One Bank at the Edge: A Solitary Capital-Depletion Signature at 2025Q4

The screen returns exactly one match. Summit National Bank, Wyoming (FDIC CERT 25054), holds $74.4M in total assets and reports a CET1 ratio of 5.17% at 2025Q4 — well below the 8.0% Prompt Corrective Action threshold for adequately capitalized, and materially below the 6.5% CET1 floor for well-capitalized under 12 CFR § 324.403. The cohort is entirely under-$200M by asset band and entirely Wyoming by geography, both facts driven by the population of one.

A cohort of one is a supervisory artifact, not a sector movement. The value of surfacing it is not distributional — no distribution exists — but exceptional: this institution has cleared a screen designed to catch trajectory-plus-level in combination, and it has cleared it decisively. A CET1 ratio starting with a 5 is not proximity to PCA; it is inside PCA territory on the CET1 metric standing alone. The three-quarter declining trajectory that qualifies it for the cohort is layered on top of an already-critical absolute level. The read here is not 'a bank approaching a threshold' but 'a bank that has crossed multiple thresholds and continues to trend in the wrong direction.'

The relevant precedent set is small but the direct fits are informative on structural mechanism, not on scale. First Republic Bank (FDIC CERT 59017, failed May 2023) demonstrated multi-quarter CET1 deterioration alongside interest-rate-driven securities losses before failing on a deposit run; the capital trajectory functioned as a contemporaneous indicator of stress that ultimately resolved through liquidity, not solvency. Republic Bank, Pennsylvania (FDIC CERT 27332, failed April 2024) is the closer trajectory analog at community-bank asset scale — capital deteriorated across several quarters before failure, with CET1 declining toward and through the well-capitalized floor.

The First National Bank of Lindsay, Oklahoma (FDIC CERT 4134, failed October 2024) is a partial fit and should be cited with caution: pre-failure capital trajectory was deteriorating, but the failure timeline was compressed by fraud-driven loss recognition rather than the gradual erosion that this cohort's screen is designed to detect. It matches on scale — a sub-$200M community bank — but not on the trajectory-as-leading-indicator narrative.

Across the three precedents, the trajectory shape appears in advance of failure in two of three cases, and appears alongside a compressed fraud discovery in the third. The corpus supports treating multi-quarter CET1 decline at low absolute levels as a supervisorily meaningful signature.

The regulatory framework here is layered and unambiguous. Under 12 CFR § 324.403, a bank is well-capitalized at 6.5% CET1 and adequately capitalized at 4.5%; the FDIC's Prompt Corrective Action regime under 12 U.S.C. § 1831o imposes progressively more restrictive supervisory actions as capital categories deteriorate. A CET1 ratio of 5.17% sits between the adequately capitalized floor and the well-capitalized threshold, which places the institution in the undercapitalized band once the full PCA framework is applied across all capital ratios. The three-quarter declining trajectory that defines cohort membership implies that the direction of travel is toward further PCA classifications rather than recovery.

The mechanism matters more than the metric in isolation. A low CET1 ratio with a stable or rising trajectory suggests either recent recapitalization or a stress event now working through the balance sheet — supervisorily concerning but potentially transitional. A low CET1 ratio with a multi-quarter declining trajectory suggests ongoing loss absorption exceeding earnings retention, which is the pattern PCA was designed to intercept before it resolves in resolution. At a $74.4M asset base, the retained earnings capacity to reverse a declining CET1 trajectory is structurally limited: small-bank net interest margins, even at healthy levels, generate absolute capital increments measured in low single-digit millions per year. If the trajectory reflects credit losses or securities marks working through capital, the arithmetic of self-remediation is unfavorable within a short horizon.

The CAMELS Capital component is directly engaged here. The trajectory-plus-level combination is precisely the signature that supervisors read as a leading indicator rather than a point-in-time snapshot.

For Klaros, a cohort of one converts what would be a sector engagement into a targeted single-name posture. Three action arcs follow.

1. Situational monitoring, not sector framing. Summit National Bank (CERT 25054) should be tracked as a named watch item rather than folded into a broader capital-stress narrative. The 2025Q4 read is a data point; the 2026Q1 and 2026Q2 Call Reports will determine whether the trajectory has inflected, stabilized, or continued. Klaros is well-positioned to be the analytical shop that saw the trajectory shape early and characterized it precisely.

2. Adjacent-cohort scanning. A cohort of one at the strict threshold (CET1 < 9.0% with three-quarter decline) suggests running an expanded scan at looser thresholds — CET1 < 10.0% with two-quarter decline, for example — to identify the next tier of institutions where the trajectory shape is emerging but has not yet cleared the strict screen. This is where Klaros can offer clients early visibility into cohort formation rather than cohort maturity.

3. Advisory positioning for community-bank capital planning. The Summit National case illustrates a broader advisory theme for sub-$200M community banks: at that asset scale, capital trajectory reversals require either external capital, portfolio actions, or expense structure changes that are difficult to execute quickly. Klaros can develop this as a proactive advisory offering for community banks whose trajectories are earlier in the pattern than Summit's — the value proposition is intervention timing, not crisis management.