Exhibit 99.1

Nanometrics Reports Fourth Quarter and Full Year 2017 Financial Results

Record Revenues for Both the Fourth Quarter and the Full Year

MILPITAS, Calif., February 6, 2018 — Nanometrics Incorporated (NASDAQ: NANO), a leading provider of advanced process control systems, today announced financial results for its fourth quarter and full year ended December 30, 2017.

Fourth Quarter 2017 Highlights:

A reconciliation between GAAP operating results and non-GAAP operating results is provided following the financial statements that are part of this release and on the investor page of Nanometrics' website. Non-GAAP results exclude the impact of amortization of acquired intangibles, severance costs, executive search costs and certain discrete tax items.

“I am pleased to announce strong financial results for the fourth quarter of 2017,” commented Dr. Pierre-Yves Lesaicherre, president and chief executive officer of Nanometrics. “As expected, the revenues delayed from the third quarter were all recognized in the fourth quarter. We experienced some modest upside in high-margin upgrade sales, and also recognized revenue on an evaluation system that had been fully depreciated, which led to gross margins exceeding our guidance, and above normalized levels at these revenue volumes. For the full year, 2017 set new records for the company, and was the fourth straight year of double-digit revenue growth and, importantly, was the fourth straight year of increasing gross and operating margins.

“As we look to a continued positive business environment for 2018, which is expected to witness strong spending from the memory market, our first quarter is expected to be at a similar revenue level to the fourth quarter (after adjusting for the revenue delay), with

positive momentum currently indicated for the second quarter. With our current visibility, we expect the first half of 2018 will be significantly stronger than the second half of 2017, as well as the year-ago period. Based on current activity with our leading customers, we also believe 2018 will be a fifth straight year of double-digit revenue growth and expanding gross and operating margins.” Dr. Lesaicherre concluded, “I am very excited to have joined the company in this period of growth and new product development, and look forward to investing in new technologies, delivering on our R&D investments, and introducing new products to drive continued growth and outperformance in the years to come.”

Fourth Quarter 2017 Summary

Revenues for the fourth quarter of 2017 were $78.2 million, up 38% from $56.7 million in the third quarter of 2017, and up 32% from $59.2 million in the fourth quarter of 2016. On a GAAP basis, gross margin was 56.2%, compared to 54.1% in the prior quarter and 52.1% in the year-ago period. Operating income was $19.2 million, compared to $7.5 million in the prior quarter and $9.0 million in the year-ago period. Net income was $10.8 million or $0.42 per diluted share, compared to $5.8 million or $0.22 per diluted share in the prior quarter and $26.7 million or $1.04 per diluted share in the fourth quarter of 2016. Fourth quarter of 2016 included a favorable impact of the change of valuation allowance on certain deferred tax assets.

On a non-GAAP basis, which excludes amortization of acquired intangible assets and severance costs, gross margin was 56.4%, compared to 54.4% in the prior quarter and 52.3% in the year-ago period. Non-GAAP operating income was $19.8 million, compared to $7.9 million in the prior quarter and $9.1 million in the fourth quarter of 2016. Non-GAAP net income, which also adjusts for certain discrete tax items, was $13.6 million or $0.53 per diluted share, compared to $5.7 million or $0.22 per diluted share in the prior quarter and $8.4 million or $0.33 per diluted share in the fourth quarter of 2016.

Full Year 2017 Summary

Revenues were $258.6 million, up 17% from $221.1 million in 2016.  On a GAAP basis, gross margin was 52.9%, compared to 51.6% in 2016, and operating income was $42.8 million, compared to $29.1 million in 2016.  Net income was $30.2 million or $1.17 per diluted share, compared to $44.0 million or $1.75 per diluted share in 2016.

On a non-GAAP basis, which excludes amortization of acquired intangible assets and severance costs, gross margin was 53.1% compared to 52.3% in 2016.  Non-GAAP operating income, which also excludes executive search costs and severance costs in 2017, was $44.6 million, compared to $30.6 million in 2016. Non-GAAP net income, which also adjusts for certain discrete tax items was $31.8 million or $1.23 per diluted share, compared to $27.1 million or $1.08 per diluted share in 2016 which excludes the impact of the change of valuation allowance on deferred tax assets of $18.4 million.

Business Outlook

Management expects first-quarter 2018 revenues in the range of $69 to $75 million. Gross margin is expected to be approximately 55%, plus or minus 1%, on both a GAAP and non-GAAP basis. Management expects first-quarter operating expenses to range between $24.5 million and $25.5 million on both a GAAP and non-GAAP basis, and earnings in the range of $0.38 to $0.50 per diluted share on both a GAAP and non-GAAP basis. The company’s EPS guidance assumes an improved tax rate of approximately 25%, compared to prior expectations of 30%, and weighted average shares outstanding of approximately 25 million.

