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MS & SONS CORP
Humboldt, IA
CarrierChk vetting signal
No flags raised
Authority, insurance, safety rating, crash records and out-of-service rates checked
FMCSA status: Active & Authorized · DOT 133751 · MC 143871
Satisfactory
Active 41 yrs, 4 mo
Broker Vetting Summary
Key signals from current FMCSA records
Authority
Active
MC-143871 · Common carrier
Insurance
On File
Starstone Specialty Insurance Company
Safety
Satisfactory
9.4% OOS · 57 inspections on record
✓ No risk flags found on authority or insurance records
Vetting notes
- Operating authority active for 41 yrs, 4 mo
- Insurance on file: $2,000,000
- FMCSA safety rating: Satisfactory
- Vehicle out-of-service rate 16.7% — below the 20.7% national average
- Driver out-of-service rate 0.0% — below the 5.5% national average
- 57 FMCSA inspections on record
Authority & Compliance
Authority, insurance and required filings
Operating Authority
MC143871
Motor Carrier of Property (Except Household Goods) · $1,000,000 required
Insurance on File
Starstone Specialty Insurance Company
BI&PD · $2,000,000 · Policy AXS00516622P-04
Great West Casualty Co
BI&PD · $1,000,000 · Policy MCP74021A
Crum & Forster Specialty Insurance Company
BI&PD · $2,000,000 · Policy SEO-109833
Required Filings
Liability (BIPD)
$5,000,000
Company Information
Registration, contact and cargo details
FMCSA Registration
DOT Number
133751
MC Number
MC-143871
Safety Rating
Satisfactory
Entity Type
Corporation
Operation Classification
Authorized for hire
MCS-150 Filed
April 3, 2026
FMCSA Registration
June 1, 1974
Authority Granted
July 8, 1985
Annual Mileage
2,427,838 mi (2024)
Contact Information
Address
1605 Sassy Lane, Humboldt, IA 50548
Phone
Email
Website
Owner / Officer
Teri Dunphy
Cargo Types
General FreightLiquids/GasesGrain/FeedDry BulkPaper ProductsFarm SuppliesOther Cargo
Safety Snapshot
Out-of-service rates, violations and crashes
Safety & Inspection Summary
Total Inspections
57
Driver Inspections
44
Vehicle Inspections
22
Out-of-Service Violations
3
Violations by Category
Vehicle Maintenance30
Unsafe Driving25
Hours of Service6
OOS Rates vs. National Average
Driver OOS Rate0.0% · national avg 5.5%
✓ Below national average
Vehicle OOS Rate16.7% · national avg 20.7%
✓ Below national average
9.4% of 32 inspections in the last 24 months put a driver or vehicle out of service —
25th percentile among carriers with 25–99 inspections (lower is better).
CarrierChk calculation from FMCSA roadside inspection records, not an FMCSA score.
Inspection Trend by Year
2026
2025
2024
Violation Rate by Category
Share of roadside inspections in FMCSA's rolling 24-month window that found a violation in each category. The individual violations are listed under each inspection in Inspection Details below. None of this is the basis of the safety rating, which comes from an on-site compliance review.
Vehicle Maintenance
8 of 12 inspections
Unsafe Driving
14 of 34 inspections
Hours of Service
1 of 34 inspections
Driver Fitness
1 of 34 inspections
Controlled Substances
0 of 34 inspections
Crash History (2)
Crashes reported to FMCSA in the last 24 months. A crash appearing here is a reported event, not a finding of fault.
2
Crashes
0
Fatalities
0
Injuries
2
Tow-aways
| Date | State | Fatal | Injured | Tow | Conditions |
|---|---|---|---|---|---|
| January 3, 2026 | WI | — | — | Yes | Snow · Daylight · Snow |
| September 26, 2025 | IA | — | — | Yes | No Adverse Conditions · Daylight · Dry |
Fleet & Operating Areas
Observed roadside activity and equipment
Where This Carrier Operates
States where this carrier's roadside inspections were recorded
FewerMore
IA33
SD4
IL2
MN2
WI2
KS1
and 1 more state
Fleet & Equipment (61)
Vehicles identified in this carrier's inspection history. Year, make, model and equipment type are decoded from the VIN.
