UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 11-K

þ		ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (No fee required)

For the Fiscal Year Ended December 31, 2007

o		TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 (No fee required)

For the transition period from                      to                     

A. Full title of the plan and the address of the plan, if different from that of the issuer named below:

PIPER JAFFRAY COMPANIES RETIREMENT PLAN

B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

 

 

Piper Jaffray Companies Retirement Plan
Financial Statements and Supplemental Schedule

Contents

Page
Report of Independent Registered Public Accounting Firm	3
Audited Financial Statements
Statements of Net Assets Available for Benefits	4
Statements of Changes in Net Assets Available for Benefits	5
Notes to Financial Statements	6
Supplemental Schedule
Schedule H, Line 4i — Schedule of Assets (Held at End of Year)	11
Consent of Independent Registered Public Accounting Firm

Report of Independent Registered Public Accounting Firm

The Plan Administrator and Participants
Piper Jaffray Companies Retirement Plan

We have audited the accompanying statements of net assets available for benefits of the Piper Jaffray Companies Retirement Plan as of December 31, 2007 and 2006, and the related statements of changes in net assets available for benefits for the years then ended. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Plan’s internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 2007 and 2006, and the changes in its net assets available for benefits for the years then ended, in conformity with U.S. generally accepted accounting principles.

Our audits were performed for the purpose of forming an opinion on the financial statements taken as a whole. The accompanying supplemental schedule of assets (held at end of year) as of December 31, 2007, is presented for purposes of additional analysis and is not a required part of the financial statements but is supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. This supplemental schedule is the responsibility of the Plan’s management. The supplemental schedule has been subjected to the auditing procedures applied in our audits of the financial statements and, in our opinion, is fairly stated in all material respects in relation to the financial statements taken as a whole.

/s/ Ernst & Young LLP

June 18, 2008

Piper Jaffray Companies Retirement Plan

		December 31,				December 31,
(Dollars in thousands)		2007				2006
Assets
Investments, at fair value:
Mutual funds		$	99,276			$	106,716
Common/collective trust			9,132				9,870
Piper Jaffray Companies Stock Fund			8,300				13,675
Participant loans			1,139				1,339
Total investments			117,847				131,600
Cash and cash equivalents			3				1,394
Receivables:
Mutual fund rebate receivable			157				100
Employer contributions receivable			3,704				599
Total receivables			3,861				699
Liabilities
Payables:
Rollovers in transit			—				(96	)
Total payables			—				(96	)
Net assets available for benefits at fair value			121,711				133,597
Adjustment from fair value to contract value for interest in collective trust relating to fully benefit-responsive investment contracts			104				181
Net assets available for benefits		$	121,815			$	133,778

See Notes to Financial Statements

Piper Jaffray Companies Retirement Plan

		For the Year Ended December 31,
(Dollars in thousands)		2007				2006
Additions:
Investment income:
Net appreciation/(depreciation) in fair value of investments		$	(1,154	)		$	20,517
Interest and dividends			7,080				6,733
Mutual fund rebates			353				385
Total investment income			6,279				27,635
Contributions:
Employer — cash			—				4,402
Employer — noncash			3,704				599
Participants			9,793				19,399
Rollovers and transfers in			1,478				2,562
Total contributions			14,975				26,962
Deductions:
Participant withdrawals			(32,922	)			(81,333	)
Administrative fees			(295	)			(217	)
Total deductions			(33,217	)			(81,550	)
Net decrease in net assets available for benefits			(11,963	)			(26,953	)
Net assets available for benefits, beginning of year			133,778				160,731
Net assets available for benefits, end of year		$	121,815			$	133,778

See Notes to Financial Statements

Piper Jaffray Companies Retirement Plan

1. Description of the Plan

General

     The Piper Jaffray Companies Retirement Plan (the “Plan”) is a contributory defined contribution plan covering employees of Piper Jaffray Companies (the “Company”). The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”). The following provides only general terms of the Plan. A complete description of the Plan is available from the Company.

     During 2006, the Company sold its Private Client Services (“PCS”) branch network to UBS Financial Services, Inc., a subsidiary of UBS AG (“UBS”). As a result of this sale, the Plan incurred a partial termination. See Note 9 for further discussion.

Contributions

     Beginning the first of the month subsequent to commencement of employment, participants may contribute between 1 and 50 percent of their recognized compensation, as defined in the Plan, for each pay period up to an annual maximum of $15,500 for 2007. In addition, participants who have attained age 50 before the end of the Plan year are eligible to make catch-up contributions through payroll deductions to an annual maximum of $5,000 in 2007.

