Exhibit 99.1

ICHOR HOLDINGS, LTD. ANNOUNCES 2016 FINANCIAL RESULTS

FREMONT, Calif., February 9, 2017—(GLOBE NEWSWIRE)—Ichor Holdings, Ltd. (NASDAQ: ICHR), a leader in the design, engineering, and manufacturing of critical fluid and gas delivery subsystems for semiconductor capital equipment, today announced financial results for the fourth quarter and year ended December 30, 2016 and guidance for the first quarter of 2017.

Highlights for the fourth quarter of 2016 and guidance for the first quarter of 2017 are as follows:

Highlights for the 2016 fiscal year are as follows:

“The fourth quarter was an exceptional finish to an exceptional year,” said Tom Rohrs, Executive Chairman and Chief Executive Officer of Ichor Holdings, Ltd (“Ichor”). “In addition to record revenue and profit we successfully completed our IPO in December 2016. Our 24% revenue growth over Q3 was driven by Ichor’s ability to deliver the right products at the right time to our key customers. For the year, our 40% revenue growth over 2015 demonstrated our ability to significantly outgrow the wafer fab equipment market.”

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U.S. GAAP Financial Results Overview

For the fourth quarter, revenue was $131.4 million, net income from continuing operations was $8.0 million, and diluted EPS was $0.04. This compares to revenue of $64.4 million, net income from continuing operations of $0.0 million, and diluted EPS of $0.00, for the fourth quarter of 2015.

For the 2016 fiscal year, revenue was $405.7 million, net income from continuing operations was $20.8 million, and diluted EPS was $0.23. This compares to revenue of $290.6 million, net income from continuing operations of $12.8 million, and diluted EPS of ($292.39), for the 2015 fiscal year.

Non-GAAP Financial Results Overview

For the fourth quarter, non-GAAP adjusted net income from continuing operations was $11.8 million and non-GAAP adjusted diluted EPS was $0.49. This compares to non-GAAP adjusted net income from continuing operations of $2.3 million and non-GAAP adjusted diluted EPS of $0.10, for the fourth quarter of 2015.

For the 2016 fiscal year, non-GAAP adjusted net income from continuing operations was $31.6 million and non-GAAP adjusted diluted EPS was $1.32. This compares to non-GAAP adjusted net income from continuing operations of $20.2 million and non-GAAP adjusted diluted EPS of $0.86, for the 2015 fiscal year.

First Quarter 2017 Financial Outlook

For the first quarter of 2017, Ichor expects revenue to be in the range of $140 million to $150 million. We expect non-GAAP adjusted diluted EPS to be in the range of $0.52 to $0.58.

This outlook for non-GAAP adjusted diluted EPS excludes known charges related to amortization of intangible assets and share-based compensation expense, but does not reflect any items that are unknown at this time, such as any additional charges related to acquisitions or other non-operational or unusual items, as well as other tax related items, which we are not able to predict without unreasonable efforts due to their inherent uncertainty.

Balance Sheet and Cash Flow Results

At December 30, 2016, Ichor had cash and restricted cash of $52.6 million, compared to cash and restricted cash of $24.2 million at December 25, 2015. The increase in cash reduction in long-term debt is primarily due to net proceeds from our initial public offering completed in December 2016 (our “IPO”) of $47.1 million, cash flows from operating activities of $27.7 million, partially offset by net payments of debt of $25.2 million, cash paid for the acquisition of Ajax-United Patterns & Molds, Inc. (“Ajax”) of $17.4 million in April 2016, and capital expenditures of $4.3 million.

Ichor uses a 52- or 53-week fiscal year ending on the last Friday of December. The 2016 fiscal year was a 53 week year, and the 2015 fiscal year was a 52 week year. The fourth quarter of the 2016 fiscal year was a 14 week quarter, and the fourth quarter of the 2015 fiscal year was a 13 week quarter.

Use of Non-GAAP Financial Results

In addition to U.S. GAAP results, this press release also contains non-GAAP financial results, including non-GAAP adjusted net income from continuing operations and non-GAAP adjusted diluted EPS. Non-GAAP adjusted net income from continuing operations is defined as: net income from continuing operations; excluding amortization of intangible assets, share-based compensation expense, and other non-recurring expenses; tax adjustments related to those non-GAAP adjustments; and the tax benefit associated with the acquisition of Ajax. Non-GAAP adjusted diluted EPS is defined as non-GAAP adjusted net income from continuing operations divided by adjusted diluted ordinary shares, which assumes the IPO and conversion of preferred shares into ordinary shares occurred at the beginning of the measurement period.

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Management uses non-GAAP adjusted net income from continuing operations, and non-GAAP adjusted diluted EPS to evaluate the Ichor’s operating and financial results. Ichor believes the presentation of non-GAAP results is useful to investors for analyzing business trends and comparing performance to prior periods, along with enhancing investors’ ability to view Ichor’s results from management’s perspective. A table presenting the reconciliation of non-GAAP results to U.S. GAAP results is included at the end of this press release.