Power units
~27
of 40 reported to FMCSA
Trailers
~34
seen at inspection
Equipment types observed
Tractor
26
Tank
22
Semi-trailer
6
Dry Van
3
Grain / Hopper
2
Flatbed
1
Not Applicable
1
Units on record
| Vehicle | Type | VIN | Inspections | With OOS |
|---|---|---|---|---|
| Ptrb | Tractor | 1NPXGGGG00D248885 | 4 | — |
| 2002 Peterbilt 379 | Tractor · Class 8 | 1XP5DB9X22N574187 | 4 | 1 |
| 2018 Peterbilt 389 | Tractor · Class 8 | 1XPXD49X8JD462597 | 3 | — |
| 2000 International 9200i | Tractor · Class 8 | 2HSCEAMR7YC068563 | 3 | — |
| Walker | Semi-trailer | 5WSAE4229AN041737 | 3 | — |
| Ptrb | Tractor | 0V2100005168863NE | 2 | — |
| 1994 Brenner Tank | Tank | 10BABB232RF411458 | 2 | — |
| Peterbilt | Tractor | 1NPXGGGG00D248806 | 2 | — |
| Ptrb | Tractor | 1NPXGGGG80D390031 | 2 | — |
| 2021 Polar Tank Trailer | Tank · 43 ft | 1PMKR4329M1112844 | 2 | — |
Show all 61 units
| Vehicle | Type | VIN | Inspections | With OOS |
|---|---|---|---|---|
| Polar Mfg. | Semi-trailer | 1PMS14221J1049825 | 2 | — |
| 2014 Polar Tank Trailer | Tank · 42 ft | 1PMS14222E1042582 | 2 | — |
| 2009 Polar Tank Trailer | Tank · 43 ft | 1PMS1432X91035593 | 2 | — |
| 2016 Timpte, Inc Timpte | Grain / Hopper · 42 ft | 1TDH42223GB152449 | 2 | — |
| 2011 Utility Trailer Manufacturer | Dry Van · 53 ft | 1UYVS2531BG143212 | 2 | — |
| 2014 Westmor Industries | Tank · 40 ft | 1W9PH4021EM350546 | 2 | — |
| 2019 Kenworth W9 Series | Tractor · Class 8 | 1XKWD49X4KJ250462 | 2 | — |
| 2020 Kenworth T880 | Tractor · Class 8 | 1XKZDP9X7LJ409586 | 2 | — |
| 2000 Peterbilt 379 | Tractor · Class 8 | 1XP5DB9X4YN523993 | 2 | — |
| 2003 Peterbilt 379 | Tractor · Class 8 | 1XP5DB9X63N805545 | 2 | 1 |
| 2015 Peterbilt 389 | Tractor · Class 8 | 1XPXDP9X6FD283063 | 2 | — |
| 1992 Brenner Tank | Tank | 10BABB231NF347293 | 1 | — |
| 2017 Stoughton Trailers | Dry Van · 53 ft | 1DW1A5327HS715301 | 1 | 1 |
| 2020 East Manufacturing Corp. East Manufacturing Corp | Flatbed · Class 8 | 1E1H5Z288LR068058 | 1 | — |
| 2019 Peterbilt 389 | Tractor · Class 8 | 1NPXD49X6KD273796 | 1 | — |
| Ptrb | Tractor | 1NPXGGGG30D267415 | 1 | — |
| 2021 Polar Tank Trailer | Tank · 43 ft | 1PMKR4325M1112842 | 1 | — |
| 2021 Polar Tank Trailer | Tank · 43 ft | 1PMKR4326M1109478 | 1 | — |
| 2021 Polar Tank Trailer | Tank · 45 ft | 1PMKW4528M6106008 | 1 | — |
| 2000 Polar Tank Trailer | Tank · 42 ft | 1PMS14221Y1023350 | 1 | — |
| 1999 Polar Tank Trailer | Tank · 42 ft | 1PMS14222X1022285 | 1 | — |
| 1992 Polar Tank Trailer | Tank · 42 ft | 1PMS14223N1011664 | 1 | 1 |
| 2010 Polar Tank Trailer | Tank · 42 ft | 1PMS1422XA1036202 | 1 | 1 |
| 2012 Polar Tank Trailer | Tank · 42 ft | 1PMS1422XC1039054 | 1 | — |
| 2013 Polar Tank Trailer | Tank · 43 ft | 1PMS14329D1042009 | 1 | — |
| Ravens-met | Semi-trailer | 1R1F25026SJ095212 | 1 | — |
| 2014 Utility Trailer Manufacturer | Dry Van · 53 ft | 1UYVS2535EP916221 | 1 | — |
| 2014 Westmor Industries | Tank · 40 ft | 1W9PH4022EM350507 | 1 | — |
| 2021 Westmor Industries | Tank · 40 ft | 1W9PH4024MM350233 | 1 | — |
| 2013 Westmor Industries | Tank · 40 ft | 1W9PH4026DM350329 | 1 | — |
| 2015 Westmor Industries | Tank · 40 ft | 1W9PH4028FM350061 | 1 | — |
| 2016 Westmor Industries | Tank · 45 ft | 1W9PH4528GM350054 | 1 | — |
| 2003 Kenworth W900 | Tractor · Class 8 | 1XKWD49X23J386798 | 1 | — |
| 2007 Peterbilt 379 | Tractor · Class 8 | 1XP5D49X97D696330 | 1 | — |
| 1996 Peterbilt 379 | Tractor · Class 8 | 1XP5DB8X9TD390292 | 1 | — |
