Wurst Behavior
Chicago smash burgers made with two 3.5 oz house-ground Angus beef patties, plus house-made sausages, smoked kielbasa, Midwest BBQ and beer garden. Wurst Behavior, 4009 N Elston Ave.
Says it is part of Na Zdrowie Hospitality
Sources & updates
How this name was decided
the site's published name — stated on wurstbehavior.com, data.cityofchicago.org
Names weighed and not chosen
- Also declared in the site's markup: Earl's BBQ & Donuts — wurstbehavior.com
- Also declared in the site's markup: Na Zdrowie Hospitality — wurstbehavior.com
- Also declared in the site's markup: Pierogi Kitchen — wurstbehavior.com
- Also declared in the site's markup: Spoko — wurstbehavior.com
- Last observed
- Oct 28, 2026, 9:22 AM UTCRecent
- Record last changed
- Oct 28, 2026, 9:22 AM UTC
- Observations
- 48
- Sources read
- 26 of 27
This collection is not finished: 1 source (litigation) could not be read.
Legal Entities & Relationships
Na Zdrowie HospitalitySays it is part of
- the site says it is part of it — “Wurst Behavior is part of Na Zdrowie Hospitality — the same kielbasa tradition runs through the Pierogi Kitchen Kielbasa Platter in Wicker Park (Chicago Magazine's Top 25 Best Dishes of 2024), gets smoked out back at Spoko in Lincoln Park, and shares the smoker heritage of Earl's BBQ in Jefferson Park.” — wurstbehavior.com
MAS TACOS INC.Licensed operator of 1 of its locations
data.cityofchicago.org
Legal entities
MAS TACOS INC. Licensed operator of 1 of its locations · IL · CHICAGO BACP 497596
- Type
- Business account
- Premises
- 1 licensed premises of this record
Parties as filed
- MALGORZATA M PIENIAZEK (SECRETARY)
- MALGORZATA M PIENIAZEK (PRESIDENT)
The authority's own record of the operating entity, reached from its licence's account key at the subject's premises; owners and titles are as filed, not a current cap table.
View registration recordPublished by a third-party source · confirmed Oct 28, 2026, 9:22 AM UTC
- Observed via
- https://data.cityofchicago.org/resource/ezma-pppn.json?%24limit=100&%24offset=0&%24order=%3Aid&%24where=account_number%3D%27497596%27 → licence-proven operator MAS TACOS INC. on https://data.cityofchicago.org/resource/r5kz-chrr.json?%24limit=100&%24offset=0&%24order=expiration_date+DESC%2C%3Aid&%24where=%28UPPER%28doing_business_as_name%29%3D%27WURST+BEHAVIOR%27+OR+%28%28UPPER%28address%29+LIKE+%274009+%25%27+OR+UPPER%28address%29+LIKE+%274009-%25%27+OR+UPPER%28address%29+LIKE+%27%25-4009+%25%27%29+AND+UPPER%28address%29+LIKE+%27%25ELSTON%25%27%29%29+AND+%28UPPER%28city%29%3D%27CHICAGO%27+OR+UPPER%28zip_code%3A%3Atext%29+LIKE+%2760618%25%27+OR+%28%28city+IS+NULL+OR+city+%3D+%27%27%29+AND+%28zip_code+IS+NULL+OR+zip_code%3A%3Atext+%3D+%27%27%29%29%29+AND+%28UPPER%28license_description%29%3D%27CONSUMPTION+ON+PREMISES+-+INCIDENTAL+ACTIVITY%27+OR+UPPER%28license_description%29%3D%27TAVERN%27+OR+UPPER%28license_description%29%3D%27PACKAGE+GOODS%27+OR+UPPER%28license_description%29%3D%27SPECIAL+EVENT+LIQUOR%27+OR+UPPER%28license_description%29%3D%27CATERER%27%27S+LIQUOR+LICENSE%27+OR+UPPER%28license_description%29%3D%27NOT-FOR-PROFIT+CLUB%27+OR+UPPER%28license_description%29%3D%27CATERER%27%27S+REGISTRATION+%28LIQUOR%29%27+OR+UPPER%28license_description%29%3D%27LIQUOR+AIRPORT+PUSHCART+LICENSE%27+OR+UPPER%28license_description%29%3D%27RIVERWALK+VENUE+LIQUOR+LICENSE%27+OR+UPPER%28license_description%29%3D%27AIRPORT+PUSHCART+LIQUOR+O%27%27HARE+-+CLASS+A%27+OR+UPPER%28license_description%29%3D%27AIRPORT+PUSHCART+LIQUOR+MIDWAY+-+CLASS+A%27%29 → licence-proven operator MAS TACOS INC. on https://data.cityofchicago.org/resource/r5kz-chrr.json?