18. Brand New Music

Artists under this label include: AB6IX, BDC, MXM
Top-selling albums from this label in 2021:
1. Mo’ Complete by AB6IX (101.6k sales)
2. Mo’ Complete: Have a Dream by AB6IX (93.4k sales)
3. Salute: A New Hope by AB6IX (71.7k sales)
Total album sales in 2021: 299.1k

17. TOP Media

Artists under this label include: MCND, UP10TION, Kim Wooseok
Top-selling albums from this label in 2021:
1. 2nd Desire [Tasty] by Kim Wooseok (97.3k sales)
2. Connection by UP10TION (49.7k sales)
3. The Earth: Secret Mission Chapter.1 by MCND (26.9k sales)
4. MCND Age by MCND (25.6k sales)
Total album sales in 2021: 311.8k

16. Konnect Entertainment

Artists under this label include: Kang Daniel
Top-selling albums from this label in 2021:
1. Yellow by Kang Daniel (320.1k sales)
Total album sales in 2021: 335.6k

15. EDAM Entertainment

Artists under this label include: IU
Top-selling albums from this label in 2021: 
1. Lilac by IU (393.0k sales)
Total album sales in 2021: 428.7k

14. Woollim Entertainment

Artists under this label include: INFINITE, Golden Child, Rocket Punch, DRIPPIN
Top-selling albums from this label in 2021:
1. Game Changer by Golden Child (148.2k sales)
2. Yes. by Golden Child (114.0k sales)
3. A Better Tomorrow by DRIPPIN (47.6k sales)
4. Ring Ring by Rocket Punch (26.7k sales)
Total album sales in 2021: 507.7k

13. Cube Entertainment

Artists under this label include: (G)I-DLE, BTOB, PENTAGON, CLC, LIGHTSUM
Top-selling albums from this label in 2021: 
1. I Burn by (G)I-DLE (211.9k sales)
2. Love or Take by PENTAGON (114.1k sales)
3. 4U: Outside by BTOB (83.1k sales)
5. Vanilla by LIGHTSUM (41.1k sales)
6. Windy by Soyeon (38.7k sales)
Total album sales in 2021: 522.5k

12. FNC Entertainment

Artists under this label include: SF9, Cherry Bullet, P1Harmony, CNBLUE, AOA, N.Flying, FTISLAND
Top-selling albums from this label in 2021:
1. Turn Over by SF9 (227.2k sales)
2. Rumination by SF9 (185.3k sales)
3. Disharmony: Break Out by P1Harmony (67.2k sales)
4. Man on the Moon by N.Flying (59.4k sales)
Total album sales in 2021: 587.8k

11. Fantagio

Artists under this label include: ASTRO, Weki Meki, Ong Seungwoo
Top-selling albums from this label in 2021:
1. All Yours by ASTRO (360.3k sales)
2. Switch On by ASTRO (309.8k sales)
3. I Am Me by Weki Meki (11.4k sales)
Total album sales in 2021: 731.2k

10. RBW

Artists under this label include: MAMAMOO, ONEUS, ONEWE, PURPLE KISS
Top-selling albums from this label in 2021:
1. Blood Moon by ONEUS (175.3k sales)
2. WAW by MAMAMOO (130.7k sales)
3. Devil by ONEUS (120.6k sales)
4. Binary Code by ONEUS (103.2k sales)
5. Redd by Wheein (76.8k sales)
6. Hide & Seek by PURPLE KISS (43.9k sales)
7. Guilty Pleasure by Hwasa (30.4k sales)
Total album sales in 2021: 867.6k

9. KQ Entertainment

Artists under this label include: ATEEZ, Block B
Top-selling albums from this label in 2021:
1. ZERO: FEVER Part.3 by ATEEZ (732.9k sales)
2. ZERO: FEVER Part.2 by ATEEZ (514.5k sales)
3. ZERO: FEVER Epilogue by ATEEZ (344.6k sales)
Total album sales in 2021: 1.43 million

