Ms. Camilla Bartosiewicz reports

ALTUS GROUP ANNOUNCES COMPLETION OF SUBSTANTIAL ISSUER BID

Altus Group Ltd. has taken up and paid for 3,846,153 of its common shares at a price of $52.00 per share (the purchase price) under Altus Group's substantial issuer bid (the SIB) to repurchase for cancellation a number of its shares for an aggregate purchase price not to exceed $200-million.

The shares purchased under the SIB represent an aggregate purchase price of approximately $200-million and approximately 9.69 per cent of the total number of Altus Group's issued and outstanding shares (net of escrowed shares and on a non-diluted basis) as of April 21, 2026. After giving effect to the SIB, Altus Group will have approximately 35,836,266 shares issued and outstanding (net of 187,809 escrowed shares).

Based on the final calculation by TSX Trust Company, acting as depositary for the SIB, a total of 4,435,568 shares were validly tendered and not withdrawn. A total of 3,843,635 shares were taken up and purchased pursuant to auction tenders at the purchase price and purchase price tenders. Since the SIB was oversubscribed, shareholders who made auction tenders at or below the purchase price and shareholders who made, or were deemed to have made, purchase price tenders had approximately 87.13 per cent of their successfully tendered shares purchased by Altus Group (other than odd lot tenders, which were not subject to proration). A total of 2,518 shares were taken up and purchased pursuant to proportionate tenders.

Payment and settlement of the purchased shares will be effected by the depositary on or about April 29, 2026, in accordance with the SIB and applicable law. Any shares not purchased, including shares invalidly tendered, will be returned to shareholders promptly by the depositary.

The full details of the SIB are described in the offer to purchase and issuer bid circular dated March 16, 2026, as well as the related letter of transmittal and notice of guaranteed delivery, copies of which were filed and are available under our profile on SEDAR+.

To assist shareholders in determining the tax consequences of the SIB, Altus Group estimates that for the purposes of the Income Tax Act (Canada), the paid-up capital per share is approximately $18.57. Given that the purchase price exceeds the paid-up capital per share, shareholders who have sold shares to Altus Group under the SIB will be deemed to have received a taxable dividend as a result of such sale for Canadian federal income tax purposes equal to the amount by which the purchase price exceeds the paid-up capital per share. The dividend deemed to have been paid by Altus Group to Canadian resident persons is designated as an eligible dividend for purposes of the Income Tax Act (Canada) and any corresponding provincial and territorial tax legislation.

The specified amount for purposes of Subsection 191(4) of the Income Tax Act (Canada) is $49.68, being the closing trading price for the shares on the TSX on April 21, 2026.

Shareholders should consult with their own tax and other advisers with respect to the income tax consequences of the disposition of their shares under the SIB.

Following the completion of the SIB, Altus Group expects to resume purchases of shares shortly pursuant to the normal course issuer bid for its shares (the 2026 NCIB), and intends to continue purchasing shares thereunder until the expiry of the 2026 NCIB on Feb. 24, 2027, or such earlier date on which Altus Group has purchased the maximum number of shares permitted under the 2026 NCIB.

About Altus Group Ltd.

Altus Group is a leading provider of CRE intelligence, anchored by Argus -- the industry's go-to software for valuation and performance analytics. For more than two decades, Altus Group has played a vital role in empowering CRE professionals with the analytics and trusted advice they need to make high-impact decisions with confidence. The world's CRE leaders rely on the company's market-leading solutions and expertise to drive performance and manage risk. The company's people around the world are driving meaningful impact in an industry undergoing unprecedented change -- helping shape the cities where we live, work and build thriving communities.