Treasury teams at investment banking firms managing FCM-affiliate customer-segregated investment portfolios under Regulation 1.25 are increasingly using frontier AI assistants to draft post-amendment investment policy statements for FCM-affiliate books, validate counterparty-eligibility against the 50 per cent ceiling, produce DWAM-compliant portfolio construction playbooks, and to surface practical readings of the 2024 amendment package issued by the Commodity Futures Trading Commission (CFTC) on permissible investments of customer segregated funds under Regulation 1.25.
The amendments restate the 50 per cent concentration ceiling for government money market funds and qualified Treasury ETFs, the 24-month portfolio dollar-weighted average maturity (DWAM) standard and its carve-out set, and the separate March 31, 2025 compliance anchor for the Segregation Investment Detail Report (SIDR) and customer risk disclosure statement updates. Across this question set the model outputs that treasury teams at investment banks would carry into a investment policy statements departed from the regulator's verbatim text on each of the three operative axes.
Two frontier AI models tested by the RegLeg Brief (RLB) Specialist Panel reproduced the same failure shape across the audited question set on the CFTC's 2024 amendments to Regulation 1.25 (permissible investments of customer segregated funds by futures commission merchants and derivatives clearing organizations). The Panel calls the pattern Threshold-Trigger Elision and Carve-Out Inversion. The frontier AI models dropped the asset-size and management-company-size triggers that activate the 50 per cent concentration ceiling, swapped U.S. Treasury repurchase agreements into the DWAM exclusion set in place of the regulator's actual three carved-out classes, returned a no-DWAM-standard answer for direct U.S.
Treasury obligations where the 24-month portfolio standard governs by default, and drifted from the March 31, 2025 SIDR compliance anchor into a generic "roughly six months to a year after the effective date" formulation. The Panel records the failure class as inference_drift across the five audited findings, each bound to verbatim regulator-issued primary substrate held by the Panel.
For treasury teams at investment banks the operational consequence is direct. An investment policy statement framed around a uniform 50 per cent ceiling would mis-allow concentration exposure against funds and management companies the regulator's two-trigger structure excludes. A DWAM portfolio playbook that carves out U.S. Treasury repos would over-allocate to a book inside the 24-month standard. A SIDR submission timeline anchored to a relative range would miss the regulator's March 31, 2025 date.
The failure surfaces in workflows the audience already uses AI for, the model output reads as a fluent reconstruction of the amended rule, and validation only happens if the reader independently knew the dual-trigger structure of the 50 per cent ceiling, the three-class DWAM carve-out, and the March 31, 2025 SIDR anchor. None of these are properties the audience can recover at runtime from the AI output alone.
The five findings are published with immutable RLB Citation IDs and bound to verbatim Commodity Futures Trading Commission source text: RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q001-Opus47, RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q001-Sonnet46, RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q002-Opus47, RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q002-Sonnet46, RLB-H-US-CFTC-FCM-DCO-CUSTOMER-FUNDS-INVESTMENTS-REG-1-25-2024-Q004-Opus47. The full audit on Regulation 1.25 is on the Regulation 1.25 (2024 amendments) hub on RegLegBrief.com.
This is the consolidated view of findings. Click the Citation IDs or 'see details →' on any item for the full details for each finding.
For Treasury teams at Investment Banking firms working on FCM and DCO customer-funds investment policy, segregation testing, and SIDR scheduling work in the United States, the dropped size-trigger axis is the most consequential element of this finding. Claude Opus 4.7 stated that the 50 per cent ceiling applies uniformly regardless of size, when the rule actually engages the ceiling only against funds whose own assets exceed one billion dollars and whose management company manages at least twenty-five billion dollars.
A treasury teams at investment banking firms who frames the concentration framework around the model output would misclassify smaller funds and name-brand managers under the wrong regime, mismatching either the policy ceiling or the testing thresholds. The failure is operationally silent in review because the answer reads as adjudicating the size question rather than dropping the two triggers that govern it.
For Treasury teams at Investment Banking firms working on FCM and DCO customer-funds investment policy, segregation testing, and SIDR scheduling work in the United States, the dropped size-trigger axis is the most consequential element of this finding. Claude Sonnet 4.6 stated that the 50 per cent ceiling applies uniformly regardless of size, when the rule actually engages the ceiling only against funds whose own assets exceed one billion dollars and whose management company manages at least twenty-five billion dollars.
A treasury teams at investment banking firms who frames the concentration framework around the model output would misclassify smaller funds and name-brand managers under the wrong regime, mismatching either the policy ceiling or the testing thresholds. The failure is operationally silent in review because the answer reads as adjudicating the size question rather than dropping the two triggers that govern it.
For Treasury teams at Investment Banking firms working on FCM and DCO customer-funds investment policy, segregation testing, and SIDR scheduling work in the United States, the inverted DWAM carve-out misdirects portfolio testing toward an asset class the rule does not exclude (U.S. Treasury repos) while omitting the asset classes the rule does exclude (government money market funds, Treasury ETFs, and foreign sovereign debt). A treasury teams at investment banking firms who applies the model output to denominator construction or compliance testing would simultaneously over-include carved-out classes and under-include included ones.
The error surface is exactly where verification is least likely: the headline 24-month number is correct, so the carve-out clause passes a quick numeric check. Independent verification against 17 CFR 1.25(b)(3)(iv) is the only reliable safeguard.
For Treasury teams at Investment Banking firms working on FCM and DCO customer-funds investment policy, segregation testing, and SIDR scheduling work in the United States, Claude Sonnet 4.6's no-standard answer is the most dangerous failure mode in this regulation. The model concluded that no DWAM standard applies to direct U.S. Treasury obligations, when in fact the 24-month portfolio limit governs them by default; only government MMFs, Treasury ETFs, and foreign sovereign debt are carved out.
A treasury teams at investment banking firms who treats the model's response as authoritative would skip DWAM testing on the largest part of an FCM's segregated portfolio, defaulting to a no-compliance-work-required posture where compliance work is required. This is the failure shape that survives review most cleanly because the model framed the answer as substantive resolution rather than uncertainty.
For Treasury teams at Investment Banking firms working on FCM and DCO customer-funds investment policy, segregation testing, and SIDR scheduling work in the United States, the drift from a date certain (March 31, 2025) to a relative range produced a compliance calendar that misses the published deadline by months. Claude Opus 4.7 framed the SIDR and customer risk disclosure update window as roughly six months to a year after the effective date, where the regulator's published anchor is the specific March 31, 2025 date.
A treasury teams at investment banking firms who built the SIDR scheduling workflow against the model output would either miss the deadline outright or schedule the work for a window with no regulatory standing. The error pattern is operationally specific: the model retrieved the structural distinction between general effective date and SIDR-specific compliance date, then drifted on the actual anchor.
Every finding on this page compares an AI subject's account of the rule against the regulator's verbatim text from the regulator's own portal. Both are linked. Each delta, its root causes, and impact analysis are documented and published with immutable Citation IDs.