6-K

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER
THE SECURITIES EXCHANGE ACT OF 1934

For the month of July 2018
Commission File Number: 001-36898

COLLIERS INTERNATIONAL GROUP INC.
(Translation of registrant's name into English)

1140 Bay Street, Suite 4000
Toronto, Ontario, Canada
M5S 2B4
(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.
Form 20-F [   ]      Form 40-F [ X ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): [  ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): [ ]

Indicate by check mark whether by furnishing the information contained in this Form, the Registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934:

Yes [  ]                                                    No [X]

If “Yes” is marked, indicate the file number assigned to the Registrant in connection with Rule 12g3-2(b):  N/A

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	COLLIERS INTERNATIONAL GROUP INC.
Date: July 31, 2018	/s/ John B. Friedrichsen
	Name: John B. Friedrichsen
	Title: Chief Financial Officer

EXHIBIT INDEX

Exhibit	Description of Exhibit
99.1	Press release dated July 31, 2018 announcing financial results for the second quarter ended June 30, 2018.
99.2	Supplemental slide presentation dated July 31, 2018.

EX-99.1

EXHIBIT 99.1

Colliers International Reports Second Quarter Results

Continuing strong growth in revenues and earnings

Operating highlights:

	Three months ended				Six months ended
	June 30				June 30
(in millions of US$, except EPS)	2018		2017		2018		2017
Revenues	$	667.4	$	586.2	$	1,219.8	$	1,052.5
Adjusted EBITDA (note 1)		69.4		60.3		105.6		91.5
Adjusted EPS (note 2)		0.95		0.77		1.39		1.13
GAAP operating earnings		45.6		41.2		61.3		54.1
GAAP EPS		0.60		0.29		0.72		0.32

TORONTO, July 31, 2018 (GLOBE NEWSWIRE) -- Colliers International Group Inc. (NASDAQ:CIGI) (TSX:CIGI) today reported operating and financial results for its second quarter ended June 30, 2018. All amounts are in US dollars.

Revenues for the second quarter were $667.4 million, a 14% increase (11% in local currency) relative to the same quarter in the prior year, adjusted EBITDA (note 1) was $69.4 million, up 15% (10% in local currency) and adjusted EPS (note 2) was $0.95, a 23% increase versus the prior year quarter. Second quarter adjusted EPS would have been approximately $0.05 lower excluding foreign exchange impacts. GAAP operating earnings were $45.6 million, relative to $41.2 million in the prior year period. GAAP diluted net earnings per common share was $0.60 in the quarter, versus $0.29 per share for the same quarter a year ago. Second quarter GAAP EPS would have been approximately $0.05 lower excluding changes in foreign exchange rates.

For the six months ended June 30, 2018, revenues were $1.22 billion, a 16% increase (12% in local currency) relative to the comparable prior year period, adjusted EBITDA was $105.6 million, up 15% (12% in local currency) and adjusted EPS was $1.39, a 23% increase versus the prior year period. Year-to-date adjusted EPS would have been approximately $0.06 lower excluding foreign exchange impacts. GAAP operating earnings were $61.3 million, relative to $54.1 million in the prior year period. GAAP diluted net earnings per common share for the six month period was $0.72, compared to $0.32 per share in the prior year period. Year-to-date GAAP EPS would have been approximately $0.06 lower excluding changes in foreign exchange rates.

“Once again, Colliers generated strong results in the second quarter, through a combination of acquisitions and solid internal growth. Based on results to date, current business pipelines and acquisitions completed subsequent to the quarter end, we remain optimistic about our growth prospects for the balance of the year,” said Jay S. Hennick, Chairman and CEO of Colliers International. “During the second quarter, we completed three acquisitions in our services business, in each case expanding to new markets within North America. We also successfully completed a private placement of €210 million of ten-year senior notes at an attractive fixed interest rate. And then, just after quarter-end we completed our strategic investment in Harrison Street Real Estate Capital, one of the largest real estate investment firms dedicated to the education, healthcare and storage sectors globally with approximately $15.6 billion in assets under management. Harrison Street, together with our existing European investment management business, will form the core of our new Investment Management platform with over $20 billion in assets under management from the world’s most respected institutional investors. With this important new platform for growth now in place, an investment-grade balance sheet, disciplined growth strategy and a proven track record of success, we are well positioned to continue creating value for shareholders in 2018 and beyond,” he concluded.

About Colliers International Group Inc.
Colliers International Group Inc. (NASDAQ:CIGI) (TSX:CIGI) is a top tier global real estate services and investment management company operating in 69 countries with a workforce of more than 13,000 professionals. Colliers is the fastest-growing publicly listed global real estate services and investment management company, with 2017 corporate revenues of $2.3 billion ($2.7 billion including affiliates). With an enterprising culture and significant employee ownership and control, Colliers professionals provide a full range of services to real estate occupiers, owners and investors worldwide, and through its investment management services platform, has more than $20 billion of assets under management from the world’s most respected institutional real estate investors.

