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| Name | Full name | Active | Releases | Files |
| IGR | Infinite Grooves | 1999 — 2000 | 13 | 0 |
| iMAC | 1999 — 2001 | 2 | 0 | |
| iMD | Illusive Music Distribution | 1999 — 1999 | 1 | 0 |
| iMPG | Internet Music Pirates Guild | 1998 — 2001 | 77 | 1 |
| IND | Independent | 1995 — Still active | 4 | 0 |
| INFINITY | Unknown — Unknown | 1 | 0 | |
| INTMP3 | Intensity MP3 | 1999 — 1999 | 2 | 0 |
| iRS | 1998 — 1998 | 0 | 0 | |
| ITD | Infinite Trading | 1998 — Unknown | 1 | 0 |
| iTS | Interrupting the Silence | 2000 — Still active | 0 | 0 |
| JKR | Unknown — Unknown | 1 | 0 | |
| KAOS | Unknown — Unknown | 1 | 0 | |
| Killah_ReCharge | Unknown — Unknown | 1 | 0 | |
| KSi | Kludge Sound Inc | 1999 — 2005 | 44 | 1 |
| kW | Klangwerk | 1999 — 2010 | 63 | 0 |
| L3aP | Layer 3 Audio Pirates | 1997 — Unknown | 0 | 1 |
| LB | Leetbeat | 1999 — 2001 | 1 | 0 |
| LOGOS | 2000 — 2004 | 0 | 0 | |
| LR | Last Resort | 1999 — 1999 | 1 | 0 |
| LtE | Lusty Trading Entreprise | 1997 — 2000 | 63 | 1 |
| M2S | 1999 — 1999 | 1 | 0 | |
| MAD | 1999 — 2000 | 27 | 0 | |
| MCS | Musical Charity Shop | 1999 — 1999 | 1 | 0 |
| MDK | Marduk | 1999 — 1999 | 1 | 0 |
| MELLOW | 1998 — Unknown | 2 | 0 | |
| MF | Ma Flibble | 1997 — Unknown | 1 | 0 |
| MGC | 1997 — 2007 | 176 | 1 | |
| MGM | Millenium Generation Music | 1999 — 1999 | 71 | 0 |
| MIL | Movimiento Internacional Latino | 1999 — 2007 | 1 | 0 |
| MP3HQ | MP3 Headquarters | 1999 — 1999 | 1 | 0 |