Since this isn’t going to be a one off thing, apparently:
Name of Car Company: Seongu
Owner of Company: @AndiD
Forum Thread: maybe at some point?
Country: (South) Korea
Established: 1946
Company ID: 1946047
Name of Car Company: Tochikura Motor Corporation
Owner of Company: @LamborghiniDude6
Forum Thread: Tochikura Motor Corporation
Country: Japan
Thread Created: 2022
Established: 1973
Company ID: 1973763
Name of Car Company: Ascot Automotive
Founder (owner) of company: Gerald Ascot (xsneakyxsimx)
Website or Forum thread: Ascot Automotive Appreciation Archive
Established: 17th May, 1922
Company ID: #1922056
Name of Car Company: Kolondra
Out-of-character owner of company: @MrdjaNikolen
Website or Forum thread: Nothing atm
CompanyID:1946181
Name of Car Company: Kontir
Out-of-character owner of company: @MrdjaNikolen
Website or Forum thread: Nothing atm
CompanyID:1946181
Name of Car Company: Saguaro
Out-of-character owner of company: @MrdjaNikolen
Website or Forum thread: Nothing atm
CompanyID:1946181
Name of Car Company: Ecyor Sllor
Out-of-character owner of company: @MrdjaNikolen
Website or Forum thread: Nothing atm
CompanyID:1890181
Name of Car Company: Daniloski
Out-of-character owner of company: @MrdjaNikolen
Website or Forum thread: Nothing atm
CompanyID:1946181
Name of Car Company: Sardarji
Out-of-character owner of company: @MrdjaNikolen
Website or Forum thread: Nothing atm
CompanyID:1946181
Name of Car Company: Rosanda
Out-of-character owner of company: @MrdjaNikolen
Website or Forum thread: Nothing atm
CompanyID:1946181
Name of Car Company: VerBanka
Out-of-character owner of company: @MrdjaNikolen
Website or Forum thread: Nothing atm
CompanyID:1946181
Will update if needed
Name of car company: Nerucci Motors Corporation
Owner of company: Davide Nerucci (04mmar)
Website or Forum thread: Nerucci Motors Corporation
Established: 1953
Company ID: #1953315
Name of Car Company: RIGEL MOTOR
Owner of company: @Skygel14
Country of origin: EU - Spain 
Website or Forum thread: RIGEL MOTOR - Spanish brand
Established: NOV 1987
Company ID: #19871414
Name of Car Company: Walton Auto Group
Owner of Company: @LamborghiniDude6
Forum Thread: Walton Auto Group
Country: USA
Thread Created: 2023
Established: 1929
Company ID: 1929810
Name of Car Company: Van Zandt Motor Company
Owner of Company: @VanZandt_Breda
Forum Thread: Van Zandt Motor Co
Country: USA
Thread Created: 2023
Established: 1942
Company ID: 2023426
Name of Car Company: JIOP Motors
Owner of company: jiop152
Website or Forum thread: Profile - JIOP12 - Automation (automationgame.com)
Country: Uruguay
Established: 1948 August 1st
Company ID: #1948853
Name of Car Company: Crystalline
Owner of company: it lurks in the dark
Established: May 15, 1972
Company ID: #1972135
Name of car company: Citadel International
Owner of company: severingwolf980#9048/Yokeeeer
Website or forum thread: Not yet in development
Country of origin: England - United Kingdom
Established: November 23rd 1889
Company ID: #1889673
Name of car Company: Helron
Owner of Company: IDK158
Website or Forum Thread: Helron Auto Company | Automation Lore Wiki | Fandom
Country of origin: USA
Established: 1945
Company ID: 1945060
Name of Car Company: Bergstrand Motor Company
Owner of company: Sully
Website or Forum thread: BMC- Bergstrand Motor Company
Origin: California, USA
Established: 2020 28th January
Company ID: #2020444
Name of car Company: Tiharris
Owner of Company: IDK158
Website of Forum Thread: Tiharris Luxury Automobiles | Automation Lore Wiki | Fandom
Country of Origin: UK
Established: 1945
Company ID: 1945007
Name of car Company: MALVA (Malmö Automobil och LastVagns Aktiebolag)
Owner of Company: Ch_Flash
Website of Forum Thread:
Country of Origin: Sweden
Established: 1945
Company ID: 1945404
1 Like
Name of Car Company: Dagel Premium Motor
Owner of company: @Skygel14 / DPM
Country of origin: EU - Spain / Canada 
Website or Forum thread:
Established: April 1996
Company ID: #19961414
Name of Car Company: MARUSSIA Motors
Owner of company: @bundaev
Country of origin: Russia
Website or Forum thread: Marussia
Established: 2007
Company ID: #2007178
Name of Car Company: Yuno Automobiles
Owner of company @TubroTerra
Country of origin: South Korea 
Website or Forum thread: Yuno Automobiles
Company ID: #46727
Name of Car Company: Dalluha Coach & Motor Works (DCMW)
Owner of company: @moroza
Country of origin: Dalluha
Established: mid-1930s
Company ID: #1935666
Name of Car Company: Norðwagen, DCMW subsidiary/rebadge. Nordwagen and Nordhwagen are acceptable spellings.
Owner of company: @moroza
Country of origin: nominally Hetvesia, de facto Dalluha
Established: 1963
Company ID: #1963666
4 Likes
Name of Car Company: Sportacc-Tyto Motoristica
Owner of company: The MiG
Established: 5th August, 2023
Country of Origin: 
Italy
Company ID: #2023203
Website or Forum thread: none
Company Groups, Brands and Departments
-
Sportacc Automobili (ICE cars)
Established: 14th December, 1946
Brands: Sportacc -
Tyto Automobili (electric vehicles)
Established: 29th July, 2023
Brands: Tyto, Ambra, Fuliggine, Facciagrigia, Maggiore -
Sportacc Competizioni (racing and development)
Established: 17th November, 1948
Departments: Sportacc Squadra Corse, Sportacc Sviluppo -
Sportacc Componenti (parts and components)
Established: 2nd March, 1955
Departments: Sportacc Metallurgica, Sportacc Tecnica, Sportacc Rivestimenti