Colliers professionals think differently, share great ideas and offer thoughtful and innovative advice to accelerate the success of its clients. Colliers has been ranked among the top 100 global outsourcing firms by the International Association of Outsourcing Professionals for 13 consecutive years, more than any other real estate services firm. Colliers is ranked the number one property manager in the world by Commercial Property Executive for two years in a row.

Colliers is led by an experienced leadership team with significant equity ownership and a proven record of delivering more than 20% annualized returns for shareholders, over more than 20 years.

For the latest news from Colliers, visit Colliers.com or follow us on Twitter: @Colliers and LinkedIn.

Consolidated Revenues

	Three months ended						Six months ended
(in thousands of US$)	June 30				Growth	Growth	June 30				Growth	Growth
(LC = local currency)	2018		2017		in US$ %	in LC %	2018		2017		in US$ %	in LC %
Outsourcing & Advisory	$	259,613	$	233,645	11%	8%	$	501,343	$	432,661	16%	11%
Lease Brokerage		221,889		180,384	23%	21%		389,623		325,212	20%	17%
Sales Brokerage		185,848		172,204	8%	5%		328,857		294,622	12%	8%
Total revenues	$	667,350	$	586,233	14%	11%	$	1,219,823	$	1,052,495	16%	12%

Consolidated revenues for the second quarter grew 11% on a local currency basis, with contributions from each service line. Consolidated internal revenue growth in local currencies was 5% (note 3) led by Lease Brokerage in all three geographic regions.

For the six months ended June 30, 2018, consolidated revenues grew 12% on a local currency basis. Year-to-date consolidated internal revenue growth in local currencies was 5% led by Lease Brokerage in all three geographic regions.

Segmented Quarterly Results
The Americas region’s revenues totalled $388.6 million for the second quarter compared to $346.5 million in the prior year quarter, up 12% (11% on a local currency basis). Local currency revenue growth was comprised of 7% internal growth and 4% growth from recent acquisitions. Internal growth for the quarter was driven by Lease Brokerage, particularly on the US West Coast and in Canada. Adjusted EBITDA was $36.2 million, versus $32.9 million in the prior year quarter. GAAP operating earnings were $26.8 million, versus $22.9 million in the prior year period.

EMEA region revenues totalled $149.6 million for the second quarter compared to $120.6 million in the prior year quarter, up 24% (15% on a local currency basis). Local currency revenue growth was comprised of 14% growth from recent acquisitions and 1% internal growth. Internal revenue growth was impacted by a decline in Outsourcing & Advisory Services, particularly project management activity, more than offset by increases in Sales and Lease Brokerage. Adjusted EBITDA was $21.5 million, versus $17.5 million in the prior year quarter. GAAP operating earnings were $14.0 million, versus $11.8 million in the prior year quarter.

Asia Pacific region revenues totalled $128.8 million for the second quarter compared to $118.7 million in the prior year quarter, up 9% (6% on a local currency basis). Local currency revenue growth was comprised of 4% growth from recent acquisitions and 2% internal growth. Adjusted EBITDA was $15.4 million, up from $12.7 million in the prior year quarter, benefitting from operating leverage. GAAP operating earnings were $13.5 million, versus $11.2 million in the prior year period.

Global corporate costs as reported in adjusted EBITDA were $3.6 million in the second quarter, relative to $2.8 million in the prior year period. The corporate GAAP operating loss for the second quarter was $8.7 million, relative to $4.6 million in the prior period, with the current period impacted by transaction costs related to the Harrison Street acquisition.

Conference Call
Colliers will be holding a conference call on Tuesday, July 31, 2018 at 11:00 a.m. Eastern Time to discuss the quarter’s results as well as the Harrison Street acquisition. The call, as well as a supplemental slide presentation, will be simultaneously web cast and can be accessed live or after the call at www.colliers.com in the “Shareholders / Newsroom” section.

Forward-looking Statements
This press release includes or may include forward-looking statements. Forward-looking statements include the Company’s financial performance outlook and statements regarding goals, beliefs, strategies, objectives, plans or current expectations. These statements involve known and unknown risks, uncertainties and other factors which may cause the actual results to be materially different from any future results, performance or achievements contemplated in the forward-looking statements. Such factors include: economic conditions, especially as they relate to commercial and consumer credit conditions and business spending; commercial real estate property values, vacancy rates and general conditions of financial liquidity for real estate transactions; the effects of changes in foreign exchange rates in relation to the US dollar on Canadian dollar, Euro, Australian dollar and UK pound sterling denominated revenues and expenses; competition in markets served by the Company; labor shortages or increases in commission, wage and benefit costs; disruptions or security failures in information technology systems; and political conditions or events, including elections, referenda, changes to international trade and immigration policies, and any outbreak or escalation of terrorism or hostilities.