| 1995 Peterbilt 379 | Tractor · Class 8 | 1XP5DB9X1SD361835 | 1 | — |
| 2007 Peterbilt 379 | Tractor · Class 8 | 1XP5DB9X27D741564 | 1 | 1 |
| 2000 Peterbilt 379 | Tractor · Class 8 | 1XP5DB9X2YD487419 | 1 | 1 |
| 2004 Peterbilt 379 | Tractor · Class 8 | 1XP5DB9X34D835576 | 1 | — |
| 2004 Peterbilt 379 | Tractor · Class 8 | 1XP5DB9X54D812011 | 1 | — |
| 2006 Peterbilt 379 | Not Applicable · Class 8 | 1XP5DB9X96N644869 | 1 | — |
| 2023 Peterbilt 389 | Tractor · Class 8 | 1XPXD49X3PD880476 | 1 | — |
| 2008 Peterbilt 389 | Tractor · Class 8 | 1XPXDB9X18D751691 | 1 | — |
| 2025 Iowa Steel Fabricators, Llc | Tank · 44 ft | 1Z9FT4422S9593200 | 1 | — |
| 1990 International F-9370 | Tractor · Class 8 | 2HSFBX6R8LC034453 | 1 | — |
| Freightlin | Tractor | 3ALXFB008LDMP2200 | 1 | — |
| Hmde | Semi-trailer | 413148 | 1 | — |
| Jetc | Semi-trailer | 5JNGE5030RH002304 | 1 | 1 |
| Unknown | Semi-trailer | 5MC444621BK011490 | 1 | — |
| 2026 Wabash Tanks NON-DOT/TC Spec | Tank | 5WSABB239TN653235 | 1 | — |
| 2024 Dorsey | Grain / Hopper · 53 ft | 7KYCW5328RED40420 | 1 | — |
A vehicle appearing here was recorded in an inspection — it is not proof the carrier still operates it today.
Inspection Details
Each roadside inspection with its violations
Inspection Records (57)
| Date | Report # | Location | Level | Viol | OOS | Shipper | Unit Type | Make | VIN | License |
|---|---|---|---|---|---|---|---|---|---|---|
| September 29, 2026 | 0395000935 | CLARKS GROVE MN | I | 3 | — | CARRIER | Truck Tractor Semi-trailer |
PETERBILT POLAR MFG. |
1XP5DR9X3YN534296 1PMS14224C1039700 |
IA VF2716 IA FY5641 |
| 393.47E | Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt | Brakes Out of Adjustment | ||||||||
| 393.53B-B | Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear | Brakes All Others | ||||||||
| 393.45B2-B-AIR | Air Brake - Hose/tubing damaged or not secured | Brakes All Others | ||||||||
| August 18, 2026 | 0699000086 | CLARKS GROVE MN | I | 3 | — | FLINT HILLS RESOURCES | Truck Tractor Semi-trailer |
PETERBILT POLAR MFG. |
1XP5DB9X96N644869 1PMS14221J1049825 |
IA VF2717 IA FV6561 |
| 393.47E | Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt | Brakes Out of Adjustment | ||||||||
| 393.47A-LJN | Brakes - Loose/Missing Jam Nut | Brakes All Others | ||||||||
| 393.53B-B | Air Brake - CMV manufactured on or after 10/20/1994 has an automatic airbrake adjustment system that fails to compensate for wear | Brakes All Others | ||||||||
| August 12, 2026 | 371S000039 | IA, IA | III | 3 | — | BORREGAARD | Truck Tractor Semi-trailer |
PETERBILT POLAR TANK TRAILER |
1XP5DB9X22N574187 1PMS1432X91035593 |
IA VF4068 IA FB4723 |
| 392.2-SLLEWA1 | State/Local Laws - Excessive weight - 1-2500 lbs over on an axle/axle groups | |||||||||
| 392.2-SLLEWA1 | State/Local Laws - Excessive weight - 1-2500 lbs over on an axle/axle groups | |||||||||
| 392.2-SLLEWG1 | State/Local Laws - Excessive weight - 1-2500 lbs over on allowable gross weight | |||||||||
| July 21, 2026 | 508R000109 | IA, IA | II | 2 | — | M S AND SONS CORP | Truck Tractor Semi-trailer |
PETERBILT LUBBOCK |
1XP5DB9X1SD361835 57922 |
IA MX4062 IA FA5292 |
| 392.2-SLLS2 | State/Local Laws - Speeding 6-10 miles per hour over the speed limit | Speeding 2 | ||||||||
| 393.60D | Windshield / Windows - Tinting permits less than 70% of light transmittance | Windshield/ Glass/ Markings | ||||||||
| July 14, 2026 | 337C000151 | DES MOINES IA | III | — | — | MS AND SONS CORP | Truck Tractor Semi-trailer |
