EX-99.(a)(1)(vi)

This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below). The Offer (as defined below) is made solely by the Offer to Purchase (as defined below) and the related Letter of Transmittal (as defined below) and any amendments or supplements thereto. The Offer is not being made to (and no tenders will be accepted from or on behalf of) holders of Shares in any jurisdiction in which the making of the Offer or the acceptance thereof would not be in compliance with the securities, “blue sky” or other laws of such jurisdiction. Purchaser (as defined below) may, in its discretion, take such action as it deems necessary to make the Offer to holders of Shares in any such jurisdiction in compliance with such applicable laws. In those jurisdictions where applicable laws require the Offer to be made by a licensed broker or dealer, the Offer will be deemed to be made on behalf of Purchaser by one or more registered brokers or dealers licensed under the laws of such jurisdiction to be designated by Purchaser.

Clearwater Merger Sub, Inc., a Delaware corporation (“Purchaser”) and a wholly owned subsidiary of Philips Holding USA Inc., a Delaware corporation (“Parent”) and a wholly owned subsidiary of Koninklijke Philips N.V., a corporation organized under the laws of The Netherlands (“Royal Philips”), is offering to purchase all of the shares of common stock, par value $0.001 per share, including any associated rights to purchase capital stock (such rights, together with such shares of common stock, the “Shares”), of Volcano Corporation, a Delaware corporation (“Volcano”), that are issued and outstanding at a price of $18.00 per Share, net to the seller in cash (the “Offer Price”), without interest, less any applicable withholding taxes, upon the terms and subject to the conditions set forth in the offer to purchase, dated December 30, 2014 (as it may be amended or supplemented from time to time, the “Offer to Purchase”), and in the related letter of transmittal (as it may be amended or supplemented from time to time, the “Letter of Transmittal” and, together with the Offer to Purchase, the “Offer”). Tendering stockholders who have Shares registered in their names and who tender directly to American Stock Transfer & Trust Company, LLC (the “Depositary”) will not be obligated to pay brokerage fees, commissions or, except as set forth in the Letter of Transmittal, stock transfer taxes on the sale of Shares to Purchaser pursuant to the Offer. Stockholders with Shares held in street name by a broker, dealer, commercial bank, trust company or other nominee should consult with their nominee to determine if they will be charged any service fees or commissions.

THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, EASTERN TIME, ON JANUARY 29, 2015 (ONE MINUTE AFTER 11:59 P.M., EASTERN TIME, ON JANUARY 28, 2015) UNLESS THE OFFER IS EXTENDED.

The Offer is being made pursuant to the Agreement and Plan of Merger, dated as of December 16, 2014, by and among Parent, Purchaser and Volcano (as it may be amended or supplemented from time to time in accordance with its terms, the “Merger Agreement”), pursuant to which, immediately following the time Purchaser accepts, for the first time, for payment Shares validly tendered and not properly withdrawn pursuant to the Offer (the “Offer Acceptance Time”) and subject to the satisfaction or waiver of the remaining conditions set forth in the Merger Agreement, Purchaser will merge with and into Volcano (the “Merger”), with Volcano continuing as the surviving corporation in the Merger and as a wholly owned subsidiary of Parent. Because the Merger will be governed by Section 251(h) of the General Corporation Law of the State of Delaware (“DGCL”), no stockholder vote will be required to consummate the Merger. At the effective time of the Merger, each Share then outstanding (other than Shares that are held by any stockholders who properly demand appraisal in connection with the Merger as described in the Offer to Purchase) will be converted into the right to receive the Offer Price, without interest, less any applicable withholding taxes, except for Shares then owned by Parent, Purchaser or any other wholly owned subsidiary of Parent, and Shares held by Volcano or by any of its wholly owned subsidiaries, which Shares will be cancelled and retired and will cease to exist, and no consideration will be delivered in exchange therefor. As a result of the Merger, the Shares will cease to be publicly traded and Volcano will become directly wholly owned by Parent. The Merger Agreement is more fully described in the Offer to Purchase.

The Offer is not subject to any financing condition. The Offer is conditioned upon: (i) there being validly tendered (not including any Shares tendered pursuant to guaranteed delivery procedures that were not actually delivered prior to 12:00 midnight, Eastern time, on January 29, 2015 (one minute after 11:59 P.M., Eastern time, on January 28, 2015) (the “Expiration Date,” unless Purchaser extends the Offer pursuant to and in accordance with the terms of the Merger Agreement, in which event “Expiration Date” will mean the latest time and date at which the Offer, as so extended by Purchaser, will expire)) and not validly withdrawn prior to the Expiration Date Shares that, considered together with all other Shares (if any) beneficially owned by Parent and its subsidiaries immediately prior to the Offer Acceptance Time, represent one Share more than 50% of the sum of (A) the total number of Shares outstanding at the time of the expiration of the Offer and (B) the aggregate number of Shares that Volcano may be required to issue upon conversion, settlement or exercise of all then outstanding options, benefit plans, obligations or securities convertible or exchangeable into Shares, or other rights to acquire or be issued Shares (including all then outstanding options granted or outstanding under Volcano’s equity plans, warrants to purchase Shares and convertible notes issued by Volcano), for which Volcano has received notices of exercise or conversion prior to the expiration of the Offer (and as to which Shares have not yet been issued) (the “Minimum Condition”); (ii) receipt of any consent, approval or clearance with respect to, or terminations or expiration of any applicable mandatory waiting period (and any extensions thereof) imposed under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the regulations thereunder (the “HSR Act”) and approvals under applicable foreign antitrust, competition or fair trade laws in certain jurisdictions set forth in the Merger Agreement (the “Antitrust Condition”); and (iii) other customary conditions as described in Section 15 of the Offer to Purchase.