Additional factors and explanatory information are identified in the Company’s Annual Information Form for the year ended December 31, 2017 under the heading “Risk Factors” (which factors are adopted herein and a copy of which can be obtained at www.sedar.com) and other periodic filings with Canadian and US securities regulators. Forward looking statements contained in this press release are made as of the date hereof and are subject to change. All forward-looking statements in this press release are qualified by these cautionary statements. Except as required by applicable law, Colliers undertakes no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise.

Summary financial information is provided in this press release. This press release should be read in conjunction with the Company's quarterly financial statements and MD&A to be made available on SEDAR at www.sedar.com.

Notes
1. Reconciliation of net earnings to adjusted EBITDA:

Adjusted EBITDA is defined as net earnings, adjusted to exclude: (i) income tax; (ii) other expense (income); (iii) interest expense; (iv) depreciation and amortization; (v) acquisition-related items; (vi) restructuring costs and (vii) stock-based compensation expense. We use adjusted EBITDA to evaluate our own operating performance and our ability to service debt, as well as an integral part of our planning and reporting systems. Additionally, we use this measure in conjunction with discounted cash flow models to determine the Company’s overall enterprise valuation and to evaluate acquisition targets. We present adjusted EBITDA as a supplemental measure because we believe such measure is useful to investors as a reasonable indicator of operating performance because of the low capital intensity of the Company’s service operations. We believe this measure is a financial metric used by many investors to compare companies, especially in the services industry. This measure is not a recognized measure of financial performance under GAAP in the United States, and should not be considered as a substitute for operating earnings, net earnings or cash flow from operating activities, as determined in accordance with GAAP. Our method of calculating adjusted EBITDA may differ from other issuers and accordingly, this measure may not be comparable to measures used by other issuers. A reconciliation of net earnings to adjusted EBITDA appears below.

	Three months ended						Six months ended
(in thousands of US$)	June 30						June 30
	2018			2017			2018			2017
Net earnings	$	28,804		$	25,957		$	37,343		$	32,757
Income tax		12,859			12,799			17,575			17,126
Other income, net		(33	)		(807	)		(460	)		(2,036	)
Interest expense, net		3,939			3,279			6,856			6,221
Operating earnings		45,569			41,228			61,314			54,068
Depreciation and amortization		16,283			14,381			32,141			26,408
Acquisition-related items		5,741			3,310			7,995			7,519
Restructuring costs		347			309			416			1,041
Stock-based compensation expense		1,487			1,030			3,701			2,473
Adjusted EBITDA	$	69,427		$	60,258		$	105,567		$	91,509

2. Reconciliation of net earnings and diluted net earnings per common share to adjusted net earnings and adjusted earnings per share:

Adjusted earnings per share is defined as diluted net earnings per common share, adjusted for the effect, after income tax, of: (i) the non-controlling interest redemption increment; (ii) amortization expense related to intangible assets recognized in connection with acquisitions; (iii) acquisition-related items; (iv) restructuring costs and (v) stock-based compensation expense. We believe this measure is useful to investors because it provides a supplemental way to understand the underlying operating performance of the Company and enhances the comparability of operating results from period to period. Adjusted earnings per share is not a recognized measure of financial performance under GAAP, and should not be considered as a substitute for diluted net earnings per share, as determined in accordance with GAAP. Our method of calculating this non-GAAP measure may differ from other issuers and, accordingly, this measure may not be comparable to measures used by other issuers. A reconciliation of net earnings to adjusted net earnings and of diluted net earnings per share to adjusted earnings per share appears below.

	Three months ended						Six months ended
(in thousands of US$)	June 30						June 30
	2018			2017			2018			2017
Net earnings	$	28,804		$	25,957		$	37,343		$	32,758
Non-controlling interest share of earnings		(3,547	)		(5,091	)		(4,216	)		(7,293	)
Amortization of intangible assets		8,779			7,915			17,368			13,965
Acquisition-related items		5,741			3,310			7,995			7,519
Restructuring costs		347			309			416			1,041
Stock-based compensation expense		1,487			1,030			3,701			2,473
Income tax on adjustments		(2,550	)		(2,456	)		(4,973	)		(4,466	)
Non-controlling interest on adjustments		(1,206	)		(885	)		(2,050	)		(1,729	)
Adjusted net earnings	$	37,855		$	30,089		$	55,584		$	44,268
	Three months ended						Six months ended
(in US$)	June 30						June 30
	2018			2017			2018			2017
Diluted net earnings per common share	$	0.60		$	0.29		$	0.72		$	0.32
Non-controlling interest redemption increment		0.03			0.25			0.11			0.33
Amortization of intangible assets, net of tax		0.14			0.13			0.28			0.22
Acquisition-related items		0.13			0.08			0.18			0.18
Restructuring costs, net of tax		0.01			-			0.01			0.02
Stock-based compensation expense, net of tax		0.04			0.02			0.09			0.06
Adjusted earnings per share	$	0.95		$	0.77		$	1.39		$	1.13