PETERBILT UTILITY TRAILER MANUFACTURER |
1XP5DB9X54D812011 1UYVS2531BG143212 |
IA VF5864 IA FY4772 |
| April 23, 2026 | 2448001586 | SPARTA WI | III | 1 | — | RAMROD INDUSTRIES | Truck Tractor Semi-trailer |
PETERBILT RAVENS-MET |
1NPXGGGG00D248806 1R1F25026SJ095212 |
IA VA8165 IA FW1791 |
| 392.2-SLLEWA1 | State/Local Laws - Excessive weight - 1-2500 lbs over on an axle/axle groups | |||||||||
| April 21, 2026 | 000P14KF69 | 39 - I35 SB MM 212 NORTHWOOD, IA | II | — | — | NONE | Truck Tractor Semi-trailer |
KENWORTH WESTMOR INDUSTRIES |
1XKWD49X4KJ250462 1W9PH4021EM350546 |
IA VF3012 IA LR3265 |
| March 27, 2026 | 5740001094 | WALL SD | III | — | — | FBN | Truck Tractor Semi-trailer |
KENWORTH UNKNOWN |
1XKWD49X23J386798 5MC444621BK011490 |
IA VF4102 IA DA5123 |
| February 2, 2026 | 000P120FJJ | HWY 3 / ELM ST - WAVERLY, IA | III | 1 | — | M S & SONS CORP | Truck Tractor Semi-trailer |
PTRB WABASH TANKS |
1NPXGGGG00D248885 5WSABB239TN653235 |
IA VA7059 IA ME7295 |
| 392.80A | Driving a commercial motor vehicle while Texting | Texting | ||||||||
| February 1, 2026 | 000P13X6CV | HWY 59, IA | III | 1 | — | — | Truck Tractor Semi-trailer |
PTRB WESTMOR INDUSTRIES |
0V2100005168863NE 1W9PH4026DM350329 |
IA FS1518 IA DA7779 |
| 392.2-SLLS2 | State/Local Laws - Speeding 6-10 miles per hour over the speed limit | Speeding 2 | ||||||||
Shippers Seen at Inspections
Shipper names recorded by roadside inspectors over roughly the last three years. Only inspected loads appear, so this is a sample of who the carrier hauls for, not a complete customer list. Names are as entered at the roadside; blanks and placeholders such as “N/A” or “same as carrier” are left out.
| Shipper | Inspections | Most recent |
|---|---|---|
| BORREGAARD | 3 | August 12, 2026 |
| PIONEER HI-BRED INTERNATIONAL INC | 3 | November 17, 2025 |
| PIONEER | 3 | November 3, 2025 |
| AGRO LIQUID | 2 | December 8, 2025 |
| M & S SONS | 2 | November 7, 2024 |
| FLINT HILLS RESOURCES | 1 | August 18, 2026 |
| RAMROD INDUSTRIES | 1 | April 23, 2026 |
| FBN | 1 | March 27, 2026 |
| CF | 1 | November 9, 2025 |
| NUTRIEN | 1 | August 26, 2025 |
| ENVIROTECH SERVICES INC | 1 | July 28, 2025 |
| BORREGAARD USA | 1 | March 28, 2025 |
13 more shippers named at fewer inspections.
History & Filings
Authority, insurance and process-agent records
Authority History
| Date | Status | Type |
|---|---|---|
| November 12, 2020 | DISCONTINUED REVOCATION | Common |
| October 13, 2020 | INVOLUNTARY REVOCATION | Common |
| October 3, 2018 | DISCONTINUED REVOCATION | Common |
| September 4, 2018 | INVOLUNTARY REVOCATION | Common |
| November 10, 2011 | DISCONTINUED REVOCATION | Common |
| November 3, 2011 | INVOLUNTARY REVOCATION | Common |
| July 8, 1985 | GRANTED | Common Carrier |
| July 8, 1985 | Active GRANTED | Motor Carrier of Property (Except Household Goods) |
| May 29, 1981 | GRANTED | Common Carrier |
| February 26, 1979 | GRANTED | Common Carrier |
Insurance & Revocation Filings
| Date | Type | Status |
|---|---|---|
| September 1, 2025 | BI&PD Primary/Excess | On file |
| August 6, 2021 | BI&PD Primary/Excess | On file |
| October 1, 2020 | BI&PD Primary/Excess | On file |
BOC-3 Process Agent
National Resident Agent Services, Inc.
1059 HARRIMAN CT, West Chester, PA, 19380-1330
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Data sourced from FMCSA MCMIS via Socrata. Record last updated: November 1, 2026.
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