%24limit=100&%24offset=0&%24order=expiration_date+DESC%2C%3Aid&%24where=%28UPPER%28doing_business_as_name%29%3D%27WURST+BEHAVIOR%27+OR+%28%28UPPER%28address%29+LIKE+%274009+%25%27+OR+UPPER%28address%29+LIKE+%274009-%25%27+OR+UPPER%28address%29+LIKE+%27%25-4009+%25%27%29+AND+UPPER%28address%29+LIKE+%27%25ELSTON%25%27%29%29+AND+%28UPPER%28city%29%3D%27CHICAGO%27+OR+UPPER%28zip_code%3A%3Atext%29+LIKE+%2760618%25%27+OR+%28%28city+IS+NULL+OR+city+%3D+%27%27%29+AND+%28zip_code+IS+NULL+OR+zip_code%3A%3Atext+%3D+%27%27%29%29%29+AND+%28UPPER%28license_description%29%3D%27RETAIL+FOOD+ESTABLISHMENT%27%29 → licence-proven operator MAS TACOS INC. on https://data.cityofchicago.org/resource/r5kz-chrr.json?%24limit=100&%24offset=0&%24order=expiration_date+DESC%2C%3Aid&%24where=UPPER%28legal_name%29+IN+%28%27MAS+TACOS+INC.%27%2C%27MAS+TACOS%2C+INC.%27%2C%27MAS+TACOS+INC%27%2C%27MAS+TACOS%2C+INC%27%2C%27MAS+TACOS+INCORPORATED%27%2C%27MAS+TACOS%2C+INCORPORATED%27%29+AND+%28UPPER%28license_description%29%3D%27CONSUMPTION+ON+PREMISES+-+INCIDENTAL+ACTIVITY%27+OR+UPPER%28license_description%29%3D%27TAVERN%27+OR+UPPER%28license_description%29%3D%27PACKAGE+GOODS%27+OR+UPPER%28license_description%29%3D%27SPECIAL+EVENT+LIQUOR%27+OR+UPPER%28license_description%29%3D%27CATERER%27%27S+LIQUOR+LICENSE%27+OR+UPPER%28license_description%29%3D%27NOT-FOR-PROFIT+CLUB%27+OR+UPPER%28license_description%29%3D%27CATERER%27%27S+REGISTRATION+%28LIQUOR%29%27+OR+UPPER%28license_description%29%3D%27LIQUOR+AIRPORT+PUSHCART+LICENSE%27+OR+UPPER%28license_description%29%3D%27RIVERWALK+VENUE+LIQUOR+LICENSE%27+OR+UPPER%28license_description%29%3D%27AIRPORT+PUSHCART+LIQUOR+O%27%27HARE+-+CLASS+A%27+OR+UPPER%28license_description%29%3D%27AIRPORT+PUSHCART+LIQUOR+MIDWAY+-+CLASS+A%27%29 → licence-proven operator MAS TACOS INC. on https://data.cityofchicago.org/resource/r5kz-chrr.json?%24limit=100&%24offset=0&%24order=expiration_date+DESC%2C%3Aid&%24where=UPPER%28legal_name%29+IN+%28%27MAS+TACOS+INC.%27%2C%27MAS+TACOS%2C+INC.%27%2C%27MAS+TACOS+INC%27%2C%27MAS+TACOS%2C+INC%27%2C%27MAS+TACOS+INCORPORATED%27%2C%27MAS+TACOS%2C+INCORPORATED%27%29+AND+%28UPPER%28license_description%29%3D%27RETAIL+FOOD+ESTABLISHMENT%27%29
- About
- MAS TACOS INC., the licensed operator of its premises
- Read from
- https://data.cityofchicago.org
- Interpreted by rule
- legal-entities/1
- Evidence ID
- legal-entity:11c5944a3fac859a9a761d6c
All published fields
- Scope
- The authority's own record of the operating entity, reached from its licence's account key at the subject's premises; owners and titles are as filed, not a current cap table.
- Reached
- account_key
- Premises
- 5fabac549bf423d6e9e4a4eec9be536b24b1b931adedcd5f52228c66515fb01f
- Legal Name
- MAS TACOS INC.
