Exhibit 99.1

Maxar Technologies Provides Business Updates

Announces amendment to credit agreement

Continues to explore strategic alternatives for GEO communications satellite line of business

Westminster, CO, – December 21, 2018 –  Maxar Technologies (NYSE:MAXR) (TSX:MAXR) ("Maxar" or the "Company"), today announced that it received approval from its bank lenders on December 21, 2018, to amend the Company's credit agreement (“Amended Agreement”), effective today. The Company also confirmed that it is continuing to explore and evaluate a range of strategic alternatives for its GEO communications satellite line of business.

Amended Credit Agreement

The Amended Agreement provides the Company additional financial flexibility with regard to its consolidated debt leverage ratio. The Company expects to stay within its financial covenants through the maturity date of the credit facility.

The Amended Amendment increases the maximum consolidated debt leverage ratio as follows:

"We appreciate the continued support of our lenders and their confidence in our business and our ability to pay down debt,” said Howard Lance, Maxar CEO. “We remain focused on continuing to grow the company, deliver strong cash generation to reduce future leverage, and deliver value for our shareholders.”

A copy of the Amended Agreement will be filed with the Canadian securities regulatory authorities and will be available under the Company's SEDAR profile

at  www.sedar.com , under the Company's EDGAR profile at  www.sec.gov  and on the Company's website at  www.maxar.com .

Update on GEO Communications Satellite Line of Business

As previously announced, during the Company’s third quarter earnings call on October 31, 2018, Maxar management targeted December 31, 2018 to announce a final decision regarding the strategic direction of its GEO communications satellite business. The Company expects to make a decision on the future strategic direction of the GEO communications satellite business in due course and will provide an update to shareholders in early 2019. Further updates will be provided as conditions warrant.

The Company continues to take actions to right size its GEO business footprint and workforce. On December 6, 2018, Maxar announced that it has completed the sale of SSL’s Building 1 facility in Palo Alto, California, for $70 million in cash. The Company will use the net proceeds from this transaction to pay down debt. SSL also continues to be actively engaged with its customers to procure additional GEO satellite orders.

About Maxar Technologies

As a global leader of advanced space technology solutions, Maxar Technologies is at the nexus of the new space economy, developing and sustaining the infrastructure and delivering the information, services, systems that unlock the promise of space for commercial and government markets. As a trusted partner, Maxar Technologies provides vertically integrated capabilities and expertise including satellites, Earth imagery, robotics, geospatial data and analytics to help customers anticipate and address their most complex mission-critical challenges with confidence. With more than 6,500 employees in over 30 global locations, the Maxar Technologies portfolio of commercial space brands includes MDA, SSL, DigitalGlobe and Radiant Solutions. Every day, billions of people rely on Maxar to communicate, share information and data, and deliver insights that Build a Better World. Maxar trades on the Toronto Stock Exchange and New York Stock Exchange as MAXR. For more information, visit www.maxar.com .

Forward-Looking Statements
Certain statements and other information included in this release constitute "forward-looking information" or "forward-looking statements" (collectively, "forward-looking statements") under applicable securities laws. Statements including words such as "may", "will", "could", "should", "would", "plan", "potential", "intend", "anticipate", "believe", "estimate" or "expect" and other words, terms and phrases of similar meaning are often intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Forward-looking statements involve estimates, expectations, projections, goals, forecasts, assumptions, risks and uncertainties, as well as other

statements referring to or including forward-looking information included in this presentation.

Forward-looking statements are subject to various risks and uncertainties which could cause actual results to differ materially from the anticipated results or expectations expressed in this presentation. As a result, although management of the Company believes that the expectations and assumptions on which such forward-looking statements are based are reasonable, undue reliance should not be placed on the forward-looking statements because the Company can give no assurance that they will prove to be correct. The risks that could cause actual results to differ materially from current expectations include, but are not limited to, the risk factors and other disclosures about the Company and its business included in   the Company's continuous disclosure materials filed from time to time with Canadian and U.S. securities regulatory authorities, which are available online under the Company's SEDAR profile at  www.sedar.com , under the Company's EDGAR profile at  www.sec.gov  or on the Company's website at  www.maxar.com .

The forward-looking statements contained in this release are expressly qualified in their entirety by the foregoing cautionary statements. All such forward-looking statements are based upon data available as of the date of this presentation or other specified date and speak only as of such date. The Company disclaims any intention or obligation to update or revise any forward-looking statements in this presentation as a result of new information or future events, except as may be required under applicable securities legislation.

Investor Relations Contact:

Jason Gursky

Maxar VP Investor Relations

1-303-684-2207

jason.gursky@maxar.com

Media Contact:

Turner Brinton

Maxar Media Relations

1-303-684-4545

turner.brinton@maxar.com

SECOND AMENDING AGREEMENT DATED AS OF DECEMBER 21, 2018

TO THE RESTATED CREDIT AGREEMENT DATED AS OF OCTOBER 5, 2017

AMONG

MAXAR TECHNOLOGIES LTD.

as Borrower

– and –

ROYAL BANK OF CANADA

as Administrative Agent

– and –

ROYAL BANK OF CANADA

as Collateral Agent

– and –

THE LENDERS FROM TIME TO TIME PARTY THERETO

as Lenders

SECOND AMENDING AGREEMENT

THIS AGREEMENT dated as of December 21, 2018.

