Filing Watch: Midwest / NW — March 2026
Insurance Xdate
FILING WATCH
Midwest / NW Edition · March 2026
Page 1 — Workers Comp & Commercial Auto
Monthly Rate Briefing

No clean rate headline this month — the commercial-auto story moved into the rating engine.

March produced no workers-comp or commercial-auto filing that cleared our rate-increase bar on severity, reach and approved status across the twelve-state quadrant. But fleets didn't get a pass: the action this cycle is structural — scoring models, telematics travel-tiers and 'black box' physical-damage algorithms. The whole story is on page 3.

Industries in this issue's filings

Trucking & Motor Carriers
the cycle's focus
Construction & Trades
rated across filings
Auto Dealers & Repair
reclassified

Lead Filing

See Page 3Structural

Why page 1 is a pointer this month, not a lead

Our page-1 screen looks for approved, unfavorable, high-severity rate increases of 1,000+ policyholders in workers comp and commercial auto. In March, across all twelve states, the qualifying commercial-auto moves were either severity-3 (below the floor without 25,000-policyholder reach) or were rate changes whose real substance is a new scoring algorithm — which is exactly what page 3 exists to cover.

The honest read: March is a structural month. Carriers spent it rebuilding how fleets are priced rather than pushing a flat percentage. Berkshire Hathaway Homestate and Canal both reset their Oregon commercial-auto math, and a wave of livestock and small-commercial liability re-rates landed across the Dakotas and the Mountain West. Turn to page 3 — that's where your renewal conversations start this cycle.

Also Approved This Cycle

Is a quiet rate month good news?

Not exactly. A flat headline rate paired with a new scoring model can move an individual client's premium more than a clean 10% hike would — and it's harder to spot on a renewal. When Berkshire Hathaway Homestate's Oregon filing carries a 256% maximum individual swing on an 18% average, the average is the least useful number on the page. Read the structure, not the headline.

Northeast
Southeast
Midwest / NWThis week
Southwest
Insurance Xdate
FILING WATCH
Midwest / NW Edition · March 2026
Page 2 — The Wider Market: All Other Lines
Beyond WC & Auto

Liability is repricing across the Dakotas and the Mountain West.

Same screen, every other commercial line: with the quadrant widened to all twelve states, March fills out where it used to be quiet. Six general-liability and farm filings qualify across Idaho, the Dakotas, Montana and Nebraska — and the real story in most of them is a structural change tucked behind a modest average rate.

Industries in this issue's filings

Construction & Trades
in 4 of 6 filings
Agriculture & Livestock
in 3 of 6 filings
Property Mgmt & Real Estate
in 3 of 6 filings
Retail & Food Service
in 3 of 6 filings

Lead Filing

IDGeneral LiabilitySeverity 4/5

Hiscox caps Idaho property managers at +50% — and penalizes early cancellation

Approved Mar 26, effective June 15. Hiscox raises Idaho small-commercial general liability about 7% on average across 1,991 policyholders, but property-management classes take a capped 50% increase against a 176.7% indicated need — the cap is the only thing holding them back. The structural move that touches everyone: a new 25% minimum earned premium that penalizes landscapers, janitorial, mobile-food and small contractors who cancel mid-term, plus a +/-25% schedule-rating plan.

Who feels it: Idaho property managers, landscapers, janitorial and mobile-food operators. Move now: warn clients on the new minimum earned premium before they bind — cancelling early now costs a quarter of the annual premium, and the property-management cap means another increase is likely next cycle.

+50%
Prop. mgmt cap
~7%
Average
1,991
Policyholders
25% MEP
Early-cancel

Three Filings Worth a Closer Look

NDGeneral LiabilitySev 3

SECURA reprices North Dakota GL on ISO loss costs — up to 52% on some risks

SECURA raises its 2,129-policy North Dakota general-liability book 6% on average, but individual risks reach 52% on revised ISO loss costs. Agricultural consultants, sports and recreation camps, and abusive-conduct classes are specifically targeted with higher base rates and minimums. The largest GL book in the quadrant this cycle.