     Participants may also contribute amounts representing distributions from other qualified defined benefit or defined contribution plans.

     Effective January 1, 2007, the Company amended the Plan to match 100 percent of the first six percent of recognized compensation contributed by the participant up to the Social Security taxable wage base of $97,500 for 2007 (“Matching Contribution”). Participants are eligible for the Company’s Matching Contribution beginning on the January 1 subsequent to the commencement of a participant’s employment. The Matching Contribution is generally paid following the end of the Plan year and participants must be employed on the date of payment to receive the Company Matching Contribution. Prior to January 1, 2007, the Matching Contribution was four percent.

     Prior to 2007 amounts were contributed on behalf of eligible participants, at the option of the Company’s management and Board of Directors (“Profit Sharing Contribution”). Effective January 1, 2007, the Plan was amended to eliminate the Profit Sharing Contribution component going forward.

Vesting

     Participants are immediately vested in their contributions made to the Plan from their recognized compensation and the earnings thereon. In addition, participants are immediately vested in the Company’s Matching Contribution and earnings thereon. Vesting in the Company’s Profit Sharing Contribution and earnings thereon is based on years of continued services. A participant is 100 percent vested in their Profit Sharing Contribution after five years of service from the date of entrance into the Plan, with at least 1,000 hours of service in each Plan year. Additionally, participants become 100 percent vested in Profit Sharing Contributions when they reach age 59 ¹/2 or terminate employment as a result of becoming totally or permanently disabled or death.

Participant Accounts

     Separate accounts are maintained for each participant whereby the participant’s account is credited with the participant’s contributions and allocations of (a) the Company’s contributions and (b) plan earnings. Allocations are based on participant earnings or account balances, as defined.

     Forfeited account balances of terminated participants’ nonvested accounts are used to first reinstate the accounts of rehired participants. If a participant returns to the Company and completes a year of vesting service before the participant has five consecutive one-year breaks in service, the forfeited amount will be reinstated to the participant’s account at the end of that year. At December 31, 2007, forfeited nonvested accounts totaled $268,521.

Participant Loans

     Participants may borrow from their fund accounts a minimum of $1,000 up to a maximum of the lesser of $50,000 or 50 percent of their account balance. Loan terms range up to 5 years or up to 15 years if the loan is used towards the purchase of a primary residence. The loans are secured by the balance in the participant’s account and bear a fixed interest rate of one percent over the prime rate for the business day preceding the date the loan is granted. Principal and interest are paid ratably through semi-monthly payroll deductions. Participants who terminate employment with outstanding loan balances have 90 days from the last day of their employment to pay the balance of their loan in full. Loans not repaid within that timeframe will be reported as taxable distributions.

Benefits

     After reaching the age of 59 1/2, a participant may elect to withdraw all or a portion of the value of their account without penalty. Hardship withdrawals by actively employed participants before the age of 59 1/2 are permitted for pre-tax contributions, only after meeting specified criteria, as defined in the Plan. Actively employed participants prior to the age of 59 1/2 can also elect to withdraw all or a portion of the rollover contributions or transferred contributions made to the Plan. Although hardship and rollover withdrawals are allowed, a participant may be subject to a 10 percent federal penalty tax.

     If a participant’s employment ends for reasons other than total or permanent disability or death and the balance is less than $1,000, a distribution made before the age of 59 1/2 must be paid to the participant in the form of a lump-sum payment or direct rollover. If the participant’s balance exceeds $1,000, payment will not be made before age 70 1/2 without prior consent. The following options of distribution are available: lump-sum distribution, direct rollover, partial distribution or installment distribution (available only if participant’s balance exceeds $5,000). Upon death, the balance in the participant’s account is paid to the designated beneficiary in one of the above mentioned distribution options.

2. Summary of Significant Accounting Policies

Basis of Accounting

     The accompanying financial statements are prepared on the accrual basis of accounting in conformity with U.S. generally accepted accounting principles.

New Accounting Pronouncement

     In September 2006, the Financial Accounting Standards Board (“FASB”) issued Statement of Financial Accounting Standards No. 157, “Fair Value Measurements” (“SFAS 157”). SFAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures regarding fair value measurements. SFAS 157 does not require any new fair value measurements, but its application may, for some entities, change current practice. Changes to current practice stem from the revised definition of fair value and the application of this definition within the framework established by SFAS 157. SFAS 157 is effective for fiscal years beginning after November 15, 2007. SFAS 157 is not expected to have a material affect on the Plan’s financial statements.

