ForoESC

Tika – I let my heart break
Record company: Sony Music

Neea Jokinen: Benjamin, Janne Ordén, ABREU. Most notable song: Janne Ordén - Sunnuntaisin (6,7 million streams in Spotify.)
Timo Oiva: According to descriptions I've found the guy seems to be mostly focusing on Asian market, but not much info about specific songs found. In Finland, he has composed Diandra - Vielä vapaa (over 127k streams in spotify)
Oliver @ i-One Music: ? Whoever this is, it seems to be connected to Taiwan
Lotus Wang: either 50 year old Taiwanese artist or some person with same name
Sami Tamminen: Ollie, Juno. Most notable song: Juno - Hätäraketteja (Audio) ft. Rosi (2,9 million streams in Spotify.)
Kalle Mäkipelto: Evelina, Pikku G, BEHM. Most notable song: Evelina - Kylmii Väreitä (12,5 million streams in Spotify). As a side note, while BEHM is a newcomer she have had one of the biggest hits of this fall. (song is called Hei Rakas)

Past UMK entry: Ida Bois - Kumbaya (Kalle Mäkipelto)

Erika Vikman – Cicciolina
Record company: Mökkitie Records

Janne Rintala, Mika Laakkonen: Arttu Wiskari. Most notable song; Arttu Wiskari - Suomen muotoisen pilven alla (8,6 million streams in Spotify)
Erika Vikman: idk
Saskia Vanhalakka: ?

Since it's kind of music people probs not listen here: Arttu Wiskari is pretty much as Finnish as Finnish music can get.

Past UMK entry: Eini - Draamaa (Janne Rintala, Mika Laakkonen)

Aksel Kankaanranta – Looking back
Record company: EMI Capitol

Joonas Angeria: Vesala, Isac Elliot, Robin, Julie Bergan... He probably has the widest CV when it comes to working with different artists, but those seems to be the one he worked the most. Most notable song: Julie Bergan - All hours (18,2 million streams)
Whitney Phillips: Celine Dion, Zara Larsson, Fifth Harmony, Kylie Minogue, Christina Aguilera.. her info seems to be all over for what songs she has been in however, and am tired to dig more soo here's just a link where u can read about her lol: https://whitneyphillips.com/
Connor McDonough, Riley McDonough, Toby McDonough: Before You Exit, which is their own band. Most notable song: Clouds (5,8 million streams in Spotify)

Past UMK entry: Satin Circus - Crossroads (Joonas Angeria)

F3M – Bananas
Record company: Kaiku Recordings

Olli Äkräs: Roope Salminen & Koirat, Maija Vilkkumaa, Jukka Poika, Nelli Matula. Most notable song: Nelli Matula - Helposti särkyvää (2,7 million streams in Spotify)
Hanna Ollikainen: ?
Rafael Elivuo: Aleksanteri Hakaniemi, TIPPA, Laura Voutilainen. Most notable song: Laura Voutilainen - Miks Ei (7,6 million streams in Spotify)

Sansa – Lover view
Record company: EMI Capitol (past album was with Playground music, but EMI capitol advertised her participation in their stories at least..)

Sansa: Her own discography, lol
Yotto: Himself, his work is more known in other countries though than here even if he's Finnish, he's been doing tours in North America and Australia. Most notable: Yotto - Odd one out (4,9 million streams in Spotify)
Anton Sonin: Reino Nordin, LCMDF. Most notable song: Reino Nordin - Antaudun (17,5 million streams in Spotify)

Catharina Zühlke – Eternity
Record company: D8 music (this is a small one, all other record companies are big ones)

Marcia Sondeijker: 2019
Roel Rats: 2019, Tamta - Sex with your Ex, Jæger - How About Mars
Josefin Myrberg: Participated in Swedish Idol bback in 2014
Henrik Tala: He works for the same record company where Erika is signed at, so he produces songs for Arttu Wiskari as well for example. Most notable song: KEiiNO - Spirit in the Sky (24,9 million streams in spotify). As a bonus mention, the song in the Danish selection atm (Kenny Duerlund - Forget It All).
Catharina Zühlke: As far as I know, nothing before, not even her past UMK entry.