Carrier profile · USDOT 1709075 · MC-627083 · Updated Jun 13, 2026
Sovereign Holdings Inc
3 power unitsSIOUX CITY, IA80/100
CARRIER ACTIVEMC-627083 ACTIVE
Identity & Federal
The official FMCSA identity — legal name, DBA, addresses, contact, officers, and registration — alongside the daily-captured federal-record activity feed, monitored daily by Vektor.
Location
- Physical address
- 5801 MITCHELL ST, SIOUX CITY, IA, 51111
- Mailing address
- P O BOX 649, NORTH SIOUX CITY, SD, 57049
- Operation
- Interstate
Contact
- Phone
- (712) 255-0274
- Cell
- (712) 253-6639
- mnylen@heparbio.com
- Web domain
- heparbio.com
Registration
- Officer
- Mark Nylen
- USDOT / docket
- 1709075 · MC-627083
- First registered
- Nov 16, 2007
- Last MCS-150
- Dec 2, 2013 · 30,000 mi (2012)
- FMCSA safety rating
- Not rated
- Recordable crash rate
- 0.00
- D-U-N-S
- —
Fleet (self-reported · MCS-150)
MCS-150 filing history· biennial-update cadence
Per-filing MCS-150 history (each biennial update + the fleet/mileage it reported) is being captured from the daily federal feed and will appear here as we capture the full history.
Federal record activity· monitored daily by Vektor
No licensing or insurance changes captured since Vektor began monitoring this carrier (June 2026). Quiet is usually good.