3. Local currency revenue growth rate and internal revenue growth

Percentage revenue variances presented on a local currency basis are calculated by translating the current period results of our non-US dollar denominated operations to US dollars using the foreign currency exchange rates from the periods against which the current period results are being compared. Percentage revenue variances presented on an internal growth basis are calculated assuming acquired entities were owned for the entire current period as well as the entire prior period. Revenue from acquired entities is estimated based on the operating performance of each acquired entity for the year prior to the acquisition date. We believe that these revenue growth rate methodologies provide a framework for assessing the Company’s performance and operations excluding the effects of foreign currency exchange rate fluctuations and acquisitions. Since these revenue growth rate measures are not calculated under GAAP, they may not be comparable to similar measures used by other issuers.

COLLIERS INTERNATIONAL GROUP INC.
Condensed Consolidated Statements of Earnings
(in thousands of US dollars, except per share amounts)
				Three months						Six months
				ended June 30						ended June 30
(unaudited)				2018			2017			2018			2017
Revenues			$	667,350		$	586,233		$	1,219,823		$	1,052,495
Cost of revenues				430,725			374,922			793,025			675,028
Selling, general and administrative expenses				169,032			152,392			325,348			289,472
Depreciation				7,504			6,466			14,773			12,443
Amortization of intangible assets				8,779			7,915			17,368			13,965
Acquisition-related items (1)				5,741			3,310			7,995			7,519
Operating earnings				45,569			41,228			61,314			54,068
Interest expense, net				3,939			3,279			6,856			6,221
Other income				(33	)		(807	)		(460	)		(2,036	)
Earnings before income tax				41,663			38,756			54,918			49,883
Income tax expense				12,859			12,799			17,575			17,126
Net earnings				28,804			25,957			37,343			32,757
Non-controlling interest share of earnings				3,547			5,091			4,216			7,293
Non-controlling interest redemption increment				1,410			9,530			4,314			12,750
Net earnings attributable to Company			$	23,847		$	11,336		$	28,813		$	12,714
Net earnings per common share
	Basic		$	0.61		$	0.29		$	0.74		$	0.33
	Diluted		$	0.60		$	0.29		$	0.72		$	0.32
Adjusted earnings per share (2)			$	0.95		$	0.77		$	1.39		$	1.13
Weighted average common shares (thousands)
		Basic		39,168			38,829			39,108			38,775
		Diluted		39,842			39,317			39,752			39,212

Notes to Condensed Consolidated Statements of Earnings
(1) Acquisition-related items include transaction costs, contingent acquisition consideration fair value adjustments, and contingent acquisition consideration-related compensation expense.
(2) See definition and reconciliation above.
(3) New US GAAP revenue guidance was adopted effective January 1, 2018 which had the impact of (i) increasing the proportion of reimbursable expenses related to property management activities accounted for as revenue on a gross basis, with no impact on earnings and (ii) accelerating the recognition of revenue related to certain Lease Brokerage transactions, with an accompanying immaterial increase to earnings. The Company also restated its results for the three- and six-month periods ended June 30, 2017 to reflect the impact of the adoption.

Condensed Consolidated Balance Sheets
(in thousands of US dollars)
(unaudited)		June 30, 2018		December 31, 2017		June 30, 2017
Assets
Cash and cash equivalents		$	104,246	$	108,523	$	122,982
Accounts receivable			446,515		487,279		406,938
Prepaids and other assets			81,520		68,556		62,479
	Current assets		632,281		664,358		592,399
Other non-current assets			83,624		72,736		65,802
Fixed assets			83,899		83,899		78,048
Deferred income tax			41,251		48,401		59,999
Goodwill and intangible assets			738,251		638,166		628,464
	Total assets	$	1,579,306	$	1,507,560	$	1,424,712
Liabilities and shareholders' equity
Accounts payable and accrued liabilities		$	507,168	$	646,722	$	458,245
Other current liabilities			60,935		75,494		66,067
Long-term debt - current			1,614		2,426		3,312
	Current liabilities		569,717		724,642		527,624
Long-term debt - non-current			418,223		247,467		424,120
Other liabilities			80,554		67,904		69,483
Deferred income tax			23,988		19,044		16,538
Redeemable non-controlling interests			156,602		145,489		137,855
Shareholders' equity			330,222		303,014		249,092
	Total liabilities and equity	$	1,579,306	$	1,507,560	$	1,424,712
Supplemental balance sheet information
Total debt		$	419,837	$	249,893	$	427,432
Total debt, net of cash			315,591		141,370		304,450
Net debt / pro forma adjusted EBITDA ratio			1.2		0.6		1.3