2,129 policyholders · $4.55M premium · approved Mar 25
NEFarm & Ranch CMPSev 3

Nationwide Agribusiness raises Nebraska farm rates — livestock up to 21%

Nationwide Agribusiness raises its 2,226-policy Nebraska farm-and-ranch book 5.4% on average, with livestock-heavy operations reaching 21%. It introduces a Farm Flexible Deductible that aggregates property deductibles policy-wide and revises replacement-cost and wind/hail factors — a structural change that can quietly raise out-of-pocket exposure on a storm claim.

2,226 policyholders · $35.0M premium · effective Jun 1
SDGeneral LiabilitySev 4

Grinnell raises South Dakota confined-livestock GL base rates ~350%

Grinnell Mutual reprices its South Dakota GL on updated ISO loss costs, and confined-livestock care, custody and control base rates jump from the $180-$280 range to $800-$1,300 — roughly 350%. The filing also adds a mandatory punitive-damages exclusion, a litigation-funding disclosure endorsement, and narrower additional-insured forms limited to the named insured's own negligence.

1,061 policyholders · $1.64M premium · effective Oct 1

The Rest of the Qualifying List

StateCarrierLine / Sub-typeSeverityPolicyholdersEffective
MTHiscox Ins CoOther Liability — General Liability4 / 51,358Jun 15, 2026
NDGrinnell MutualCMP — Businessowners4 / 5797Apr 1, 2026
MOUnited Fire GroupBOP — Legacy form withdrawal4 / 5507Feb 4, 2026

Also on the radar

Two structural moves outrank their rate lines: Grinnell's North Dakota businessowners book (797 policyholders) debits buildings over 50 years old 20% and drops automatic-increase factors from 8% to 0% — page 3. And United Fire Group withdrew its legacy Missouri ArtisanPro and PremierPro BOP forms (507 policyholders), forcing a migration that can non-renew heavy-subcontracting contractors. A large neutral Missouri Employers Mutual workers-comp filing touching 13,336 policyholders (Mar 5) reshuffled experience tiers without an average rate change — the kind of quiet move that still shifts an individual comp renewal.

Insurance Xdate
FILING WATCH
Midwest / NW Edition · March 2026
Page 3 — Filing Effects: Guidelines, Coverage & Scoring
Beyond the Rate Number

This is March's real edition: commercial auto is being re-engineered, not just re-priced.

Same twelve states, the structural changes that define the month. Carriers rebuilt commercial-auto rating in Oregon with ISO Risk Analyzer symbols and GPS-based travel tiers, while liability writers across the Dakotas reset livestock base rates and bolted on punitive-damages and litigation-funding endorsements. The headline averages stay modest; the individual swings reach 256%.

Industries in this page's filings

Trucking & Fleets
in 4 of 11 filings
Agriculture & Livestock
in 4 of 11 filings
Construction & Trades
in 5 of 11 filings
Property Mgmt & Real Estate
in 3 of 11 filings

Lead Filing · Scoring Model — Market Signal

ORCommercial AutoSeverity 4/5

Berkshire Hathaway Homestate's ISO Risk Analyzer swings Oregon auto up to 256%

Approved Mar 5, effective Oct 1. Berkshire Hathaway Homestate adopted ISO Risk Analyzer commercial-auto vehicle symbols across its Oregon book, shifting bodily-injury/property-damage rates +26.5% while cutting physical damage 13.9%. The average increase is about 18% — but the new symbol-driven model produces individual swings as high as 256%, and the carrier's own expected liability rate need is 68%. When a scoring model can more-than-double one account while barely moving the next, the state average stops being a planning tool. Every carrier adopting the same ISO Risk Analyzer symbols inherits the same volatility.

