As you have asked about the methanol manufacturer companies who are members of Methanol Institute (MI), I am mentioning them, check below for the details

Atlantic Methanol Production Companies
BP Chemicals
Carbon Recycling International
Clariant
Colonial Chemical Solutions
Coogee Chemicals Pty. Ltd.
Ecofuel SpA
Fuel Freedom Foundation
G2X Energy
Haldor Topsoe
HELM AG
IMTT
Johnson Matthey
Lanxess
Metafrax
Methanex
Methanol Holdings Trinidad Limited
Metor S.A.
Mitsubishi Gas Chemical America
Mitsubishi International Corporation
Mitsui
NW Innovation Works
Oberon Fuels
OCI N.V.
Oman Methanol Company, LLC
Oorja Protonics
Petronas Chemical Group
Qafac
Recochem, Inc.
SABIC Asia Pacific Pte Ltd.
Salalah Methanol Company, LLC
SCC Distribution
Sipchem
Solvadis Group
Southern Chemical Corporation
Tricon Energy, Inc.
Unipex Solutions Canada, Inc.
Vitol
Vitusa Products, Inc.