SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) Amendment #2 ADA-ES Inc. (NAME OF ISSUER) Common Stock no par value (TITLE OF CLASS OF SECURITIES) 005208103 (CUSIP NUMBER) Paul D. Sonkin Hummingbird Management, LLC (f/k/a Morningside Value Investors, LLC) 153 East 53rd Street, 55th Floor New York, New York 10022 212-521-0975 (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON AUTHORIZED TO RECEIVE NOTICES AND COMMUNICATIONS) February 13, 2004 (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box. [ ] Note: Schedules filed in paper format shall include a signed original and five copies of the Schedule, including all exhibits. See Rule 13d-7(b) for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). (Continued on following pages) (Page 1 of 6 pages) CUSIP No. 005208103 13D/A Page 2 of 6 Pages ------------------------------------------------------------------------------ 1. NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Hummingbird Management, LLC (f/k/a Morningside Value Investors, LLC) IRS No. 13-4082842 ------------------------------------------------------------------------------ 2. CHECK THE APPROPRIATE BOX IF A GROUP* (a) [x] (b) [ ] ------------------------------------------------------------------------------ 3. SEC USE ONLY ------------------------------------------------------------------------------ 4. SOURCES OF FUNDS OO ------------------------------------------------------------------------------ 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] ------------------------------------------------------------------------------ 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------ NUMBER OF 7. SOLE VOTING POWER 0 SHARES ------------------------------------------------------------ BENEFICIALLY 8. SHARED VOTING POWER 315,283 OWNED BY ------------------------------------------------------------ EACH 9. SOLE DISPOSITIVE POWER 309,465 REPORTING ------------------------------------------------------------ PERSON WITH 10. SHARED DISPOSITIVE POWER 0 ------------------------------------------------------------------------------ 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 315,283 ------------------------------------------------------------------------------ 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES * [ ] ------------------------------------------------------------------------------ 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 8.8% ------------------------------------------------------------------------------ 14. TYPE OF REPORTING PERSON* OO ------------------------------------------------------------------------------ (Page 2 of 6 Pages) CUSIP No. 005208103 13D/A Page 3 of 6 Pages ------------------------------------------------------------------------------ 1. NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Paul D. Sonkin ------------------------------------------------------------------------------ 2. CHECK THE APPROPRIATE BOX IF A GROUP* (a) [x] (b) [ ] ------------------------------------------------------------------------------ 3. SEC USE ONLY ------------------------------------------------------------------------------ 4. SOURCES OF FUNDS PF ------------------------------------------------------------------------------ 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) [ ] ------------------------------------------------------------------------------ 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA ------------------------------------------------------------------------------ NUMBER OF 7. SOLE VOTING POWER 0 SHARES ------------------------------------------------------------ BENEFICIALLY 8. SHARED VOTING POWER 315,283 OWNED BY ------------------------------------------------------------ EACH 9. SOLE DISPOSITIVE POWER 5,815 REPORTING ------------------------------------------------------------ PERSON WITH 10. SHARED DISPOSITIVE POWER 0 ------------------------------------------------------------------------------ 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 315,283 ------------------------------------------------------------------------------ 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES * [ ] ------------------------------------------------------------------------------ 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 8.8% ------------------------------------------------------------------------------ 14. TYPE OF REPORTING PERSON* IN ------------------------------------------------------------------------------ (Page 3 of 6 Pages) CUSIP No. 005208103 13D/A Page 4 of 6 Pages AMENDMENT NO. 2 TO SCHEDULE 13D This Amendment No. 2, dated March 16, 2004, to Schedule 13D is filed by the Reporting Persons and amends Schedule 13D/A as previously filed by the Reporting Persons with the Securities and Exchange Commission on January 28, 2004 (the "Schedule 13D"), relating to the Common Stock no par value (the "Common Stock") of ADE-ES, a Colorado corporation. Items 3 and 5 of the Schedule 13D are hereby amended and restated, as follows: ITEM 3 SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION As of March 16, 2004, Hummingbird has caused each of HVF, Microcap Fund and Concentrated Fund to invest approximately $679,698, $505,605, and $973,267 respectively, in the Shares of the Issuer using their respective working capital. Sonkin has invested $5,407 in Shares of the issuer using Personal Funds. ITEM 5 INTEREST IN SECURITIES OF THE ISSUER (a) The Reporting Persons aggregately beneficially own 315,283, or 8.8% of the Common Stock of the Issuer, based upon 3,582,230 shares outstanding as of November 7, 2003, as reported on the latest 10-QSB of the Issuer. (b) Hummingbird has shared voting power over 315,283 Shares of the Issuer. Hummingbird has sole dispositive power over 309,465 Shares. As the holder of sole voting and investment authority over the Shares owned by HVF, the Microcap Fund and the Concentrated Fund, Hummingbird may be deemed, for purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, to be the beneficial owner of the aggregate amount of 309,465 Shares of the Issuer. Hummingbird disclaims any economic interest or beneficial ownership of the Shares covered by this Statement. (Page 4 of 6 Pages) CUSIP No. 005208103 13D/A Page 5 of 6 Pages Mr. Sonkin is the managing member and control person of Hummingbird, and for purposes of Rule 13d-3 may be deemed the beneficial owner of such Shares deemed to be beneficially owned by Hummingbird. Thus, Mr. Sonkin may be deemed, for purposes of Rule 13d-3, to be the beneficial owner of 309,465 Shares of the Issuer Mr. Sonkin disclaims any economic interest or beneficial ownership of these Shares. Mr. Sonkin is also the owner of 5,815 Shares and has sole dispositive power over 5,815 Shares. He has shared voting power over 315,283 Shares. (c) Hummingbird caused HVF to effect transactions in the Shares during the past 60 days as set forth below: AMOUNT OF DATE TYPE SHARES PRICE/SHARE ---- ---- ------ ----------- 1/23/2004 open market purchase 3,100 8.473 3/15/2004 open market purchase 3,150 6.927 Hummingbird caused the Microcap Fund to effect transactions in the Shares during the past 60 days as set forth below: AMOUNT OF DATE TYPE SHARES PRICE/SHARE ---- ---- ------ ----------- 3/15/04 open market purchase 3,150 6.927 (Page 5 of 6 Pages) CUSIP No. 005208103 13D/A Page 6 of 6 Pages Hummingbird caused the Concentrated Fund to effect transactions in the Shares during the past 60 days as set forth below: AMOUNT OF DATE TYPE SHARES PRICE/SHARE ---- ---- ------ ----------- 1/20/2004 open market purchase 20,000 8.700 1/21/2004 open market purchase 5,400 8.819 1/22/2004 open market purchase 8,000 8.753 1/26/2004 open market purchase 2,300 8.550 1/28/2004 open market purchase 3,200 8.450 1/29/2004 open market purchase 6,000 8.465 1/30/2004 open market purchase 2,000 8.400 2/4/2004 open market purchase 2,100 8.500 2/5/2004 open market purchase 1,500 8.500 2/6/2004 open market purchase 3,000 8.300 2/6/2004 open market purchase 500 8.300 2/9/2004 open market purchase 1,000 8.400 2/10/2004 open market purchase 7,814 8.377 2/11/2004 open market purchase 1,650 8.300 2/13/2004 open market purchase 15,700 8.300 2/17/2004 open market purchase 6,000 8.133 3/11/2004 open market purchase 5,500 7.639 3/12/2004 open market purchase 11,540 7.235 3/15/2004 open market purchase 2,000 6.927 Sonkin has effected no transactions in the Shares on his own behalf during the past 60 days.. (d) Inapplicable. (e) Inapplicable. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, we certify that the information set forth in this statement is true, complete and correct. Dated: March 16, 2004 HUMMINGBIRD MANAGEMENT, LLC By: /s/ Paul D. Sonkin ----------------------------- Name: Paul D. Sonkin Title: Managing Member By: /s/ Paul D. Sonkin ----------------------------- Name: Paul D. Sonkin