BETWEEN:

MAXAR TECHNOLOGIES LTD. , a corporation incorporated under the Canada Business Corporations Act and continued into the Province of British Columbia under the Business Corporations Act (British Columbia) and formerly named MacDonald, Dettwiler and Associates Ltd. (hereinafter referred to as the “ Borrower ”)

OF THE FIRST PART

‑ and -

ROYAL BANK OF CANADA, a Canadian chartered bank, in its capacity as administrative agent of the Lenders (hereinafter referred to as the “ Administrative Agent ”)

OF THE SECOND PART

‑ and -

EACH PERSON IDENTIFIED ON THE SIGNATURE PAGES HEREOF AS A “PRO RATA LENDER” (hereinafter collectively referred to as the “ Pro Rata Lenders ” and sometimes individually referred to as a “ Pro Rata Lender ”)

OF THE THIRD PART

WHEREAS the Borrower, the Agents and the Pro Rata Lenders are certain of the parties to the Credit Agreement;

AND WHEREAS, the Pro Rata Lenders named on the signature pages hereto (which collectively constitute the Required Pro Rata Lenders) have agreed to certain conditional amendments on the terms and conditions set forth herein;

NOW THEREFORE in consideration of the covenants and agreements herein contained and other good and valuable consideration, the receipt and sufficiency of which are hereby conclusively acknowledged by each of the parties hereto, the parties hereto covenant and agree as follows:

1.1         In this Agreement (including the recitals hereto), unless something in the subject matter or context is inconsistent therewith:

“ Agreement ” means this Second Amending Agreement;

“ Amendment Effective Date ” means the first date on which all of the conditions precedent set forth in Section 4.1 have been satisfied or waived by the Administrative Agent in accordance with Section 4.2;

“ Conditional Amendments ” means the amendments set forth in Section 2.1;

“ Covenant Relief Conditions ” means the conditions set forth in Section 3.1;

“ Covenant Relief Period ” means the period commencing on the Amendment Effective Date and ending on the Covenant Relief Termination Date;

“ Covenant Relief Termination Date ” means the earliest of (a) the date on which the Borrower notifies the Administrative Agent in writing that the Borrower has elected to terminate the Covenant Relief Period (which notice will be irrevocable), (b) the first date on which the Borrower or any Designated Subsidiary fails to comply with any of the Covenant Relief Conditions, and (c) the latest of (i) the Revolving Facility Maturity Date, (ii) the Operating Facility Maturity Date and (iii) the Initial Term A Maturity Date;

“ Credit Agreement ” means that certain Restated Credit Agreement dated as of October 5, 2017, among the Borrower as borrower, the Agents and the Lenders, as amended by that certain First Amending Agreement dated as of December 21, 2018, among the Borrower as borrower and the Administrative Agent;

“ Dissenting Shareholder Lawsuit ” means the appraisal action of Edenbrook Capital filed with the Court of Chancery in Delaware, pursuant to which Edenbrook Capital has claimed that, in connection with the DigitalGlobe Acquisition, the Borrower did not provide fair consideration for certain shares previously held by Edenbrook Capital in DigitalGlobe,  Inc; and

“ Legion X Program ” means DigitalGlobe’s (and its Affliates’) program for the construction of certain high-resolution earth imaging satellites, to be launched in 2021 by SpaceX’s Falcon 9 rockets.

1.2         Capitalized terms used herein without express definition shall have the same meanings herein as are ascribed thereto in the Credit Agreement.

1.3         The division of this Agreement into Sections and the insertion of headings are for convenience of reference only and shall not affect the construction or interpretation of this Agreement. The terms “this Agreement”, “hereof”, “hereunder” and similar expressions refer to this Agreement and not to any particular Section or other portion hereof and include any agreements supplemental hereto. Unless expressly indicated otherwise, all references to “Section” or “Sections” are intended to refer to a Section or Sections of the Credit Agreement.

2.1         During the Covenant Relief Period, the following amendments shall apply:

“(a)        the Consolidated Debt Leverage Ratio to exceed (i) 5.50:1.00 as at the end of each Financial Quarter ending up to and including December 31, 2018, (ii) 6.00:1.00 as at the end of each Financial Quarter ending on or after March 31, 2019 and up to and including September 30, 2020, and (iii) 5.50:1.00 as at the end of each Financial Quarter ending on or after December 31, 2020; provided that immediately following any disposition by the Borrower or its Affiliates of SS/L, each such ratio for all subsequent Financial Quarters shall be automatically reduced by 0.75:1.00; or”; and

2.2         On the Covenant Relief Termination Date, all of the Conditional Amendments shall immediately terminate and cease to have any further force or effect and at all times thereafter the Credit Agreement shall be construed as if the Conditional Amendments had never been made; provided that, for certainty, any actions or circumstances relating to the MDA Parties that occurred during the Covenant Relief Period and were expressly permitted by the Conditional Amendments shall be deemed to have occurred in compliance with the Credit Agreement notwithstanding the termination of the Conditional Amendments.