THE BOARD OF DIRECTORS OF VOLCANO UNANIMOUSLY RECOMMENDS THAT YOU

TENDER ALL OF YOUR SHARES PURSUANT TO THE OFFER.

After careful consideration, the board of directors of Volcano (the “Volcano Board”) has unanimously (i) determined that the Merger Agreement and the transactions contemplated thereby, including the Offer and the Merger, are advisable to, and in the best interest of, Volcano and its stockholders; (ii) agreed that the Merger will be subject to Section 251(h) of the DGCL; (iii) approved the execution, delivery and performance by Volcano of the Merger Agreement and the consummation of the transactions contemplated thereby, including the Offer and the Merger; and (iv) resolved to recommend that the stockholders of Volcano tender their Shares to Purchaser pursuant to the Offer.

The Offer to Purchase, the Letter of Transmittal and Volcano’s Solicitation/Recommendation Statement on Schedule 14D-9 (which contains the recommendation of the Volcano Board and the reasons therefor) contain important information. Stockholders should carefully read these documents in their entirety before making a decision with respect to the Offer.

Purchaser and Parent may waive any condition, in whole or in part, other than the Minimum Condition, at any time and from time to time, without Volcano’s consent. If the conditions of the Offer have not been satisfied or waived and the Merger Agreement has not been terminated, Purchaser may extend the Offer on one or more occasions, for an additional period of up to ten business days per extension, until all conditions of the Offer have been satisfied or waived. If the conditions of the Offer have not been satisfied or waived and the Merger Agreement has not been terminated, Volcano may require Purchaser to extend the Offer on one or more occasions, for an additional period of up to ten business days per extension, until all conditions of the Offer have been satisfied or waived. In addition, Purchaser will extend the Offer either (i) for the minimum period required by any legal requirement, interpretation or position of the Securities and Exchange Commission or its staff or NASDAQ or its staff or (ii) for periods of up to ten business days per extension until any waiting period (and any extension thereof) applicable to the consummation of the Offer under the HSR Act and any foreign antitrust or competition-related legal requirement has expired or been terminated. However, in no event will Purchaser be required to extend the Offer beyond the Extension Deadline, which is the earliest to occur of (x) the valid termination of the Merger Agreement and (y) June 16, 2015.

Any extension, delay, termination, waiver or amendment of the Offer will be followed as promptly as practicable by public announcement thereof, such announcement in the case of an extension to be made no later than 9:00 A.M., Eastern time, on the next business day after the previously scheduled Expiration Date.

There will not be a subsequent offering period for the Offer. Pursuant to the Merger Agreement, subject to the satisfaction of the Minimum Condition and the satisfaction or waiver of the remaining conditions set forth in the Merger Agreement, Purchaser, Parent and Volcano will take all necessary and appropriate action to cause the Merger to become effective immediately following the Offer Acceptance Time. Because the Merger will be governed by Section 251(h) of the DGCL, no stockholder vote will be required to consummate the Merger. Subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Purchaser, Parent and Volcano have agreed to cause the Merger to become effective immediately following the Offer Acceptance Time. Purchaser does not expect there to be a significant period of time between the consummation of the Offer and the consummation of the Merger.

Upon the terms and subject to the conditions of the Offer (including, if the Offer is extended or amended, the terms and conditions of any such extension or amendment), as soon as practicable after the Expiration Date (but no later than 9:00 A.M., Eastern Time, on the first business day after the Expiration Date), Purchaser shall (and Parent shall cause Purchaser to) accept for payment and promptly thereafter (but no later than the first business day after the Expiration Date) pay for all Shares validly tendered and not properly withdrawn prior to the Expiration Date pursuant to the Offer. For purposes of the Offer, Purchaser will be deemed to have accepted for payment, and thereby purchased, Shares validly tendered and not properly withdrawn, if and when Purchaser gives oral or written notice to the Depositary of Purchaser’s acceptance for payment of such Shares pursuant to the Offer. Upon the terms and subject to the conditions of the Offer, payment for Shares accepted for payment pursuant to the Offer will be made by deposit of the Offer Price therefor with the Depositary, which will act as agent for tendering stockholders of record for the purpose of receiving payments from Purchaser and transmitting such payments to tendering stockholders whose Shares have been accepted for payment. Under no circumstances will interest be paid with respect to the purchase of Shares pursuant to the Offer, regardless of any extension of the Offer or delay in making payment for Shares.

