DGAP-Stimmrechtsanteile: ROFIN-SINAR Technologies Inc.

DGAP-PVR: ROFIN-SINAR Technologies Inc.: Release according to Article 26, Section 1 of the WpHG [the German Securities Trading Act] with the objective of Europe-wide distribution

Rofin-Sinar Technologies Inc.

24.02.2016 19:16

Dissemination of a Voting Rights Announcement, transmitted by DGAP - a service of EQS Group AG. The issuer is solely responsible for the content of this announcement. ---------------------------------------------------------------------------

Notification of Major Holdings

1. Details of issuer

Rofin-Sinar Technologies Inc. 40984 Concept Drive MI 48170 Plymouth United States

2. Reason for notification

Acquisition/disposal of shares with voting rights Acquisition/disposal of instruments Change of breakdown of voting rights X Other reason: Voluntary group notification with triggered threshold on subsidiary level

3. Details of person subject to the notification obligation

Name: City and country of registered office: National Rural Electric Arlington, Virginia United States Cooperative Association of America (USA)

4. Names of shareholder(s) holding directly 3% or more voting rights, if different from 3.

Homestead Funds, Inc.

5. Date on which threshold was crossed or reached

01 Jan 2016

6. Total positions

% of voting % of voting rights total of total number rights attached through instruments both in % of voting to shares (total (total of 7.b.1 + (7.a. + rights of of 7.a.) 7.b.2) 7.b.) issuer Result- 5.47 % % 5.47 % 33,379,287 ing situat- ion Previo- 5.10 % % % / us notifi- cation

7. Notified details of the resulting situation a. Voting rights attached to shares (Sec.s 21, 22 WpHG)

ISIN absolute in % direct indirect direct indirect (Sec. 21 WpHG) (Sec. 22 WpHG) (Sec. 21 WpHG) (Sec. 22 WpHG) US7750431022 1,826,692 % 5.47 % Total 1,826,692 5.47 %

b.1. Instruments according to Sec. 25 para. 1 No. 1 WpHG

Type of Expiration or Exercise or Voting Voting instrument maturity date conversion rights rights in period absolute % % Total %

b.2. Instruments according to Sec. 25 para. 1 No. 2 WpHG

Type of Expiration Exercise or Cash or Voting Voting instrume- or maturity conversion physical rights rights nt date period settlement absolute in % % Total %

8. Information in relation to the person subject to the notification obligation

Person subject to the notification obligation is not controlled and does itself not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer (1.). X Full chain of controlled undertakings starting with the ultimate controlling natural person or legal entity:

Name % of voting % of voting rights Total of both rights (if at through instruments (if at least least held 3% (if at least held 5% held 5% or or more) or more) more) National Rural % % % Electric Cooperative Association NRECA United Inc. % % % RE Investment % % % Corporation RE Advisors % % % Corporation Homestead Funds, 3.63 % % % Inc. (a fund managed by RE Advisors Corporation)

9. In case of proxy voting according to Sec. 22 para. 3 WpHG

Date of general meeting: Holding position after general meeting: % (equals voting rights)

24.02.2016 The DGAP Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases. Media archive at www.dgap-medientreff.de and www.dgap.de

--------------------------------------------------------------------------- Language: English Company: Rofin-Sinar Technologies Inc. 40984 Concept Drive MI 48170 Plymouth United States Internet: www.rofin.com End of Announcement DGAP News-Service ---------------------------------------------------------------------------