It was another busy week for Australia's top brokers. This has led to the release of a number of broker notes.

Three broker buy ratings that you might want to know more about are summarised below. Here's why brokers think these ASX shares are in the buy zone:

Corporate Travel Management Ltd (ASX: CTD)

According to a note out of Morgans, its analysts have retained their add rating on this corporate travel specialist's shares with a reduced price target of $16.05. Morgans notes that Corporate Travel Management released a softer than expected quarterly update last week due to trade tariffs and macroeconomic uncertainty. While this means that the company is going to fall short of its guidance in FY 2025, Morgans thinks investors should look beyond this. Especially given that new client wins means that FY 2026 should be a strong year of earnings growth for the company. And looking further ahead, it notes that management is aiming to double its earnings by FY 2029. The Corporate Travel Management share price ended the week at $11.68.

Nextdc Ltd (ASX: NXT)

A note out of Goldman Sachs reveals that its analysts have retained their conviction buy rating on this data centre operator's shares with an improved price target of $16.50. Goldman lifted its valuation after NextDC signed a 52MW contract in Melbourne M3, which given it is an AI deployment, is expected to be fully billing by FY 2028. The broker believes that the company's strong earnings growth out to 2028 is now underwritten. And that doesn't include any other significant contracts that could be announced between now and then. Overall, Goldman continues to feel very positive about NextDC's outlook and thinks that its shares are trading at an unjustified discount to peers. It points out that its shares only trade on 19x EV/fully contracted EBITDA, which is below both trading multiples (24x to 30x) and recent transactions (21x to 42x). The NextDC share price was fetching $13.57 at Friday's close.

Orica Ltd (ASX: ORI)

Another note out of Goldman Sachs reveals that its analysts have retained their buy rating on this commercial explosives company's shares with an improved price target of $22.10. According to the note, Goldman was impressed with Orica's performance during the first half of FY 2025. It points out that the company's earnings were comfortably ahead of expectations thanks to the core Blasting Solutions business. Goldman also points out that the company is finally delivering earnings per share leverage, which has been absent in recent years as it deployed capital towards acquisitions. All in all, Goldman feels that Orica's shares look cheap in the context of demonstrated operational momentum. As a result, it thinks there's still plenty of upside from current levels. The Orica share price ended the week at $18.29.