Filed pursuant to Rule 424(b)(3) Registration No. 333-118919 PROSPECTUS SUPPLEMENT NO. 1 (TO PROSPECTUS DATED JUNE 21, 2005) LabOne, Inc. LabOne, Inc. $103,500,000 Principal Amount of 3.50% Convertible Senior Debentures Due 2034 -------------------- Common Stock Issuable upon Conversion of the Debentures -------------------- This prospectus supplement relates to resales by selling security holders of 3.50% Convertible Senior Debentures Due 2034 and common stock issuable upon conversion of the Debentures (including preferred stock purchase rights attached to the common stock under our stockholder rights plan). We will not receive any proceeds from the offering of these securities by the selling security holders. This prospectus supplement should be read in conjunction with, and may not be delivered or utilized without, our prospectus dated June 21, 2005. Investing in these securities involves risks. See "Risk Factors" beginning on page 8 of the prospectus. ---------------- Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense. The date of this prospectus supplement is July 5, 2005. The information set forth below supersedes the information contained under the caption "Selling Security Holders" in our prospectus. SELLING SECURITY HOLDERS We issued the Debentures in a private offering in June and July 2004. The initial purchasers have advised us that they resold the Debentures to qualified institutional buyers under Rule 144A under the Securities Act. The Debentures and the common stock that are offered for resale by this prospectus are offered for the accounts of the selling security holders. These subsequent purchasers, or their transferees, pledgees, donees or successors, may from time to time offer and sell any or all of the Debentures and/or the common stock issuable upon conversion of the Debentures pursuant to this prospectus. The following table sets forth certain information with respect to the selling security holders and the principal amount of Debentures and the number of shares of our common stock that are beneficially owned by each selling security holder and that may be offered and sold from time to time pursuant to this prospectus. The information is based solely on information provided by or on behalf of the selling security holders set forth below, and we have not independently verified the information. Except as indicated below, none of the selling security holders set forth below has had any position, office or other material relationship with us or our affiliates within the past three years. 1 ------------------------------------------------------------------------------------------------------------------------- Name Principal Principal Number of Number of Amount of Debentures Amount of Shares of Shares of Beneficially Debentures That Common Stock Common Owned ($) May Be Beneficially Stock That Sold ($) (1) Owned May Be Sold (2)(3) (1)(3) ------------------------------------------------------------------------------------------------------------------------- Alabama Children's Hospital Foundation 65,000 65,000 1,654.01 1,654.01 ------------------------------------------------------------------------------------------------------------------------- Arkansas PERS 400,000 400,000 10,178.52 10,178.52 ------------------------------------------------------------------------------------------------------------------------- Astrazencea Holdings Pension 120,000 120,000 3,053.56 3,053.56 ------------------------------------------------------------------------------------------------------------------------- BNP Paribas Equity Strategies, SNC(4) 508,000 508,000 15,185.72(5) 12,926.72 ------------------------------------------------------------------------------------------------------------------------- Boilermakers Blacksmith Pension Fund 515,000 515,000 13,104.84 13,104.84 ------------------------------------------------------------------------------------------------------------------------- CALAMOS Market Neutral Fund- 4,200,000 4,200,000 106,874.46 106,874.46 CALAMOS Investment Trust ------------------------------------------------------------------------------------------------------------------------- CNH CA Master Account L.P. 250,000 250,000 6,361.58 6,361.58 ------------------------------------------------------------------------------------------------------------------------- Commission of the Land Office 600,000 600,000 15,267.78 15,267.78 ------------------------------------------------------------------------------------------------------------------------- Consulting Group Capital Markets Funds 800,000 800,000 20,357.04 20,357.04 ------------------------------------------------------------------------------------------------------------------------- Cooperneff Convertible Strategies 260,000 260,000 6,616.04 6,616.04 (Cayman) Master Fund LP ------------------------------------------------------------------------------------------------------------------------- CQS Convertible and Quantitative 1,000,000 1,000,000 25,446.30 25,446.30 Strategies Master Fund Limited ------------------------------------------------------------------------------------------------------------------------- Credit Suisse First Boston Europe 7,500,000 7,500,000 190,847.25 190,847.25 LTD (4) ------------------------------------------------------------------------------------------------------------------------- Delaware PERS 230,000 230,000 5,852.65 5,852.65 ------------------------------------------------------------------------------------------------------------------------- Delta Airlines Master Trust 130,000 130,000 3,308.02 3,308.02 ------------------------------------------------------------------------------------------------------------------------- DKR Sound Shore Opportunity Fund Ltd. 200,000 200,000 5,089.26 5,089.26 ------------------------------------------------------------------------------------------------------------------------- Duke Endowment 110,000 110,000 2,799.09 2,799.09 ------------------------------------------------------------------------------------------------------------------------- Fore