2.3         If the First Lien Debt Leverage Ratio for the Financial Quarter ending June 30, 2019 equals or exceeds 4.00: 1.00, the Borrower agrees to pay an incremental upfront fee to the Administrative Agent for the account of the consenting Pro Rata Lenders in an amount equal to 10 bps of the aggregate Commitments of such consenting Pro Rata Lenders under the Pro Rata Facilities, such fee to be payable on or before August 15, 2019.

3.1         The following are the Covenant Relief Conditions that the Borrower has agreed to voluntarily comply with during the Covenant Relief Period:

““ Asset Sale Prepayment Event ” means (x) any Asset Sale and/or (y) any disposition of assets contemplated by paragraph (j) or (to the extent outside of the ordinary course of business) (m) of the definition of “Permitted Disposition”; provided that the Borrower shall not be obligated to make any prepayment to the extent the Fair Market Value of the assets disposed of does not exceed (i) US$10 million in the case of any single disposition or series of related dispositions or (ii) US$50 million on a cumulative basis for all dispositions made after the Amendment Effective Date (excluding, in the case of this part (ii), any disposition where the Fair Market Value of the assets disposed of is less than US$1 million); provided further that to the extent the net cash proceeds of any Asset Sale or other applicable disposition are used to voluntarily prepay Term Loans pursuant to Section 2.4, the Fair Market Value of such Asset Sale or other applicable disposition shall not be counted against the foregoing limitations.”;

3.2         The Borrower shall promptly notify the Administrative Agent in writing if the Borrower or any Designated Subsidiary fails to comply with any of the Covenant Relief Conditions during the Covenant Relief Period.

4.1         This Agreement shall only become effective upon receipt by the Administrative Agent of the following:

4.2         All conditions precedent in Section 4.1 of this Agreement are solely for the benefit of the Administrative Agent and the Pro Rata Lenders, and no other Person shall have standing to require satisfaction or fulfilment of any condition precedent or that it be otherwise met and no other Person shall be deemed to be a beneficiary of any such condition, any and all of which may be freely waived in whole or in part by the Administrative Agent at any time the Administrative Agent deems it advisable to do so in its sole discretion.

5.1         On the date hereof and on the Amendment Effective Date, the Borrower represents and warrants to the Agents and the Pro Rata Lenders that all representations and warranties set forth in Article 7 of the Credit

Agreement (except those expressed to be made as of any specific date) are true and accurate in all material respects on the date hereof and on the Amendment Effective Date, as applicable; provided that any representation and warranty that is qualified as to “materiality”, “material adverse effect” or similar language shall be true and correct in all respects (after giving effect to any such qualification therein).

5.2         The representations and warranties in Section 5.1 of this Agreement shall survive the execution and delivery of this Agreement, notwithstanding any investigations or examinations which may be made by or on behalf of the Administrative Agent or the Pro Rata Lenders. Such representations and warranties shall survive until the Credit Agreement has been terminated.

The Credit Agreement and all covenants, terms and provisions thereof shall, subject to the provisions of this Agreement, be and continue to be in full force and effect.

7.1         This Agreement shall be governed by and construed in accordance with the Laws of the State of New York and the Laws of the United States of America applicable therein.

7.2         The parties hereto shall from time to time do all such further acts and things and execute and deliver all such documents as are required in order to effect the full intent of and fully perform and carry out the terms of this Agreement.

7.3         This Agreement may be executed in any number of counterparts, including by way of facsimile or PDF, each of which shall be deemed to be an original and all of which taken together shall be deemed to constitute one and the same instrument.

7.4         This Agreement shall constitute a Credit Facility Document for the purposes of the Credit Agreement.

[Remainder of page intentionally left blank]

IN WITNESS WHEREOF the parties hereto have executed this Agreement as of the date first written above.

HSBC Bank USA, N.A.

By: /s/ Frederic Fournier

Name: Frederic Fournier

Title: Senior Vice President

The Bank of Nova Scotia, Houston Branch, as Pro Rata Lender

By: /s/ Alfredo Brahim

Name: Alfredo Brahim

Title: Director

The Toronto-Dominion Bank, New York Branch, as Pro Rata Lender

By: /s/ Maria Macchiaroli

Name: Maria Macchiaroli

Title: Authorized Signatory

National Bank of Canada, as Pro Rata Lender

By: /s/ David Sellitto

Name: David Sellito

Title: Director

By: /s/ David Torrey

Name: David Torrey

Title: Managing Director

MUFG Bank, Ltd., as Pro Rata Lender

By: /s/ Dominic Yung

Name: Dominic Yung

Title: Director

Sumitomo Mitsui Banking Corporation, as Pro Rata Lender

By: /s/ Katsuyuki Kudo

Name: Katsuyuki Kudo

Title: Managing Director

ING Capital LLC, as Pro Rata Lender

By: /s/ Pim Rothweiler

Name: Pim Rothweiler

Title: Managing Director

By: /s/ Valtin Gallani

Name: Valtin Gallani

Title: Director