Warrants may only be issued by a bank or other financial institution approved by the Australian Securities Exchange (ASX) as a warrant issuer.
ASX Operating Rules set out stringent criteria that an issuer must meet in order to be approved to issue warrants.
In brief, to be eligible to issue warrants, an institution must:
The table opposite sets out the approved issuers, including the letter that identifies the issuer as part of a warrant code.

Issuers have a central role in the warrants market.
Aside from issuing warrants, one of the most important functions of an issuer is to develop new products in response to investor demand. Over the years, warrant issuers have become very creative in structuring products to appeal to a wide range of investors. Because warrants are not a standardised product like exchange traded options, there is the flexibility to tailor products to suit specific investor needs.
Other responsibilities of the issuer include:

Warrant issuers have certain obligations in the interests of promoting a liquid market in which warrant holders can sell their warrants.
Under ASX Operating Rules, issuers have a choice.
They can ensure that the warrant series has an initial spread of holders that, in the opinion of ASX, is adequate and reasonable, or they can arrange for a market to be made in the warrant series on an ongoing basis. In practice, most issuers choose to meet their obligations by making a market.
'Making a market' means ensuring that a reasonable bid and volume is maintained in the market for a prescribed period of the trading day.
As a result, there should be a price quoted on the trading system at which warrant holders will be able to sell during most of the normal Trading Day. Warrant issuers will usually display an offer as well as a bid price.

For more details, please refer to Warrants market making on the ASX website.
Many warrant issuers publish an indicative pricing matrix for their warrants on a daily basis.
The matrix sets out various prices for the underlying for the day, and gives the issuer's expected bid/offer spread for the warrant for that underlying price.
These prices are not guaranteed, and should be used only as a guide. Changes in volatility or other price sensitive variables may mean that the issuer's buy/sell spread varies from that specified in the matrix.
You can find a warrant's indicative price matrix on the issuer's website. The issuer may also distribute the information via email.

Each time a warrant issuer issues a warrant, the terms and conditions of the warrant must be set out in a disclosure document, also known as a Product Disclosure Statement (PDS). The ASX Operating Rules and the Corporations Act specify the information and terms that must be included in this document.
The disclosure document contains information to help you assess the benefits, risks, features, rights and obligations associated with a warrant, and the issuer's capacity to fulfil its obligations.
Because warrants are not standardised, there can be significant differences between warrants offered by the various issuers, and even between different warrant series offered by the one issuer. It is therefore essential to read the PDS for a warrant you are considering investing in, to ensure that it is appropriate for your financial situation and objectives.
A warrant's disclosure document is available from:
Each warrant has a six-character ASX code, to distinguish it from the thousands of other warrants on issue.
The individual letters of the code describe some of the main features of the warrant:
For a detailed explanation of warrant codes, please refer to Understanding warrant codes.