Consolidated Statements of Cash Flows
(in thousands of US dollars)
			Three months ended						Six months ended
			June 30						June 30
(unaudited)			2018			2017			2018			2017
Cash provided by (used in)
Operating activities
Net earnings		$	28,804		$	25,957		$	37,343		$	32,757
Items not affecting cash:
	Depreciation and amortization		16,283			14,381			32,141			26,408
	Deferred income tax		1,792			1,519			1,399			3,366
	Other		8,717			7,824			16,543			16,044
			55,596			49,681			87,426			78,575
Net change from assets/liabilities
	Accounts receivable		(12,612	)		(22,029	)		38,655			10,951
	Prepaids and other assets		(483	)		(1,462	)		4,373			(11,074	)
	Payables and accruals		11,960			29,546			(152,589	)		(107,103	)
	Other		(4,100	)		4,443			(4,838	)		7,592
	Contingent acquisition consideration paid		-			-			(2,856	)		(301	)
Net cash provided by (used in) operating activities			50,361			60,179			(29,829	)		(21,360	)
Investing activities
Acquisition of businesses, net of cash acquired			(18,848	)		(21,360	)		(98,580	)		(51,003	)
Purchases of fixed assets			(7,781	)		(13,768	)		(13,990	)		(20,501	)
Other investing activities			(13,498	)		(6,425	)		(17,960	)		(17,021	)
Net cash used in investing activities			(40,127	)		(41,553	)		(130,530	)		(88,525	)
Financing activities
Increase in long-term debt, net			(14,472	)		17,215			172,361			157,352
Purchases of non-controlling interests, net			-			(5,594	)		(73	)		(29,876	)
Dividends paid to common shareholders			-			-			(1,947	)		(1,932	)
Distributions paid to non-controlling interests			(7,399	)		(6,874	)		(12,603	)		(10,992	)
Other financing activities			(170	)		(339	)		(2,689	)		(400	)
Net cash provided by (used in) financing activities			(22,041	)		4,408			155,049			114,152
Effect of exchange rate changes on cash			4,404			2,253			1,033			5,567
Increase (decrease) in cash and cash equivalents			(7,403	)		25,287			(4,277	)		9,834
Cash and cash equivalents, beginning of period			111,649			97,695			108,523			113,148
Cash and cash equivalents, end of period		$	104,246		$	122,982		$	104,246		$	122,982

Segmented Results
(in thousands of US dollars)
					Asia
(unaudited)	Americas		EMEA		Pacific		Corporate			Consolidated
Three months ended June 30
2018
Revenues	$	388,606	$	149,566	$	128,796	$	382		$	667,350
Adjusted EBITDA		36,176		21,458		15,366		(3,573	)		69,427
Operating earnings		26,800		13,950		13,471		(8,652	)		45,569
2017
Revenues	$	346,478	$	120,574	$	118,670	$	511		$	586,233
Adjusted EBITDA		32,915		17,472		12,685		(2,815	)		60,257
Operating earnings		22,863		11,809		11,163		(4,607	)		41,228
					Asia
	Americas		EMEA		Pacific		Corporate			Consolidated
Six months ended June 30
2018
Revenues	$	717,108	$	265,283	$	236,631	$	801		$	1,219,823
Adjusted EBITDA		62,631		21,027		26,583		(4,674	)		105,567
Operating earnings		46,806		4,379		22,845		(12,716	)		61,314
2017
Revenues	$	630,300	$	211,345	$	209,869	$	981		$	1,052,495
Adjusted EBITDA		55,350		21,173		19,581		(4,596	)		91,508
Operating earnings		35,557		10,834		16,674		(8,997	)		54,068

COMPANY CONTACTS:

Jay S. Hennick
Chairman & CEO                       

John B. Friedrichsen
CFO 

(416) 960-9500

EX-99.2

EXHIBIT 99.2

Colliers International Group Inc. Second Quarter 2018 Financial Results July 31, 2018