Conference Call

Ichor will conduct a conference call to discuss its fourth quarter and full year 2016 results and business outlook on February 9th, 2017 at 2:00 p.m. Pacific time.

To listen to the conference call via the Internet, please visit the investor relations section of Ichor’s Web site at ir.ichorsystems.com. To listen to the conference call via telephone, please call 844-395-9251 (domestic) or 478-219-0504 (international), conference ID: 49760370.

A taped replay of the webcast will be available shortly after the call on Ichor’s website or by calling 855-859-2056 (domestic) or 404-537-3406 (international), conference ID: 49760370.

About Ichor

Ichor is a leader in the design, engineering and manufacturing of critical fluid delivery subsystems for semiconductor capital equipment. Our primary offerings include gas and chemical delivery subsystems, collectively known as fluid delivery subsystems, which are key elements of the process tools used in the manufacturing of semiconductor devices. Our gas delivery subsystems deliver, monitor and control precise quantities of the specialized gases used in semiconductor manufacturing processes such as etch and deposition. Our chemical delivery subsystems precisely blend and dispense the reactive liquid chemistries used in semiconductor manufacturing processes such as electroplating and cleaning. We also manufacture certain components for internal use in fluid delivery systems and for direct sales to our customers. This vertically integrated portion of our business is primarily focused on metal and plastic parts that are used in gas and chemical systems, respectively. For more information, please visit Ichor’s website at: www.ichorsystems.com.

Safe Harbor Statement

Certain statements in this release are “forward-looking statements” made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Words such as “guidance,” “expects,” “intends,” “projects,” “plans,” “believes,” “estimates,” “targets,” “anticipates,” and similar expressions are used to identify these forward-looking statements. Examples of forward-looking statements include, but are not limited to, statements regarding expected revenue and non-GAAP adjusted diluted EPS, as well as any other statement that does not directly relate to any historical or current fact. Forward-looking statements are based on current expectations and assumptions, which may not prove to be accurate. These statements are not guarantees and are subject to risks, uncertainties and changes in circumstances that are difficult to predict. Many factors could cause actual results to differ materially and adversely from these forward-looking statements, including: (1) dependence on expenditures by manufacturers and cyclical downturns in the semiconductor capital equipment industry, (2) reliance on a very small number of original equipment manufacturers for a significant portion of sales, (3) negotiating leverage held by our customers, (4) competitiveness and rapid evolution of the industries in which we participate, (5) risks associated with weakness in the global economy and geopolitical instability, (6) keeping pace with developments in the industries we serve and with technological innovation generally, (7) designing, developing and introducing new products that are accepted by original equipment manufacturers in order to retain our existing customers and obtain new customers, (8) managing our manufacturing and procurement process effectively, (9) defects in our products that could damage our reputation, decrease market acceptance and result in potentially costly litigation, and (10) dependence on a limited number of suppliers. Additional information concerning these and other factors can be found in Ichor’s filings with

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the Securities and Exchange Commission, including other risks, relevant factors and uncertainties identified in the “Risk Factors” section of Ichor’s Rule 424(b)(4) prospectus filed with the Securities and Exchange Commission on December 12, 2016. We undertake no obligation to update publicly or revise any forward-looking statements contained herein to reflect future events or developments, except as required by law

Contact:

Maurice Carson, 510-897-5200

IR@ichorsystems.com

Source: Ichor Holdings, Ltd.

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The following table calculates diluted EPS from continuing operations attributable to ordinary shareholders using the two class method, as Ichor had two classes of stock during 2016 and 2015. Beginning in the first quarter of 2017, Ichor no longer uses the two class method, as there is only one class of stock outstanding subsequent to our December IPO. All preferred shares were converted into ordinary shares in connection with our December IPO.

Under the two-class method, net income attributable to ordinary shareholders after deduction of preferred share dividends, if any, is determined by allocating undistributed earnings between ordinary shares and the participating securities based on their respective rights to receive dividends. In computing diluted net income attributable to ordinary shareholders, undistributed earnings are re-allocated to reflect the potential impact of dilutive securities. Basic net income per share attributable to ordinary shareholders is computed by dividing net income attributable to ordinary shareholders by the weighted-average number of ordinary shares outstanding during the period. All participating securities are excluded from basic weighted-average ordinary shares outstanding. Diluted net income per share attributable to ordinary shareholders is computed by dividing net income attributable to ordinary shareholders by the weighted average number of ordinary shares outstanding, including all potentially dilutive ordinary shares, if the effect of each class of potential ordinary shares is dilutive.

For purposes of two-class method EPS determination, an accounting policy election has been made to treat each income statement line item (e.g. net income from continuing operations, net loss from discontinued operations, and net income (loss) ) as an independent calculation and only allocate earnings to participating securities for those line items for which income is reported, as the participating securities do not have a contractual obligation to participate in losses. There is therefore no allocation of losses to participating securities for those line items for which a loss is reported. Under this method, the sum of the individual EPS income statement line items will not reconcile to the total net income per share.

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