8. Starship Entertainment 

Artists under this label include: MONSTA X, Cosmic Girls/WJSN, CRAVITY, Wonho, K.Will, Soyou
Top-selling albums from this label in 2021:
1. No Limit by MONSTA X (409.8k sales)
2. One of a Kind by MONSTA X (358.5k sales)
3. Season 3. Hideout: Be Our Voice by CRAVITY (176.5k sales)
4. The Awakening: Written in the Stars by CRAVITY (174.7k sales)
5. Love Synonym Pt.2: Right for Us by Wonho (105.1k sales)
6. Unnatural by Cosmic Girls/WJSN (92.6k sales)
Total album sales in 2021: 1.50 million

7. IST Entertainment

Artists under this label include: THE BOYZ, Apink, VICTON, Weeekly
Top-selling albums from this label in 2021: 
1. Thrill-ing by THE BOYZ (638.6k sales)
2. Maverick by THE BOYZ (628.0k sales)
3. Voice: The Future Is Now by VICTON (111.9k sales)
4. Play Game: Holiday by Weeekly (46.4k sales)
5. We Play by Weeekly (42.7k sales)
Total album sales in 2021: 1.71 million

6. BE:LIFT Labs

Artists under this label include: ENHYPEN
Top-selling albums from this label in 2021:
1. Dimension: Dilemma by ENHYPEN (1.18 million sales)
2. Border: Carnival by ENHYPEN (772.3k sales)
Total album sales in 2021: 2.13 million

5. YG Entertainment

Artists under this label include: BLACKPINK, BIGBANG, WINNER, iKON, TREASURE, Akdong Musician
Top-selling albums from this label in 2021:
1. LALISA by Lisa (762.9k sales)
2. R by Rosé (618.9k sales)
3. The First Step: Treasure Effect by TREASURE (351.0k sales)
4. Page by Yoon (123.8k sales)
Total album sales in 2021: 2.57 million

4. Pledis Entertainment

Artists under this label include: SEVENTEEN, NU’EST
Top-selling albums from this label in 2021:
1. Attacca by SEVENTEEN (2.06 million sales)
2. Your Turn by SEVENTEEN (1.47 million sales)
3. Romanticize by NU’EST (208.4k sales)
Total album sales in 2021: 4.10 million

3. JYP Entertainment

Artists under this label include: TWICE, Stray Kids, ITZY, DAY6, 2PM
Top-selling albums from this label in 2021: 
1. NOEASY by Stray Kids (1.29 million sales)
2. Formula of Love: O+T=<3 by TWICE (632.5k sales)
3. Crazy In Love by ITZY (487.6k sales)
4. Taste of Love by TWICE (557.4k sales)
5. Guess Who? by ITZY (331.7.k sales)
6. Must by 2PM (141.1k sales)
7. The Book of Us: Negentropy by DAY6 (110.1k sales)
Total album sales in 2021: 5.96 million

2. BigHit Music

Artists under this label include: BTS, TXT
Top-selling albums from this label in 2021:
1. Butter by BTS (2.96 million sales)
2. The Chaos Chapter: Freeze by TXT (859.2k sales)
3. The Chaos Chapter: Fight or Escape by TXT (745.0k sales)
Total album sales in 2021: 9.42 million

1. SM Entertainment

Artists under this label include: EXO, NCT, Red Velvet, SHINee, Super Junior, Girls’ Generation, aespa, TVXQ
Top-selling albums from this label in 2021:
1. Sticker by NCT 127 (2.43 million sales)
2. Hot Sauce by NCT Dream (2.09 million sales)
3. Don’t Fight the Feeling by EXO (1.30 million sales)
4. Favorite by NCT 127 (1.28 million sales)
5. Hello Future by NCT DREAM (1.28 million sales)
6. Bambi by Baekhyun (1.03 million sales)
7. Universe by NCT (933.4k sales)
8. The Renaissance by Super Junior (480.2k sales)
9. Don’t Call Me by SHINee (447.5k sales)
10. Queendom by Red Velvet (360.1k sales)
Total album sales in 2021: 17.41 million

Source : https://www.koreaboo.com/lists/kpop-companies-alone-made-nearly-album-sales-in-2021/