Forward - Looking Statements This presentation includes or may include forward - looking statements. Forward - looking statements include the Company’s financial performance outlook and statements regarding goals, beliefs, strategies, objectives, plans or current expectations. These sta tem ents involve known and unknown risks, uncertainties and other factors which may cause the actual results to be materially different from a ny future results, performance or achievements contemplated in the forward - looking statements. Such factors include: economic conditions, especiall y as they relate to commercial and consumer credit conditions and business spending; commercial real estate property values, vacancy ra tes and general conditions of financial liquidity for real estate transactions; the effects of changes in foreign exchange rates in r ela tion to the US dollar on Canadian dollar, Australian dollar, UK pound sterling and Euro denominated revenues and expenses; competition in markets s erv ed by the Company; labor shortages or increases in commission, wage and benefit costs; disruptions or security failures in information tec hnology systems; and political conditions or events, including elections, referenda, changes to international trade and immigration p oli cies and any outbreak or escalation of terrorism or hostilities. Additional factors and explanatory information are identified in the Company’s Annual Information Form for the year ended Dec emb er 31, 2017 under the heading “Risk Factors” (which factors are adopted herein and a copy of which can be obtained at www.sedar.com) an d other periodic filings with Canadian and US securities regulators. Forward looking statements contained in this presentation are ma de as of the date hereof and are subject to change. All forward - looking statements in this press release are qualified by these cautionary stateme nts. Except as required by applicable law, Colliers undertakes no obligation to publicly update or revise any forward - looking statement, whethe r as a result of new information, future events or otherwise. Non - GAAP measures This presentation makes reference to the non - GAAP measures Adjusted EBITDA and Adjusted EPS. Please refer to Appendix for reconciliations to GAAP measures. 2

3 Second Quarter 2018 Results • Strong second quarter results • Quarterly revenues up 14% (11% in local currencies) with internal growth of 5% • Adjusted EPS of $0.95, up 23% from the prior year quarter • Issued € 210 million of senior unsecured notes, with a ten - year term and fixed interest rate of 2.23% • Total of six acquisitions completed so far this year, three acquisitions in the second quarter (Utah, Winnipeg, Pittsburgh) • In July 2018, Colliers completed strategic investment in Harrison Street Real Estate Capital LLC (“Harrison Street”), acquisition of Sadolin & Albæk (Denmark) and divestiture of Finnish residential property management operations • 2018 results reflect the adoption of new US GAAP revenue recognition standard; immaterial impact to earnings. 2017 results have been restated for the impact of adoption.

4 Second Quarter 2018 Results Summary (US$ millions, except per share amounts) (1) Local currency (“LC”) basis, excluding the effects of foreign currency exchange rate fluctuations USD LC (1) Revenue 667.4 586.2 14% 11% Adjusted EBITDA 69.4 60.3 15% 10% Adjusted EBITDA Margin 10.4% 10.3% Adjusted EPS 0.95 0.77 23% GAAP Operating Earnings 45.6 41.2 11% GAAP Operating Earnings Margin 6.8% 7.0% GAAP EPS 0.60 0.29 107% USD LC (1) Revenue 1,219.8 1,052.5 16% 12% Adjusted EBITDA 105.6 91.5 15% 12% Adjusted EBITDA Margin 8.7% 8.7% Adjusted EPS 1.39 1.13 23% GAAP Operating Earnings 61.3 54.1 13% GAAP Operating Earnings Margin 5.0% 5.1% GAAP EPS 0.72 0.32 125% Q2 2018 Q2 2017 % Change over Q2 2017 YTD 2018 YTD 2017 % Change over YTD 2017

5 Second Quarter Consolidated Revenues (US$ millions) (1) Outsourcing & Advisory services include: Corporate Solutions, Valuation & Advisory Services, Property and Asset Manageme nt Services, Project Management, Workplace Solutions, Property Marketing and Research Services. 221.9 180.4 185.8 172.2 259.6 233.6 667.4 586.2 2018 2017 Q2 Revenues Outsourcing & Advisory (1) Sales Brokerage Lease Brokerage % Change over Q2 2017 USD LC Outsourcing & Advisory 11% 8% Sales Brokerage 8% 5% Lease Brokerage 23% 21% Total 14% 11% Revenue Mix Q2 2018 Q2 2017 Outsourcing & Advisory 39% 40% Sales Brokerage 28% 29% Lease Brokerage 33% 31% Total 100% 100%

