The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE

OMB APPROVAL
OMB Number: 3235-0006
Estimated average burden
hours per response: 23.8

Report for the Calendar Year or Quarter Ended: 03-31-2015
Check here if Amendment    Amendment Number:
This Amendment (Check only one.):    is a restatement.
   adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name: DAVIDSON D A & CO
Address: 8 THIRD ST NORTH
GREAT FALLS, MT  59401
Form 13F File Number: 028-07602

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:
Name: Joely Meighan
Title: SVP, Director of Managed Assets
Phone: 206-289-4075
Signature, Place, and Date of Signing:
Joely Meighan SeattleWA 04-24-2015
[Signature] [City, State] [Date]
Report Type (Check only one.):
   13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)
   13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)
X 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)
List of Other Managers Reporting for this Manager:
[If there are no entries in this list, omit this section.]
Form 13F File Number Name
028-05119 Alta Capital Management
  Ashfield Capital Partners LLC
  Aston Asset Management
  Atalanta Sosnoff Management
  C.S. McKee
  Confluence Inv Management LLC
  Contravisory
  D. A. Davidson & Co.
028-10301 Davidson Investment Advisors
  Davis Investment Advisors
028-01666 Eagle Asset Management
  Efficient Market Advisors
  Elessar Investment Management, LLC
028-01283 Estabrook Capital Management
  F-Squared AlphaSector
  Granite Investment Partners
  Hahn
  Harding Loevner
028-10649 Hays Advisory
028-03955 John Hancock Asset Management
  Kelly Capital Management
  Legg Mason
  Lesa Sroufe & Co.
  Marshfield Associates Inc
  McDonnell Investment Mgmt
  Miller, Tabak & Co. LLC
  Nuveen
028-06668 Oak Ridge Investments
  Ocean Park
  Pacific Income Advisors
  Parametric Portfolio Associates
  Placemark
028-00970 RNC Genter Capital Management
  Reinhart Partners, Inc.
  Riverbridge Partners, LLC
  SFE Investment Counsel
  SIGMA
  Sage Advisory Services, Ltd. Co.
  SeaCap Investment Advisors
  Sovereign
  Sterling Capital
028-06605 Thornburg Investment Management
  Todd Investment Advisors
  Uniplan Real Estate Advisors
  Victory Capital Management
  Wedgewood Partners, Inc.
Form 13F Summary Page
Report Summary:
Number of Other Included Managers: 46
Form 13F Information Table Entry Total: 4,453
Form 13F Information Table Value Total: 3,046,591,000
(thousands)
List of Other Included Managers:
Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.
[If there are no entries in this list, state “NONE” and omit the column headings and list entries.]
No. Form 13F File Number Name
1 028-05119 Alta Capital Management
2   Ashfield Capital Partners LLC
3   Aston Asset Management
4   Atalanta Sosnoff Management
5   C.S. McKee
6   Confluence Inv Management LLC
7   Contravisory
8   D. A. Davidson & Co.
9 028-10301 Davidson Investment Advisors
10   Davis Investment Advisors
11 028-01666 Eagle Asset Management
12   Efficient Market Advisors
13   Elessar Investment Management, LLC
14 028-01283 Estabrook Capital Management
15   F-Squared AlphaSector
16   Granite Investment Partners
17   Hahn
18   Harding Loevner
19 028-10649 Hays Advisory
20 028-03955 John Hancock Asset Management
21   Kelly Capital Management
22   Legg Mason
23   Lesa Sroufe & Co.
24   Marshfield Associates Inc
25   McDonnell Investment Mgmt
26   Miller, Tabak & Co. LLC
27   Nuveen
28 028-06668 Oak Ridge Investments
29   Ocean Park
30   Pacific Income Advisors
31   Parametric Portfolio Associates
32   Placemark
33 028-00970 RNC Genter Capital Management
34   Reinhart Partners, Inc.
35   Riverbridge Partners, LLC
36   SFE Investment Counsel
37   SIGMA
38   Sage Advisory Services, Ltd. Co.
39   SeaCap Investment Advisors
40   Sovereign
41   Sterling Capital
42 028-06605 Thornburg Investment Management
43   Todd Investment Advisors
44   Uniplan Real Estate Advisors
45   Victory Capital Management
46   Wedgewood Partners, Inc.