STIR/SHAKEN statistics from June 2026

June 2026 STIR/SHAKEN and robocall statistics are now available. The data show the latest trends in robocalls, STIR/SHAKEN participation, and attestation level usage. Let's have a look.

Signed robocalls by attestation level

Robocalls mostly level across attestation levels

Figure 1. Signed Robocalls by Attestation Last 6 Months

Figure 1 shows signed robocalls by attestation level over the past six months. Overall, the statistics were even with May across all attestation levels. Robocalls among all calls were 3.5%. Robocalls signed with A-level attestation were 1.9%. Robocalls among calls signed with B attestation were 6.4%, up slightly from May. Robocalls among calls signed with C attestation were 8.4%.

STIR/SHAKEN participation and coverage

We measure STIR/SHAKEN participation changes in two ways:

1. The number of Originating Service Providers (OSPs) signing calls received by our customers,
2. Service providers authorized to do SHAKEN by the STI Policy Administrator (STI-PA).

The number of SHAKEN signers was up

Figure 2. Monthly Number of OSPs Sending Signed Calls

Figure 2 shows that the number of Originating Service Providers (OSPs) observed signing calls in June was up 2.2% from the previous month.

The number of SHAKEN-authorized providers increased

Figure 3. STIR/SHAKEN Authorized Providers by Month

Figure 3 shows that the number of SHAKEN-authorized providers in June was up 1.9% from the previous month.

STIR/SHAKEN coverage

Signed calls at termination increased

Figure 4. The Percentage of Signed Calls at Termination Last 6 Months

Figure 4 shows the percentage of signed calls at termination for the past six months. This was up 3.3% in June, to 48.8%. This is a welcome improvement. We haven't seen these levels in 20 months. It is still far from the level needed to deliver the full benefits of call authentication.

Calls signed with A-level attestation increased

Figure 5. Percentage of Calls with SHAKEN Attestation Levels Last 6 Months

Figure 5 shows the percentage of calls signed by attestation level. The percentage of calls signed with full A-level attestation was 30.8% in June, up 1.1% from May. This accounted for most of the increase in signed calls noted above. The percentage of calls signed with B-level attestation was 4.4%, up 0.9% from May. The percentage of calls signed with C-level attestation was 7.8%, up 0.7% from May.

Patterns among prolific robocall signers

Here are robocall and attestation statistics for the top 10 SHAKEN-authorized providers ranked by the percentages of signed calls identified as robocalls.

Robocalls from prolific robocall signers increased

Figure 6. Robocall Percentage by Attestation—Prolific Robocall Signers by Robocall %

Figure 6 shows robocalls authenticated by the top 10 robocall signers ranked by robocall percentage over the past six months.

In June, the robocall percentage among prolific robocall signers was up from May. The robocall percentage with A-level attestation was up 2.1%. The robocall percentage with B-level attestation was up 11.3%. The percentage of robocalls with C-level attestation was down 6.2%.

Prolific robocall signers authenticate most calls with A-level attestation

Figure 7. Call Percentage by Attestation—Prolific Robocall Signers

Figure 7 shows the percentages of calls signed by the top 10 robocall signers by authentication level. In June, 97.4% of the calls authenticated by the top ten prolific robocall signers had an A-level attestation. Almost none had a B-level attestation. 1.3% had a C-level attestation.

Recap

• Robocall percentages were mostly level with May.
• STIR/SHAKEN participation improved, with 2.2% more SHAKEN signers and 1.9% more authorized providers.
• STIR/SHAKEN coverage increased 3.3%, to 48.8%. This is a welcome improvement. We haven't seen these levels in 20 months. It is still far from the level needed to deliver the full benefits of call authentication.
• Robocalls authenticated by prolific robocall signers increased from May. They continue to sign almost all calls with A-level attestation.

TransNexus solutions

TransNexus is a leader in developing innovative software to manage and protect telecommunications networks worldwide. The company has over 25 years of experience in providing telecom software solutions including toll fraud prevention, robocall mitigation and prevention, CDR and call analytics, advanced call routing, billing support, STIR/SHAKEN, and branded calling.

Contact us today to learn more.