+26.5%
Liability
-13.9%
Phys. damage
+256%
Max swing
68%
Indicated need

New Scoring Models — The Trend Is Real

ORCommercial Auto — TruckersSev 4

Canal prices Oregon truckers on the zip codes they actually drive through

Canal launched an optional hybrid mileage-plus-telematics program with Travel Tiers that rate by the GPS routes a vehicle takes, not just where it's garaged — and it requires active ELD data sharing. Overall +13.1%, max +37%, against a 33.5% indicated need. Your fleet's premium now follows its dispatch map.

116 policyholders · $5.1M premium · approved Mar 12
ORCommercial AutoSev 4

Berkshire Hathaway shifts risk from physical damage to liability

The ISO Risk Analyzer adoption (lead, above) doesn't just rescore — it re-weights the policy, raising liability 26.5% while cutting physical damage 13.9%. Accounts carrying high liability limits absorb the move; the physical-damage 'discount' rarely offsets it. Read the new vehicle symbols on each renewal, not just the average.

439 policyholders · $7.0M premium · approved Mar 5

Coverage Contraction

SDGeneral LiabilitySev 4

Grinnell adds punitive-damages and litigation-funding endorsements in South Dakota

Behind the ~350% confined-livestock base-rate jump (page 2), Grinnell adds a mandatory punitive-damages exclusion, a litigation-funding mutual-disclosure endorsement that lets the carrier demand details on third-party claim funding, and narrower additional-insured forms covering only the named insured's own negligence. Livestock and ag care-and-custody accounts lose ground on both price and coverage.

1,061 policyholders · $1.64M premium · approved Mar 31
IDGeneral LiabilitySev 4

Hiscox's 25% minimum earned premium reshapes Idaho cancellation

The Idaho GL filing (page 2) is a guideline change as much as a rate move: a new 25% minimum earned premium penalizes landscapers, janitorial, mobile-food and small contractors who cancel mid-term, and a +/-25% schedule-rating plan hands underwriters wide discretion. The same change lands in Montana on the same June 15 date.

1,991 policyholders · $1.41M premium · approved Mar 26
NDBusinessownersSev 4

Grinnell debits older North Dakota buildings 20% and zeroes inflation guard

Grinnell's North Dakota businessowners reset puts a 20% debit on buildings over 50 years old, drops the automatic-increase (inflation-guard) factor from 8% to 0%, and sets flat $1,000 minimum premiums for apartments and houses of worship. Owners of older buildings carry the age debit, and the zeroed inflation guard quietly erodes replacement-cost adequacy over time.

797 policyholders · $3.0M premium · effective Apr 1

Underwriting & Guideline Changes

MOBusinessownersSev 4

United Fire Group forces a legacy-BOP migration in Missouri

United Fire Group withdrew its ArtisanPro and PremierPro businessowners manuals, migrating roughly 507 Missouri policyholders into a new BOP-Pro product. Eligibility tightens: contractors subcontracting over 25% of work or running over $500,000 payroll face non-renewal. A market exit dressed as a product refresh — confirm which clients are mapped to the legacy forms now.

507 policyholders · approved Mar 18 · effective Feb 4
MTGeneral LiabilitySev 4

Hiscox brings the same early-cancellation penalty to Montana

Hiscox's Montana GL filing mirrors Idaho: property management +50%, retail/food service and plumbing +20%, and the same 25% minimum earned premium on insured-initiated cancellation for landscapers, janitorial, mobile-food and small contractors. One carrier resetting two Mountain-West states on the same effective date is a pattern worth flagging to clients.

1,358 policyholders · $1.0M premium · approved Mar 11

Also on the radar

March confirms two parallel waves across the widened quadrant: ISO Risk Analyzer and GPS travel-tiers reprice Oregon commercial auto while livestock and small-commercial liability re-rates land across the Dakotas, Idaho and Montana — most carrying a structural change behind a modest average. A favorable counterpoint: a good-sentiment Oregon commercial-auto scoring filing (408 policyholders, approved Mar 12) rewards clean fleets on the same ISO machinery. And keep watching United Fire Group's Missouri BOP exit — legacy-form withdrawals tend to arrive in clusters.