Convertible Master Fund, Ltd. 1,839,000 1,839,000 46,795.75 46,795.75 ------------------------------------------------------------------------------------------------------------------------- Fore Plan Asset Fund, Ltd. 175,000 175,000 4,453.10 4,453.10 ------------------------------------------------------------------------------------------------------------------------- Froley Revy Investment Convertible 30,000 30,000 763.39 763.39 Security Fund ------------------------------------------------------------------------------------------------------------------------- Grace Convertible Arbitrage Fund, LTD 4,600,000 4,600,000 117,052.98 117,052.98 ------------------------------------------------------------------------------------------------------------------------- Guggenheim Portfolio Company VIII 305,000 305,000 7,761.12 7,761.12 (Cayman), Ltd (4) ------------------------------------------------------------------------------------------------------------------------- Highbridge International LLC (4) 7,500,000 7,500,000 190,847.25 190,847.25 ------------------------------------------------------------------------------------------------------------------------- ICI American Holdings Trust 90,000 90,000 2,290.17 2,290.17 ------------------------------------------------------------------------------------------------------------------------- Institutional Benchmarks Master 1,000,000 1,000,000 25,446.30 25,446.30 Funds L.P. ------------------------------------------------------------------------------------------------------------------------- Institutional Benchmark Management 160,000 160,000 4,071.41 4,071.41 Fund ------------------------------------------------------------------------------------------------------------------------- JP Morgan Securities Inc. (6) 2,500,000 2,500,000 63,615.75 63,615.75 ------------------------------------------------------------------------------------------------------------------------- 2 ------------------------------------------------------------------------------------------------------------------------- Kamunting Street Master Fund Ltd. 1,500,000 1,500,000 38,169.45 38,169.45 ------------------------------------------------------------------------------------------------------------------------- Lighthouse Multi-Strategy Master 125,000 125,000 3,180.79 3,180.79 Fund LP ------------------------------------------------------------------------------------------------------------------------- Lord Abbett Investment Trust - LA 2,000,000 2,000,000 50,892.60 50,892.60 Convertible Fund ------------------------------------------------------------------------------------------------------------------------- Louisiana CCRF 45,000 45,000 1,145.08 1,145.08 ------------------------------------------------------------------------------------------------------------------------- Lyxor/Convertible Arbitrage Fund 69,000 69,000 1,755.79 1,755.79 Limited ------------------------------------------------------------------------------------------------------------------------- Lyxor/Quest Fund Ltd. 825,000 825,000 20,993.20 20,993.20 ------------------------------------------------------------------------------------------------------------------------- Man Mac I Limited 681,000 681,000 17,328.93 17,328.93 ------------------------------------------------------------------------------------------------------------------------- Newport Alternative Income Fund 260,000 260,000 6,616.04 6,616.04 ------------------------------------------------------------------------------------------------------------------------- Northwestern Mutual Life Insurance 1,000,000 1,000,000 25,446.30 25,446.30 Company (4) ------------------------------------------------------------------------------------------------------------------------- OCLC Online Computer Library 10,000 10,000 254.46 254.46 Center Inc ------------------------------------------------------------------------------------------------------------------------- Pebble Limited Partnership 140,000 140,000 3,562.48 3,562.48 ------------------------------------------------------------------------------------------------------------------------- Piper Jaffray & Co. (6) 4,000,000 4,000,000 101,785.20 101,785.20 ------------------------------------------------------------------------------------------------------------------------- Polaris Vega Fund L.P. 5,250,000 5,250,000 133,593.07 133,593.07 ------------------------------------------------------------------------------------------------------------------------- Prudential Insurance Co of America (4) 25,000 25,000 636.16 636.16 ------------------------------------------------------------------------------------------------------------------------- Quatrro Fund Ltd 3,600,000 3,600,000 91,606.68 91,606.68 ------------------------------------------------------------------------------------------------------------------------- Quattro Multistrategy Master Fund LP 240,000 240,000 6,107.11 6,107.11 ------------------------------------------------------------------------------------------------------------------------- Quest Global Convertible Master 300,000 300,000 7,633.89 7,633.89 Fund Ltd. ------------------------------------------------------------------------------------------------------------------------- RHP Master Fund, Ltd. 4,500,000 4,500,000 114,508.35 114,508.35 ------------------------------------------------------------------------------------------------------------------------- SilverCreek II Limited 800,000 800,000 20,357.04 20,357.04 ------------------------------------------------------------------------------------------------------------------------- SilverCreek Limited Partnership 800,000 800,000 20,357.04 20,357.04 ------------------------------------------------------------------------------------------------------------------------- Singlehedge US Convertible 75,000 75,000 1,908.47 1,908.47 Arbitrage Fund ------------------------------------------------------------------------------------------------------------------------- State of Oregon / Equity 1,225,000 1,225,000 31,171.72 31,171.72 ------------------------------------------------------------------------------------------------------------------------- Stonebridge Life Insurance (4) 500,000 500,000 12,723.15 12,723.15 ------------------------------------------------------------------------------------------------------------------------- Sturgeon Limited 88,000 88,000 2,239.27 2,239.27 ------------------------------------------------------------------------------------------------------------------------- Sunrise Partners Limited 8,500,000 8,500,000 217,028.55(5) 216,293.55 Partnership (4) ------------------------------------------------------------------------------------------------------------------------- Syngenta AG 70,000 70,000 1,781.24 1,781.24 ------------------------------------------------------------------------------------------------------------------------- Transamerica Life Insurance and 4,000,000 4,000,000 101,785.20 101,785.20 Annuities Corp. (4) ------------------------------------------------------------------------------------------------------------------------- Tribeca Global Convertible 6,000,000 6,000,000 152,677.80 152,677.80 Investments LTD ------------------------------------------------------------------------------------------------------------------------- Vicis Capital Master Fund 3,000,000 3,000,000 76,338.90 76,338.90 ------------------------------------------------------------------------------------------------------------------------- Zazove Convertible Arbitrage Fund L.P. 6,000,000 6,000,000 152,677.80 152,677.80 ------------------------------------------------------------------------------------------------------------------------- Zazove Hedged Convertible Fund L.P. 1,000,000 1,000,000 25,446.30 25,446.30 ------------------------------------------------------------------------------------------------------------------------- (1) Because a selling security holder may sell all or a portion of the Debentures and common stock issuable upon conversion of the Debentures pursuant to this prospectus, no estimate can be given as to the number or percentage of Debentures and common stock that the selling security holder will hold upon termination of any sales. (2) Includes shares of common stock issuable upon conversion of the Debentures. (3) The number of shares of our common stock issuable upon conversion of the Debentures assumes a holder would receive the maximum number of shares of common stock issuable in connection with the conversion of the full amount of Debentures held by such holder at the initial conversion rate of 25.4463 shares per $1,000 principal amount of 3 Debentures. This conversion rate is subject to adjustment as described under "Description of the Debentures - Conversion Rights." Accordingly, the maximum number of shares of common stock issuable upon conversion of the Debentures may increase or decrease from time to time. Under the terms of the indenture, fractional shares will not be issued upon conversion of the Debentures; cash will be paid in lieu of fractional shares, if any. (4) Affiliate of a broker-dealer, based upon information provided to us by the selling security holder. (5) Includes shares of common stock beneficially owned other than common stock issuable upon conversion of the Debentures. (6) JP Morgan and Piper Jaffray & Co. were initial purchasers in our private offering of Debentures in June and July, 2004. JP Morgan Securities Inc. is a broker-dealer, based upon information provided to us by JP Morgan Securities Inc. Piper Jaffray & Co. is a broker-dealer, based upon information provided to us by Piper Jaffray & Co. Information about other selling security holders, other than any direct or indirect transferee of a selling security holder named above, will be set forth in post-effective amendments to the registration statement of which this prospectus is a part. Under the registration rights agreement that we entered into with respect to the Debentures, we are not required to file more than one post-effective amendment per calendar quarter to name new selling security holders and may coordinate such filing with the filing of our annual report on Form 10-K or quarterly report on Form 10-Q during such calendar quarter. The selling security holders identified above may have sold, transferred or otherwise disposed of all or a portion of their Debentures or common stock since the date on which the information in the preceding table is presented. Information concerning the selling security holders may change from time to time and any such changed information will be set forth in prospectus supplements or, to the extent required, post-effective amendments to the registration statement. Each selling security holder who is an affiliate of a broker-dealer has informed us that such selling security holder purchased the securities in the ordinary course of business and, at the time of the purchase of the securities, did not have any agreements or understandings, directly or indirectly, with any person to distribute the securities. 4 -------------------------------------------------------------------------------- You should rely only on the information contained in or incorporated by reference into this prospectus. We have not authorized anyone to provide you with different information, and you should not rely on any such information. The securities covered by this prospectus are not offered in any jurisdiction where offers to sell, or solicitations of offers to purchase, such securities are unlawful. You should not assume that the information in this prospectus, and the documents incorporated by reference herein, is accurate as of any date other than their respective dates. Our business, financial condition, results of operations and prospects may have changed since such dates. LabOne, Inc. $103,500,000 Principal Amount of 3.50% Convertible Senior Debentures Due 2034 -------------------- Common Stock Issuable upon Conversion of the Debentures PROSPECTUS SUPPLEMENT NO. 1 (TO PROSPECTUS DATED JUNE 21, 2005) July 5, 2005 --------------------------------------------------------------------------------