- Jurisdiction
- IL
- Registration
- Kind
- business_license
- Type
- Business account
- Number
- 497596
- Parties
- Kind
- person
- Name
- MALGORZATA M PIENIAZEK
- Role
- SECRETARY
- Kind
- person
- Name
- MALGORZATA M PIENIAZEK
- Role
- PRESIDENT
- Licensee
- MAS TACOS INC.
- Authority
- CHICAGO_BACP
- Source id
- il_chicago_owners
- Observed at
- 2026-10-28T09:22:44.022068388Z
- Jurisdiction
- IL
Relationship evidence
Identity revision 1, last changed
- a declared affiliated site is a relationship the publisher states, not common ownership
- a declared provider account (gift cards, hiring, ordering) is a service relationship, not an affiliation
- a register party at the business's premises is a candidate operator until the Place and legal resolvers bind it
- a licensed operator of the business's premises operates those locations; it is not thereby the brand's owner
- an employer a job board names on the openings posts them; it is not thereby the owner or the operator
- an app's store seller or developer publishes the app; neither is thereby the restaurant's owner
- a menu that names a producer names it; it is not a supply contract, a volume or an exclusivity
- a mail or DMARC service domain in DNS is a technical service relationship, not an affiliation
- a group the site says it is part of is a public affiliation; the equity chain and buying rights are separate questions
- an organization that posts the openings, sells the app or holds a program account shares services with the business; that is not affiliation or ownership
- a supplier or charitable partner the site's own page names and links is the publisher's statement; it is not a contract, a volume, an exclusivity or a gift amount
- Published nameWurst Behavior
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com → declared Organization name
- First observed
- Oct 28, 2026, 9:21 AM UTC
- Read from
- https://wurstbehavior.com
- Published descriptionChicago smash burgers made with two 3.5 oz house-ground Angus beef patties, plus house-made sausages, smoked kielbasa, Midwest BBQ and beer garden. Wurst Behavior, 4009 N Elston Ave.
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com/
- First observed
- Oct 28, 2026, 9:21 AM UTC
- Read from
- https://wurstbehavior.com
- Declared languageen
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com/
- First observed
- Oct 28, 2026, 9:21 AM UTC
- Read from
- https://wurstbehavior.com
- Canonical URLhttps://www.wurstbehavior.com/
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com/
- First observed
- Oct 28, 2026, 9:21 AM UTC
- Read from
- https://wurstbehavior.com
- Copyright line© 2026 Wurst Behavior
Directly observed · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com/
- First observed
- Oct 28, 2026, 9:21 AM UTC
- Read from
- https://wurstbehavior.com
- Na Zdrowie Hospitality
Na Zdrowie Hospitality
About a party this site's own evidence does not bind to the business
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com
- First observed
- Oct 28, 2026, 9:21 AM UTC
- About
- a party this site's own evidence does not bind to the business
- Read from
- https://wurstbehavior.com
- Wurst BehaviorWurst Behavior · url: https://www.wurstbehavior.com/
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com
- First observed
- Oct 28, 2026, 9:21 AM UTC
- Read from
- https://wurstbehavior.com
- Site icon
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com/
- Read from
- https://wurstbehavior.com
Wurst Behavior Employees & Ownership
The latest people collection is incomplete. Previously confirmed people remain available with their original dates.
