).
33. Healthcare was the only industry where internal actors caused the majority of breaches — 56% — in Verizon's 2018 DBIR, and it remains among the most insider-exposed sectors in later editions.
34. Cost scales with headcount: the largest employers in Ponemon's cohort face annual insider risk costs more than double those of the smallest organizations studied.

Layoffs & Departing-Employee Risk

The single most predictable insider risk event is an employee leaving. Departing staff take data at scale, and layoff waves multiply the number of departures happening at once — with less goodwill attached. The 2026 tech layoffs tracker shows how many of those departures the industry is generating right now.

35. The majority of departing employees take company data with them when they leave, according to DTEX i3 insider risk investigations — most commonly customer lists, price books, and work product.
36. Exfiltration by departing employees typically clusters in their final two weeks of employment, after the decision to leave and before access is revoked (DTEX i3 investigations).
37. Around 60% of insider data exfiltration incidents involve flight-risk employees — staff already showing signals of imminent departure (Securonix Insider Threat Report).
38. Combining the averages: at 13.5 insider events per year with a 25% malicious share, the typical organization faces 3 to 4 deliberate insider events annually at roughly $715,000 each (derived from Securonix and Ponemon figures).

The Remote Work Factor

The remote shift moved corporate data onto home networks and personal devices, and the Ponemon series captured the effect directly: frequency, cost, and containment time all deteriorated between the 2020 and 2022 studies.

A widely circulated claim that insider incidents rose 58% after the shift to remote work traces back to vendor surveys with self-selected samples. The Ponemon cohort data below covers the same period with a consistent methodology, and it is the more defensible series.

39. Insider incident frequency rose 44% between the 2020 and 2022 Ponemon studies — the two years spanning the remote shift.
40. Average annual cost jumped from $11.45 million (2020) to $15.38 million (2022), a 34% increase in two years (Ponemon).
41. Containment time stretched from 77 days in 2020 to 85 days in 2022 as security teams lost line-of-sight to devices and data outside the office (Ponemon).

Monitoring & Prevention

The data points at a clear economic argument. Containment time is the main cost driver, containment time is a function of detection, and detection of insiders requires around-the-clock behavioral monitoring — UEBA, DLP, and identity analytics watched by humans. Covering a single monitoring seat 24/7 takes at least five full-time analysts once shifts, weekends, and leave are accounted for, which is why most mid-size organizations and MSPs buy the capability through white label SOC services rather than building it. The same economics apply on the availability side, where outsourced NOC services cover infrastructure monitoring without a second in-house shift rotation.

42. Gartner projected that 50% of large enterprises would run formal insider risk programs by 2025, up from 10% in 2023 (Gartner).
43. That is a fivefold increase in formal program adoption in two years — the fastest maturation Gartner has projected for any insider-risk control category.
44. Organizations spend an average of 8.2% of their IT security budget on insider risk, a share Ponemon projects will roughly double to 16.5% (Ponemon 2023).
45. The share of breaches involving a human element fell from 74% in the 2023 DBIR to 68% in the 2024 DBIR — slow progress, but progress, as controls and training take hold (Verizon).
46. The five-day containment improvement between the 2023 and 2025 Ponemon studies — 86 days down to 81 — coincided with broader adoption of behavioral monitoring and dedicated insider risk tooling (Ponemon/DTEX).

One more piece of arithmetic worth sitting with: a single prevented credential theft incident, at roughly $779,000, covers more than a year of managed detection for most mid-size environments. The insider threat statistics above are an argument for watching the accounts you already trust — because the average organization has an insider incident open right now.

Sources

These statistics are compiled from the following research publications and databases:

• Ponemon Institute — Cost of Insider Risks Global Report 2025 (sponsored by DTEX Systems)
• Ponemon Institute — Cost of Insider Threats Global Reports 2020, 2022, and 2023
• DTEX Systems i3 Insider Risk Investigations Reports
• Cybersecurity Insiders — 2024 Insider Threat Report
• Gurucul / Cybersecurity Insiders — Insider Threat Report series
• Securonix — Insider Threat Report
• Verizon — Data Breach Investigations Report (DBIR) 2018, 2023, and 2024 editions
• Gartner — Insider Risk Management press releases and predictions

Statistics are updated as new data becomes available. Last updated: July 2026.