Valuation of Investment Contracts

     As described in Financial Accounting Standards Board Staff Position, FSP AAG INV-1 and SOP 94-4-1, Reporting of Fully Benefit-Responsive Investment Contracts Held by Certain Investment Companies Subject to the AICPA Investment Company Guide and Defined-Contribution Health and Welfare and Pension Plans (the “FSP”), investment contracts (including contracts underlying other investments) held by a defined-contribution plan are required to be reported at fair value. However, contract value is the relevant measurement attribute for that portion of the net assets available for benefits of a defined-contribution plan attributable to fully benefit-responsive investment contracts because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the plan. As required by the FSP, the statements of net assets available for benefits present the fair value of the investment contract as well as the adjustment of the fully benefit-responsive investment contracts from fair value to contract value. The statements of changes in net assets available for benefits are prepared on contract value basis.

Valuation of Investments and Income Recognition

     The Plan’s investments in mutual funds and the Piper Jaffray Companies Stock Fund are stated at fair value. Quoted market/redemption prices are used to value investments. Participant loans are valued at their outstanding balances which approximate fair value. The Plan’s investment in a common/collective trust consists of a fund that invests in guaranteed investment contracts.

     The investment in the common/collective trust is stated at fair value with an adjustment to contract value in accordance with FSP AAG INV-1. Fair value is calculated by discounting the related cash flows based on current yields of similar instruments with comparable durations. Contract value is equal to principle balance plus accrued interest.

     Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date.

Use of Estimates

     The preparation of the financial statements in conformity with United States generally accepted accounting principles requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

3. Investments

     The Retirement Investment Committee oversees the Plan and Trust Agreement. It has the authority to make investment recommendations, such as the replacement of a fund due to the fund’s performance, and has the fiduciary responsibility to ensure the Plan is acting in the best interest of the participants.

     The following table presents the net appreciation/(depreciation) in fair value of investments held by the Plan at December 31:

(Dollars in thousands)		2007				2006
Mutual funds		$	1,533			$	10.344
Common/collective trust			344				478
Piper Jaffray Companies Stock Fund			(3.031	)			9,695
Net appreciation/(depreciation) in fair value of investments		$	(1,154	)		$	20,517

     The fair value of individual investments that represent 5 percent or more of the Plan’s net assets available for benefits at December 31 are as follows:

(Dollars in thousands)		2007				2006
Allianz NFJ Sm Cap Value A Fund		$	13,115			$	15,106
Baron Growth Fund			8,684				9,619
Davis NY Venture Fund A			***				7,049
Europacific Growth Fund — R4			14,280				14,782
First American Stable Asset Select Fund			9,132				9,870
Growth Fund of America — R4			15,065				16,748
PIMCO Total Return Admin. Fund			9,135				9,396
Piper Jaffray Companies Stock Fund			8,300				13,675
Van Kampen Comstock Fund A			8,826				10,500
Vanguard Institutional Index Fund			9,759				10,325

4. Investment in Common/Collective Trust

     The Plan invests in the First American Stable Asset Select Class of the U.S. Bank Stable Asset Fund (“Stable Asset Fund”), which holds benefit-responsive investment contracts. Stable Asset Fund units held by the Plan represent an undivided proportionate interest in all of the assets and liabilities of the Stable Asset Fund. The net asset value of each unit is determined daily, and reflects all earnings, expenses, gains and losses in the Stable Asset Fund. Income on the Stable Asset Fund’s investments are automatically reinvested and reflected in the net asset value of each unit. The Stable Asset Fund is reported at fair value with an adjustment to contract value on the statements of net assets available for benefits.

5. Income Tax Status

     The plan received a determination letter from the Internal Revenue Service dated October 30, 2007 stating that the Plan is qualified under section 401(a) of the Internal Revenue Code (the “Code”) and, therefore, the related trust is exempt from taxation. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification. The Plan administrator believes the Plan is designed and is currently being operated in compliance with the applicable requirements of the Code.

6. Risks and Uncertainties

     The mutual funds of the Plan invest in various investment securities. Investment securities are exposed to various risks, such as interest rate, market, and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities could occur in the near term and that such changes could materially affect participants’ account balances and the amounts reported in the statements of net assets available for benefits and the statements of changes in net assets available for benefits.