Artur WnorowskiChef
- Also named Art WnorowskiSource not recorded
Stated by 8 sources
- https://wurstbehavior.com · Published person (named with a role or their own mailbox on the site) · Chef
- https://wurstbehavior.com · Published person (schema.org)
- https://wurstbehavior.com/ · Published person (schema.org)
- https://earlsbbqchicago.com/ · Published person (schema.org)
- https://pierogikitchenchicago.com/ · Published person (schema.org)
- https://spoko-chicago.com · Published person (schema.org)
- https://spoko-chicago.com/ · Published person (schema.org)
- https://thirdcoastreview.com/food/2024/11/21/food-restaurant-preview-wurst-behavior · Person named with a role in an article about the business · Chef
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- First observed
- Oct 28, 2026, 9:21 AM UTC
Gosia Pieniazek
Stated by 6 sources
- https://wurstbehavior.com · Published person (schema.org)
- https://wurstbehavior.com/ · Published person (schema.org)
- https://earlsbbqchicago.com/ · Published person (schema.org)
- https://pierogikitchenchicago.com/ · Published person (schema.org)
- https://spoko-chicago.com · Published person (schema.org)
- https://spoko-chicago.com/ · Published person (schema.org)
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- First observed
- Oct 28, 2026, 9:21 AM UTC
Gosia Pieniążek
Stated by 4 sources
- https://wurstbehavior.com · Published person (schema.org)
- https://wurstbehavior.com/ · Published person (schema.org)
- https://earlsbbqchicago.com/ · Published person (schema.org)
- https://pierogikitchenchicago.com/ · Published person (schema.org)
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- First observed
- Oct 28, 2026, 9:21 AM UTC
Louis Harrischieflast seen
Stated by 1 source
- https://thirdcoastreview.com/about-us · Person named with a role in an article about the business · chief
Published by a third-party source · confirmed Oct 28, 2026, 9:21 AM UTC
- First observed
- Oct 28, 2026, 9:21 AM UTC
MALGORZATA PIENIAZEKOWNERper the register
Roles
- OWNER at Wurst Behavior · MAS TACOS INC · share 0.00% · filed partyhttps://ilccportal.illinois.gov/s/sfsites/aura?r=1&aura.ApexAction.execute=1
- PRESIDENT · MAS TACOS INC. · filed partyhttps://data.cityofchicago.org/resource/ezma-pppn.json?%24limit=100&%24offset=0&%24order=%3Aid&%24where=account_number%3D%27497596%27
- SECRETARY · MAS TACOS INC. · filed partyhttps://data.cityofchicago.org/resource/ezma-pppn.json?%24limit=100&%24offset=0&%24order=%3Aid&%24where=account_number%3D%27497596%27
- Also named MALGORZATA M PIENIAZEKSource not recorded
Stated by 2 sources
- https://data.cityofchicago.org/resource/ezma-pppn.json?%24limit=100&%24offset=0&%24order=%3Aid&%24where=account_number%3D%27497596%27 · Named as a person on the authority's record of the operating entity, in the role it files · SECRETARY
- https://ilccportal.illinois.gov/s/sfsites/aura?r=1&aura.ApexAction.execute=1 · On the authority's record in the role it files; a person by its filed name (the register's SURNAME, GIVEN layout for a person) · OWNER
Person issues · 1
- Title
the sources state different capacities for the same organisation and interval; jobTitle projects the one more independent sources, a newer authority or a stronger source states, and the others are kept as titles
Selected source: https://ilccportal.illinois.gov/s/sfsites/aura?r=1&aura.ApexAction.execute=1
- https://data.cityofchicago.org/resource/ezma-pppn.json?%24limit=100&%24offset=0&%24order=%3Aid&%24where=account_number%3D%27497596%27
- PRESIDENT
- https://data.cityofchicago.org/resource/ezma-pppn.json?%24limit=100&%24offset=0&%24order=%3Aid&%24where=account_number%3D%27497596%27
- SECRETARY
Published by a third-party source · confirmed Oct 28, 2026, 9:22 AM UTC
- First observed
- Oct 28, 2026, 9:22 AM UTC
Job Postings
No open roles listed.
Hiring evidence
- Hiring statusno open role: no careers page or job board found; LinkedIn Jobs not searched: the site links no LinkedIn company of its own to read postings by; Indeed and ZipRecruiter not searched
Derived from observations
Contact Information
Phones
7736543122
773-654-3122
Published by the company · confirmed Oct 28, 2026, 9:21 AM UTC
- Observed via
- https://wurstbehavior.com
- First observed
- Oct 28, 2026, 9:21 AM UTC
Locations
Where is Wurst Behavior located?
1 known location
Chicago4009 N Elston Ave, IL, 60618, US
Location evidence
View location dataWebsite & Digital Technology
Who manages Wurst Behavior's domain and DNS?
wurstbehavior.com was first registered on October 8, 2024. Its registrar is Register.com - Network Solutions, LLC.
What web infrastructure does Wurst Behavior use?
Protocols: TLS 1.3 and HTTP/2.
How is Wurst Behavior's website secured?
HTTPS certificate: Let's Encrypt, expires December 25, 2026.
Does Wurst Behavior use DNSSEC?
DNSSEC was not enabled when observed.
View technology, DNS, network and security evidence
More website details
More website details
View mail records and evidence
Apps, Loyalty & Guest Technology
View apps, provider accounts and technical evidence
App store details: Nothing observed in this category.
Publisher files
Nothing observed in this category.
Feeds
Nothing observed in this category.
GitHub
Nothing observed in this category.
Additional site intelligence
Useful site-graph evidence is available on demand instead of being pre-rendered into every company profile.