6 (1) Q2 2018 GAAP Operating Earnings: $26.8M Americas, $14.0M EMEA, $13.5M Asia Pacific (2) Q2 2017 GAAP Operating Earnings: $22.9M Americas, $11.8M EMEA, $11.2M Asia Pacific Q2 2018 Revenues Q2 2018 Adjusted EBITDA 1 Second Quarter Geographic Split (US$ millions) 58% 23% 19% Americas 388.6 EMEA 149.6 Asia Pacific 128.8 Q2 2017 Revenues Americas 346.5 EMEA 120.6 Asia Pacific 118.7 59% 21% 20% Q2 2017 Adjusted EBITDA 2 Americas 36.2 EMEA 21.5 Asia Pacific 15.4 50% 29% 21% 52% 28% 20% Americas 32.9 EMEA 17.5 Asia Pacific 12.7

7 (1) Outsourcing & Advisory services include: Corporate Solutions, Valuation & Advisory Services, Property and Asset Management Services, Project Management, Workplace Solutions, Property Marketing and Research Services Revenue Americas (US$ millions) Adjusted EBITDA 2 (Adjusted EBITDA Margin) • Revenues up 11% in local currencies, with 7% from internal growth and 4% growth from recent acquisitions • Internal growth driven by leasing volumes, particularly in the US West region and Canada • Adjusted EBITDA up 10% with margins relatively flat Outsourcing & Advisory (1) Sales Brokerage Lease Brokerage USD LC Internal Growth (LC) Revenue Growth 12% 11% 7% (2) GAAP Operating Earnings: Q2 2018 $26.8M at 6.9% margin ; Q2 2017 $22.9M at 6.6% margin 161.1 131.1 105.0 100.6 122.5 114.8 388.6 346.5 Q2 2018 Q2 2017 36.2 32.9 9.3% 9.5% Q2 2018 Q2 2017

8 (1) Outsourcing & Advisory services include: Corporate Solutions, Valuation & Advisory Services, Property and Asset Management Services, Project Management, Workplace Solutions, Property Marketing and Research Services Revenue EMEA (US$ millions) Adjusted EBITDA 2 (Adjusted EBITDA Margin) • Revenues up 15% in local currencies, with 14% growth from recent acquisitions and 1% from internal growth • Internal growth impacted by transaction timing and reduced project management activity • Adjusted EBITDA up 23% with margins relatively consistent to prior year Outsourcing & Advisory (1) Sales Brokerage Lease Brokerage USD LC Internal Growth (LC) Revenue Growth 24% 15% 1% (2) GAAP Operating Earnings: Q2 2018 $14.0M at 9.3% margin ; Q2 2017 $11.8M at 9.8% margin 33.8 26.5 40.1 27.3 75.6 66.8 149.6 120.6 Q2 2018 Q2 2017 21.5 17.5 14.3% 14.5% Q2 2018 Q2 2017

9 (1) Outsourcing & Advisory services include: Corporate Solutions, Valuation & Advisory Services, Property and Asset Management Services, Project Management, Workplace Solutions, Property Marketing and Research Services Revenue Asia Pacific (US$ millions) Adjusted EBITDA 2 (Adjusted EBITDA Margin) • Revenues up 6% in local currencies, with 4% growth from recent acquisitions and 2% from internal growth • Adjusted EBITDA up 21% with margin improvement from operating leverage particularly in Asia Outsourcing & Advisory (1) Sales Brokerage Lease Brokerage (2) GAAP Operating Earnings: Q2 2018 $13.5M at 10.5% margin; Q2 2017 $11.2M at 9.4% margin 27.0 22.8 40.7 44.3 61.1 51.6 128.8 118.7 Q2 2018 Q2 2017 15.4 12.7 11.9% 10.7% Q2 2018 Q2 2017 USD LC Internal Growth (LC) Revenue Growth 9% 6% 2%

10 1 Includes business acquisitions, contingent acquisition consideration and purchase of non - controlling interests in subsidiaries. Capitalization & Capital Allocation (US$ millions) Highlights • Expanded ($1 billion capacity) and extended (April 2023) credit facility • € 210 million 10 year senior notes at 2.23% completed May 30, 2018 • Net debt / pro forma adjusted EBITDA leverage of 1.2x at June 30, 2018 down from 1.3x in the prior year quarter • 2018 acquisition momentum continued subsequent to quarter - end with Denmark and Harrison Street acquisitions bringing pro forma leverage to ~2.4x • Anticipated capital expenditures of $40 - 42 million in 2018 driven by investments in office space and IT systems/software Cash $ 104.2 $ 108.5 $ 123.0 Total Debt 419.8 249.9 427.4 Net Debt $ 315.6 $ 141.4 $ 304.4 Redeemable non- controlling interests 156.6 145.5 137.9 Shareholders' equity 330.2 303.0 249.1 Total capitalization $ 802.4 $ 589.9 $ 691.4 Net debt / pro forma adjusted EBITDA 1.2 0.6 1.3 Capital Expenditures $ 7.8 $ 13.8 Acquisition Spend (1) $ 18.7 $ 27.8 Capital Expenditures $ 14.0 $ 20.5 Acquisition Spend (1) $ 109.0 $ 83.6 6 Months Ended June 30, 2018 June 30, 2017 June 30, 2018 December 31, 2017 June 30, 2017 3 Months Ended June 30, 2018 June 30, 2017