7. Related Party Transactions

     The Plan has invested in the Piper Jaffray Companies Stock Fund, which primarily invests in shares of the Company’s common stock. As of December 31, 2007, the Plan’s investment in the Piper Jaffray Companies Stock Fund was comprised primarily of 158,548 shares of Piper Jaffray Companies common stock with a fair market value of $7,343,943. The Plan made purchases and sales of the Company’s common stock of $948,788 and $3,308,074, respectively, during the year ended December 31, 2007.

     On February 1, 2008, the Company made a contribution of shares of the Company’s common stock to the Plan in an amount equal to $3,703,880. The contribution represented the Company’s Matching Contribution for the year ended December 31, 2007.

8. Administrative Expenses

     Except to the extent paid by the Company, all expenses of the Plan, with the exception of loan processing fees, are paid by the Plan as a deduction from its mutual fund rebates received. The Plan receives mutual fund rebates related to its investments in mutual funds. The rebates, net of Plan expenses paid by the Plan, are allocated to Plan participants’ accounts. Loan processing fees of the Plan are paid out of the account of the participant requesting the loan. The Company paid legal and audit fees related to the Plan during 2007 and 2006.

9. Plan Termination

     The Company has the right to terminate the Plan at any time subject to the provisions set forth in ERISA. In the event of a complete or partial termination of the Plan or a permanent discontinuation of contributions to the Plan, each affected participant will become fully vested in their Profit Sharing Contribution regardless of length of service. During 2006, the Plan incurred a partial termination as a result of the sale of the Company’s PCS branch network to UBS. All affected employees were fully vested.

10. Reconciliation of Financial Statements to Form 5500

     The following is a reconciliation of net assets available for benefits per the financial statements to Form 5500 at December 31:

(Dollars in thousands)		2007				2006
Net assets available for benefits per the financial statements		$	121,815			$	133,778
Distributions payable			(74	)			(1,572	)
Adjustment of common/collective trust to fair value			(104	)			(181	)
Net assets available for benefits per the Form 5500		$	121,637			$	132,025

Supplemental Schedule

Piper Jaffray Companies Retirement Plan

EIN: 30-0168701
Plan: 001

Schedule H, Line 4i — Schedule of Assets (Held at End of Year)

December 31, 2007

		Number of				Market
Description		Shares/Units				Value
Common/Collective Trusts:
First American Stable Asset Select Fund		251,872 shares				$	9,132,409
Mutual Funds:
Am Funds US Govt. Fund R4		89,546 shares					1,220,513
PIMCO Total Return Admin. Fund		854,579 shares					9,135,454
Am Funds American H/I Fund R4		58,944 shares					699,078
Cohen & Steers Realty Income Fund A		111,811 shares					1,284,705
Am Funds Investment Co of Am Fund R4		62,389 shares					2,053,231
Vanguard Institutional Index Fund		72,751 shares					9,758,788
Davis NY Venture Fund A		149,616 shares					5,986,129
Van Kampen Comstock Fund A		504,925 shares					8,826,084
Growth Fund of America — R4		446,225 shares					15,064,569
Allianz NFJ Sm Cap Value A Fund		442,639 shares					13,115,403
Baron Growth Fund		171,385 shares					8,684,076
Templeton Growth Fund A		140,632 shares					3,385,022
Europacific Growth Fund — R4		284,692 shares					14,280,146
Oppenheimer Developing Markets A		118,856 shares					5,782,325
							99,275,523
Stock Fund:
Piper Jaffray Companies Stock Fund *		177,318   units					8,299,987
Participant loans (interest rate range: 5.0-9.25%, maturity date range: 3/31/2008-12/31/2021)							1,138,684
Total assets held at end of year						$	117,846,603

SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, Piper Jaffray Companies has duly caused this annual report to be signed on behalf of the Piper Jaffray Companies Retirement Plan by the undersigned hereunto duly authorized.

		PIPER JAFFRAY COMPANIES RETIREMENT PLAN By: Piper Jaffray Companies, Administrator
		/s/ Rebecca C. Pfeifer   Rebecca C. Pfeifer
		Head of Human Resources

Dated: June 18, 2008

EXHIBIT INDEX

Exhibit				Method of
Number		Description		Filing
23.1		Consent of Independent Registered Public Accounting Firm		Filed herewith