FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * WAN MARK A   2. Issuer Name and Ticker or Trading Symbol ACELRX PHARMACEUTICALS INC [ACRX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O THREE ARCH PARTNERS, 19 SOUTH B STREET, SUITE 14 3. Date of Earliest Transaction (Month/Day/Year) 05/21/2018 (Street) SAN MATEO, CA 94401 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/21/2018   J   3,347,357 (1) D (5) (6) (7) 0 I See Footnote (1) Common Stock 05/21/2018   J   179,962 (2) D (5) (6) (7) 0 I See Footnote (2) Common Stock 05/21/2018   J   5,713,569 (3) D (5) (6) (7) 0 I See Footnote (3) Common Stock 05/21/2018   J   126,153 (4) D (5) (6) (7) 0 I See Footnote (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
WAN MARK A C/O THREE ARCH PARTNERS 19 SOUTH B STREET, SUITE 14 SAN MATEO, CA 94401	X	X
JAEGER WILFRED E C/O THREE ARCH PARTNERS 19 SOUTH B STREET, SUITE 14 SAN MATEO, CA 94401		X
THREE ARCH PARTNERS IV LP C/O THREE ARCH PARTNERS 19 SOUTH B STREET, SUITE 14 SAN MATEO, CA 94401		X
THREE ARCH PARTNERS III LP C/O THREE ARCH PARTNERS 19 SOUTH B STREET, SUITE 14 SAN MATEO, CA 94401		X
THREE ARCH ASSOCIATES IV LP C/O THREE ARCH PARTNERS 19 SOUTH B STREET, SUITE 14 SAN MATEO, CA 94401		X
THREE ARCH ASSOCIATES III LP C/O THREE ARCH PARTNERS 19 SOUTH B STREET, SUITE 14 SAN MATEO, CA 94401		X

Signatures

/s/ Steve Agelopoulos, Attorney-in-Fact for Mark A. Wan		05/23/2018
**Signature of Reporting Person		Date
/s/ Steve Agelopoulos, Attorney-in-Fact for Wilf Jaeger		05/23/2018
**Signature of Reporting Person		Date
/s/ Steve Agelopoulos, Attorney-in-Fact for the GP of Three Arch Partners IV, L.P.		05/23/2018
**Signature of Reporting Person		Date
/s/ Steve Agelopoulos, Attorney-in-Fact for the GP of Three Arch Partners III, L.P.		05/23/2018
**Signature of Reporting Person		Date
/s/ Steve Agelopoulos, Attorney-in-Fact for the GP of Three Arch Associates IV, L.P.		05/23/2018
**Signature of Reporting Person		Date
/s/ Steve Agelopoulos, Attorney-in-Fact for the GP of Three Arch Associates III, L.P.		05/23/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	The shares are owned directly by Three Arch Partners III, L.P. ("TAP III"). Three Arch Management III, L.L.C. ("TAM III"), the general partner of TAP III, had sole voting and dispositive power with respect to the securities held by TAP III. Mark A. Wan and Wilfred Jaeger, the managing members of TAM III, shared the voting and dispositive power with respect to the shares held by TAP III. Such persons and entities disclaim beneficial ownership of the shares held by TAP III except to the extent of any pecuniary interest therein. See Explanation of Responses #5 for more information.
(2)	The shares are owned directly by Three Arch Associates III, L.P. ("TAA III"). TAM III, the general partner of TAA III, had sole voting and dispositive power with respect to the securities held by TAA III. Mark A. Wan and Wilfred Jaeger, the managing members of TAM III, shared the voting and dispositive power with respect to the shares held by TAA III. Such persons and entities disclaim beneficial ownership of the shares held by TAA III except to the extent of any pecuniary interest therein. See Explanation of Responses #5 for more information.
(3)	The shares are owned directly by Three Arch Partners IV, L.P. ("TAP IV"). Three Arch Management IV, L.L.C. ("TAM IV"), the general partner of TAP IV, had sole voting and dispositive power with respect to the securities held by TAP IV. Mark A. Wan and Wilfred Jaeger, the managing members of TAM IV, shared the voting and dispositive power with respect to the shares held by TAP IV. Such persons and entities disclaim beneficial ownership of the shares held by TAP IV except to the extent of any pecuniary interest therein. See Explanation of Responses #5 for more information.
(4)	The shares are owned directly by Three Arch Associates IV, L.P. ("TAA IV"). TAM IV, the general partner of TAA IV, had sole voting and dispositive power with respect to the securities held by TAA IV. Mark A. Wan and Wilfred Jaeger, the managing members of TAM IV, shared the voting and dispositive power with respect to the shares held by TAA IV. Such persons and entities disclaim beneficial ownership of the shares held by TAA IV except to the extent of any pecuniary interest therein. See Explanation of Responses #5 for more information.
(5)	On May 21, 2018, the TAP III, TAP IV, TAA III and TAA IV (the "Affiliated Entities") and certain other affiliates of the Affiliated Entities and Leerink Revelation Healthcare Fund I, L.P., Industry Ventures Secondary VIII, L.P. and Kline Hill Partners Fund II LP (the "Purchasers") entered into a purchase agreement (the "Purchase Agreement") pursuant to which the Affiliated Entities agreed to a sale to the Purchasers (the "Portfolio Sale") of a portfolio of assets held by the Affiliated Entities consisting of the securities of private and public companies, including the 9,367,041 shares of Common Stock (the "AcelRx Shares") of AcelRx Pharmaceuticals, Inc. (the "Issuer") and other investment interests. The transfer of the AcelRx Shares and the securities of another portfolio asset (such securities together with the AcelRx Shares, the "Initial Closing Securities") was consummated at an initial closing on May 21, 2018 to the Purchasers.
(6)	(Continued From Footenote 5) The Portfolio Sale was undertaken for portfolio management purposes in connection with the imminent expiration of the terms of the Affiliated Entities under their respective governing agreements, as the Affiliated Entities were initially formed between 1999 and 2004 with initially contemplated terms of ten years. The Portfolio Sale was undertaken as a result of the imminent dissolution of the Affiliated Entities due to the upcoming expiration of the terms under the governing agreements. The Portfolio Sale is not being undertaken as a result of an adverse change in the Affiliated Entities' views on the prospects of the Issuer, or its businesses, management or directors. Wan, a director of the Issuer and affiliate of the Affiliated Entities, will continue serving as a member of the Issuer's Board of Directors after the Portfolio Sale.
(7)	(Continued From Footenote 6) The aggregate purchase price to be paid by the Purchasers in the Portfolio Sale is $30 million in up front consideration, plus a residual amount calculated based on, among other things, the trading price of the AcelRx Shares and certain other securities as of the end of calendar year 2018, up to a maximum aggregate amount of $12.5 million in additional consideration (the "Residual Consideration"). The Initial Closing Securities sold by the Affiliated Entities in the Portfolio Sale were priced on an aggregate basis, for total consideration in the range of $25 million to $37.5 million, depending upon the amount of Residual Consideration eventually paid. Because the Initial Closing Securities sold by the Affiliated Entities in the Portfolio Sale were price on an aggregate basis, a price per share was not separately determined for the AcelRx Shares.

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