Conference Call Details

A conference call to discuss fourth quarter 2017 results will be held today at 4:30 p.m. EST (1:30 p.m. PST). To participate in the conference call, the dial-in numbers are (877) 374-4041 for domestic callers and (253) 237-1156 for international callers. The conference ID is 5497447. A live and recorded webcast and supplemental financial information will be made available on the investor page of the Nanometrics website at www.nanometrics.com.

Use of Non-GAAP Financial Information

The non-GAAP gross profit, gross margin, operating income, operating income margin, net income, net income per share, which exclude certain expenses, charges and special items, and free cash flow, were not prepared in accordance with U.S. Generally Accepted Accounting Principles (GAAP). Management uses non-GAAP financial results, which exclude amortization of acquired intangibles assets, severance costs, executive search costs and certain discrete tax items, to evaluate the company’s ongoing performance and to enable comparison to other periods that did not include these items. The company believes the presentation of non-GAAP results is useful to investors for analyzing ongoing business trends, comparing performance to prior periods, and enhancing the investor’s ability to view the company’s results from management’s perspective; however, investors are cautioned that other companies may calculate these measures differently than Nanometrics does, which would limit the usefulness of these financial measures. A table presenting a reconciliation of GAAP results to non-GAAP results is included at the end of this press release and is available on the investor page of the Nanometrics website at www.nanometrics.com.

About Nanometrics

Nanometrics is a leading provider of advanced, high-performance process control metrology and inspection systems used primarily in the fabrication of semiconductors and other solid-state devices, including sensors, optoelectronic devices, high-brightness LEDs, discretes and data storage components. Nanometrics’ automated and integrated metrology systems measure critical dimensions, device structures, topography and various thin film properties, including three-dimensional features and film thickness, as well as optical, electrical and material properties. The company’s process control solutions are deployed throughout the fabrication process, from front-end-of-line substrate manufacturing, to high-volume production of semiconductors and other devices, to advanced three-dimensional

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wafer-level packaging applications. Nanometrics’ systems enable advanced process control for device manufacturers, providing improved device yield at reduced manufacturing cycle time, supporting the accelerated product life cycles in the semiconductor and other advanced device markets. The company maintains its headquarters in Milpitas, California, with sales and service offices worldwide. Nanometrics is traded on NASDAQ Global Select Market under the symbol NANO. Nanometrics’ website is http://www.nanometrics.com.

Forward Looking Statements

Certain statements in this press release, including those found in Dr. Lesaicherre’s quote regarding expected future financial performance, and under the caption “Business Outlook,” are forward-looking statements that involve a number of risks and uncertainties that could cause actual results to differ materially from those described in this release. Although Nanometrics believes that the expectations reflected in the forward-looking statements are reasonable, actual results could differ materially from these expectations due to a variety of factors, including, but not limited to: decreased levels of industry spending; slowing adoption rate of Nanometrics’ new products; Nanometrics’ inability to gain additional market share, increase sales, ship products as scheduled, achieve customer acceptance of new products, or outperform the industry; decreased demand for Nanometrics’ products; shifts in the timing of customer orders and product shipments; technology adoption rates; changes in customer and product mix; changes in market share; changes in operating expenses; and general economic conditions. For additional information and considerations regarding the risks faced by Nanometrics that could cause actual results to differ materially, see its annual report on Form 10-K for the year ended December 31, 2016, as filed with the Securities and Exchange Commission on March 3, 2017 including under the caption “Risk Factors,” as well as other periodic reports filed with the SEC from time to time. Nanometrics disclaims any obligation to update information contained in any forward-looking statement, except as required by law.

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NANOMETRICS INCORPORATED

CONDENSED CONSOLIDATED BALANCE SHEETS

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(Unaudited)

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NANOMETRICS INCORPORATED

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands except per share amounts)

(Unaudited)

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NANOMETRICS INCORPORATED

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

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(Unaudited)

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NANOMETRICS INCORPORATED

RECONCILIATION OF GAAP TO NON-GAAP RESULTS

(In thousands, except per share amounts)

(Unaudited)

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NANOMETRICS INCORPORATED

RECONCILIATION OF GAAP TO NON-GAAP RESULTS – (Continued)

(In thousands, except per share amounts)

(Unaudited)

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