11 Looking Ahead 2018 Existing Business Outlook • Predicated on stable market conditions, including modest economic growth and increases to interest rates • Low to mid single - digit percentage internal revenue growth on full year basis plus mid single - digit revenue growth due to acquisitions • Adjusted EBITDA margin improvement of 20 - 30 bps Harrison Street Outlook • Expect revenues of $50 - 55 million for balance of 2018 • Expect adjusted EBITDA margin of 35 - 40% • 25% non - controlling interest share of earnings • Expect significant intangible asset amortization, which will impact GAAP earnings measures Consolidated Outlook • Consolidated income tax rate of 30 - 32% (including benefit of lower corporate tax rates under US Tax Reform) • Mid teen to 20% adjusted EPS growth on full year basis

Harrison Street Investment Management

49% 48% 3% Close End Funds Open End Funds Separate Accounts and Other $15.6B of AUM By Product Type Harrison Street Demographic Based Investing Differentiated Strategies Transformational Investment Establishes New Platform Student Housing Seniors Housing Storage Medical Office Investable Universe $2+ Trillion 13 Best in Class Returns Proven Track Record

14 Highly Regarded Investor Base • Diversified, global and loyal investor base • More than 245 investors • 70% of investors have invested in multiple Harrison Street funds • No one investor holds greater than 6% AUM, top 20 investors hold 43% of AUM Public Plans & Sovereign Entities 44.7% Corporate Plans 20.8% Multi - Managers & Fund of Funds 14.0% Endowments & Foundations 6.6% Banks & Insurance Companies 6.9% Family Offices 4.0% Other 2.9%

Investment Management Platform Stable Recurring Revenues 15 15%+ of Colliers EBITDA • Harrison Street and existing investment management business • Recurring revenue streams • $115 - $130 million • EBITDA margins of 35 - 40% • ~15% of Colliers annualized EBITDA • Strong growth potential • Positive industry dynamics • Leverage track records, culture and client focus to grow • Capitalize on Colliers’ global brand, platform and relationships $20+ Billion in AUM Positive industry dynamics Leverage platform & capabilities

Appendix Reconciliation of non - GAAP measures

17 Appendix Reconciliation of GAAP earnings to adjusted EBITDA (US$ thousands) Net earnings $ 28,804 $ 25,957 $ 37,343 $ 32,757 Income tax 12,859 12,799 17,575 17,126 Other income, net (33) (807) (460) (2,036) Interest expense, net 3,939 3,279 6,856 6,221 Operating earnings 45,569 41,228 61,314 54,068 Depreciation and amortization 16,283 14,381 32,141 26,408 Acquisition-related items 5,741 3,310 7,995 7,519 Restructuring costs 347 309 416 1,041 Stock-based compensation expense 1,487 1,030 3,701 2,473 Adjusted EBITDA $ 69,427 $ 60,258 $ 105,567 $ 91,509 Three months ended Six months ended June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017

18 Appendix Reconciliation of GAAP earnings to adjusted net earnings and adjusted earnings per share (US$ thousands) Net earnings $ 28,804 $ 25,957 $ 37,343 $ 32,757 Non-controlling interest share of earnings (3,547) (5,091) (4,216) (7,293) Amortization of intangible assets 8,779 7,915 17,368 13,965 Acquisition-related items 5,741 3,310 7,995 7,519 Restructuring costs 347 309 416 1,041 Stock-based compensation expense 1,487 1,030 3,701 2,473 Income tax on adjustments (2,550) (2,456) (4,973) (4,466) Non-controlling interest on adjustments (1,206) (885) (2,050) (1,729) Adjusted net earnings $ 37,855 $ 30,089 $ 55,585 $ 44,267 (US$) Diluted net earnings per common share $ 0.60 $ 0.29 $ 0.72 $ 0.32 Non-controlling interest redemption increment 0.03 0.25 0.11 0.33 Amortization of intangible assets, net of tax 0.14 0.13 0.28 0.22 Acquisition-related items 0.13 0.08 0.18 0.18 Restructuring costs, net of tax 0.01 - 0.01 0.02 Stock-based compensation expense, net of tax 0.04 0.02 0.09 0.06 Adjusted EPS $ 0.95 $ 0.77 $ 1.39 $ 1.13 Three months ended Six months ended June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017 Three months ended Six months ended June 30, 2018 June 30, 2017 June 30, 2018 June 30, 2017