No alternative, conditional or contingent tenders will be accepted. In all cases, payment for Shares accepted for payment pursuant to the Offer will be made only after timely receipt by the Depositary of: (i) for Shares held as physical certificates, the certificates evidencing such Shares (the “Share Certificates”) or, for Shares held in book-entry form, confirmation of a book-entry transfer of such Shares into the Depositary’s account at The Depository Trust Company (“DTC”), pursuant to the procedures set forth in the Offer to Purchase, (ii) a properly completed and duly executed Letter of Transmittal, together with any required signature guarantees or, in the case of book-entry transfers of Shares, either such Letter of Transmittal or an Agent’s Message (as defined in the Offer to Purchase) in lieu of such Letter of Transmittal, and (iii) any other documents required by the Letter of Transmittal.

Shares tendered pursuant to the Offer may be withdrawn at any time prior to the Expiration Date. Thereafter, tenders of Shares are irrevocable, except that they may also be withdrawn after 60 days from the commencement of the Offer, unless such Shares have already been accepted for payment by Purchaser pursuant to the Offer. For a withdrawal to be proper and effective, a written notice of withdrawal must be timely received by the Depositary at one of its addresses set forth on the back cover of the Offer to Purchase. Any such notice of withdrawal must specify the name of the person who tendered the Shares to be withdrawn, the number of Shares to be withdrawn and the name of the registered holder of such Shares, if different from that of the person who tendered such Shares. If Share Certificates evidencing Shares to be withdrawn have been delivered or otherwise identified to the Depositary, then, prior to the physical release of such Share Certificates, the serial numbers shown on such Share Certificates must be submitted to the Depositary and the signature(s) on the notice of withdrawal must be guaranteed by an Eligible Institution (as defined in the Offer to Purchase), unless such Shares have been tendered for the account of an Eligible Institution. If Shares have been tendered pursuant to the procedure for book-entry transfer as set forth in the Offer to Purchase, any notice of withdrawal must also specify the name and number of the account at DTC to be credited with the withdrawn Shares. Withdrawals of tendered Shares may not be rescinded, and any Shares properly withdrawn will thereafter be deemed not to have been validly tendered for purposes of the Offer. However, Shares that have been properly withdrawn may be re-tendered at any time prior to the Expiration Date by following one of the procedures described in the Offer to Purchase.

All questions as to the validity, form, eligibility (including time of receipt) and acceptance for payment of any tender of Shares will be determined by Purchaser in its sole discretion.

Purchaser reserves the absolute right to reject any and all tenders determined by it not to be in proper form or the acceptance for payment of which may, in the opinion of its counsel, be unlawful. None of Purchaser, the Depositary, the Information Agent (as defined below) or any other person will be under any duty to give notification of any defects or irregularities in any tenders or in any notice of withdrawal or incur any liability for failure to give any such notification.

Volcano has provided Purchaser with Volcano’s stockholder list and security position listings for the purpose of disseminating the Offer to holders of Shares. The Offer to Purchase and the Letter of Transmittal will be mailed to record holders of Shares whose names appear on Volcano’s stockholder list and will be furnished, for subsequent transmittal to beneficial owners of Shares, to brokers, dealers, commercial banks, trust companies and other nominees whose names, or the names of whose nominees, appear on the stockholder list or, if applicable, who are listed as participants in a clearing agency’s security position listing.

The receipt of cash for Shares pursuant to the Offer or the Merger will be a taxable transaction for U.S. federal income tax purposes. In general, a United States Holder (as defined in the Offer to Purchase) of Shares will recognize gain or loss in an amount equal to the difference between such United States Holder’s adjusted federal income tax basis in such Shares sold pursuant to the Offer or converted into the right to receive cash in the Merger and the amount of cash received therefor. For a more detailed description of certain U.S. federal income tax consequences of the Offer and the Merger, see the Offer to Purchase. Each holder of Shares should consult its tax advisor about the particular tax consequences to such holder of tendering Shares pursuant to the Offer, exchanging Shares in the Merger or exercising appraisal rights.

The information required to be disclosed by Rule 14d-6(d)(1) under the Securities Exchange Act of 1934, as amended, is contained in the Offer to Purchase and is incorporated herein by reference.

Questions and requests for assistance may be directed to Georgeson Inc., the information agent for the Offer (the “Information Agent”), at the address and telephone number set forth below. In addition, requests for additional copies of the Offer to Purchase, the Letter of Transmittal, the notice of guaranteed delivery and other tender offer materials may be directed to the Information Agent. Such copies will be furnished promptly at Purchaser’s expense. You may also contact your broker, dealer, commercial bank, trust company or other nominee for assistance.

Except as set forth in the Offer to Purchase, neither Purchaser nor Parent will pay any fees or commissions to any broker or dealer or any other person for soliciting tenders of Shares pursuant to the Offer. Brokers, dealers, commercial banks, trust companies or other nominees will, upon request, be reimbursed by Purchaser for customary mailing and handling expenses incurred by them in forwarding the Offer materials to their customers.