ASM INTERNATIONAL N.V. REPORTS SECOND QUARTER 2017 RESULTS

Almere, The Netherlands

July 25, 2017

ASM International N.V. (Euronext Amsterdam: ASM) today reports its second quarter 2017 operating results (unaudited) in accordance with IFRS.

FINANCIAL HIGHLIGHTS

ASMI results based on IFRS.

? New orders at ?,?206 million were 1% above the Q1 2017 level and 29% above last year's Q2 level.

? Net sales for the second quarter 2017 were ?,?202 million, an increase of 40% compared to the previous quarter. Year-on-year net sales increased with 46%.

? Net earnings of ?,?132 million in the second quarter included a result of ?,?84 million from the 5% sale and dilution of the ASMPT stake.

? Normalized net earnings for the second quarter 2017 increased by ?,?14 million compared to the first quarter 2017. Operating result increased to ?,?38 million. The financing result included ?,?11 million negative effects from currencies compared to ?,?7 million negative effects in the first quarter. The result from investments decreased with ?,?4 million due to the dilution of our stake in ASMPT. Moreover the ASMPT results in the first quarter included a one-off non-cash gain of ?,?10 million related to the revaluation of the convertible bond.

COMMENT

Commenting on the results, Chuck del Prado, President and Chief Executive Officer of ASM International said: "In Q2 we realized sales of ?,?202 million, which was slightly above our guidance and at a historical high quarterly level. The order intake for Q2, at ?,?206 million, came in at the high end of the forecast and was also at the highest level in the company's history. Order intake in ALD was primarily strong from the 3D-NAND and Foundry segments. We also received several Intrepid Epitaxy orders in Q2."

OUTLOOK

Based on our current assessment, we continue to expect a clear year-on-year improvement in the single wafer ALD market in 2017, with demand in the Logic/Foundry segment remaining healthy and a strong increase in the 3D-NAND segment.

For Q3 we expect a sales level of ?,?170-190 million, on a currency comparable level, while for the second half of 2017 as a whole we expect a sales level higher than in the first half of 2017. After the very strong orders in the past two quarters we expect order intake in Q3 at a still healthy level of ?,?150-170 million, on a currency comparable level.

SHARE BUYBACK PROGRAM

On May 25, 2016, the Annual General Meeting of Shareholders authorized ASMI to acquire up to a maximum of 10% of its shares for a period of 18 months. On October 26, 2016, ASMI announced a share buyback program for the repurchase of up to ?,?50 million of the Company's common shares within the 2016-2017 time frame. On March 2, 2017, ASMI announced that its Management Board authorized an increase in this program to ?,?100 million. The 2016-2017 program started on December 13, 2016 and is part of ASMI's commitment to use excess cash for the benefit of its shareholders. On June 30, 2017, 77.7% of the program was completed at an average share price of ?,?49.93.

On April 24, 2017, ASMI announced a partial sale of its ASMPT stake, whereby ASMI indicated to use the proceeds of approximately ?,?245 million for a new share buyback program. The program will start as soon as the current program has been completed. During the Annual General Meeting of Shareholders of May 22, 2017 the Board was again authorized to acquire up to 10% of ASMI shares for a period of 18 months. During the same meeting it was approved to cancel 1.5 million treasury shares.This is expected to become effective as of July 29, 2017. In this respect it is noted that the company held 4.82 million treasury shares as per June 30, 2017, which is more than sufficient to cover the outstanding options and restricted/performance shares.

About ASM International

ASM International NV, headquartered in Almere, the Netherlands, its subsidiaries and participations design and manufacture equipment and materials used to produce semiconductor devices. ASM International, its subsidiaries and participations provide production solutions for wafer processing (Front-end segment) as well as for assembly & packaging and surface mount technology (Back-end segment) through facilities in the United States, Europe, Japan and Asia. ASM International's common stock trades on the Euronext Amsterdam Stock Exchange (symbol ASM). For more information, visit ASMI's website at www.asm.com.

Cautionary Note Regarding Forward-Looking Statements: All matters discussed in this press release, except for any historical data, are forward-looking statements. Forward-looking statements involve risks and uncertainties that could cause actual results to differ materially from those in the forward-looking statements. These include, but are not limited to, economic conditions and trends in the semiconductor industry generally and the timing of the industry cycles specifically, currency fluctuations, corporate transactions, financing and liquidity matters, the success of restructurings, the timing of significant orders, market acceptance of new products, competitive factors, litigation involving intellectual property, shareholders or other issues, commercial and economic disruption due to natural disasters, terrorist activity, armed conflict or political instability, epidemics and other risks indicated in the Company's reports and financial statements. The Company assumes no obligation nor intends to update or revise any forward-looking statements to reflect future developments or circumstances.

ASM International will host an investor conference call and web cast on Wednesday, July 26, 2017 at 15:00 Continental European Time (9:00 a.m. - US Eastern Time).

The teleconference dial-in numbers are as follows:

? United States: +1 646 254 3363

? International: +44 (0)20 7136 6283

? The Netherlands: +31 (0)20 716 8296

? Access Code: 1119350

A simultaneous audio webcast and replay will be accessible at www.asm.com.

CONTACT

Investor contact:

Victor Bare??o

T: +31 88 100 8500

E: victor.bareno@asm.com

Media contact:

Ian Bickerton

T: +31 625 018 512

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