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 * ARBORETUM VENTURES II LP   2. Issuer Name and Ticker or Trading Symbol Inogen Inc [INGM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 303 DETROIT STREET, SUITE 301 3. Date of Earliest Transaction (Month/Day/Year) 02/20/2014 (Street) ANN ARBOR, MI 48104 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 02/20/2014   C   112,640 A (1) 123,072 I See Footnote (2) Common Stock 02/20/2014   C   144,174 A (1) 267,246 I See Footnote (2) Common Stock 02/20/2014   C   33,612 A (1) 300,858 I See Footnote (2) Common Stock 02/20/2014   C   75,091 A (1) 82,045 I See Footnote (3) Common Stock 02/20/2014   C   96,114 A (1) 178,159 I See Footnote (3) Common Stock 02/20/2014   C   22,408 A (1) 200,567 I See Footnote (3) Common Stock 02/20/2014   C   43,456 A (1) 43,456 I See Footnote (4) Common Stock 02/20/2014   C   975,846 A (1) 1,019,302 I See Footnote (4) Common Stock 02/20/2014   C   345,168 A (1) 1,364,470 I See Footnote (4) Common Stock 02/20/2014   C   10,181 A (1) 10,181 I See Footnote (5) Common Stock 02/20/2014   C   228,636 A (1) 238,817 I See Footnote (5) Common Stock 02/20/2014   C   80,871 A (1) 319,688 I See Footnote (5)

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
Series D Preferred Stock	(1)	02/20/2014		C			59,931	(1)	(1)	Common Stock	112,640	$ 0	0	I	See Footnote (2)
Series E Preferred Stock	(1)	02/20/2014		C			53,548	(1)	(1)	Common Stock	144,174	$ 0	0	I	See Footnote (2)
Series F Preferred Stock	(1)	02/20/2014		C			33,612	(1)	(1)	Common Stock	33,612	$ 0	0	I	See Footnote (2)
Series D Preferred Stock	(1)	02/20/2014		C			39,953	(1)	(1)	Common Stock	75,091	$ 0	0	I	See Footnote (3)
Series E Preferred Stock	(1)	02/20/2014		C			35,698	(1)	(1)	Common Stock	96,114	$ 0	0	I	See Footnote (3)
Series F Preferred Stock	(1)	02/20/2014		C			22,408	(1)	(1)	Common Stock	22,408	$ 0	0	I	See Footnote (3)
Series D Preferred Stock	(1)	02/20/2014		C			23,121	(1)	(1)	Common Stock	43,456	$ 0	0	I	See Footnote (4)
Series F Preferred Stock	(1)	02/20/2014		C			975,846	(1)	(1)	Common Stock	975,846	$ 0	0	I	See Footnote (4)
Series G Preferred Stock	(1)	02/20/2014		C			345,168	(1)	(1)	Common Stock	345,168	$ 0	0	I	See Footnote (4)
Series D Preferred Stock	(1)	02/20/2014		C			5,417	(1)	(1)	Common Stock	10,181	$ 0	0	I	See Footnote (5)
Series F Preferred Stock	(1)	02/20/2014		C			228,636	(1)	(1)	Common Stock	228,636	$ 0	0	I	See Footnote (5)
Series G Preferred Stock	(1)	02/20/2014		C			80,871	(1)	(1)	Common Stock	80,871	$ 0	0	I	See Footnote (5)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ARBORETUM VENTURES II LP 303 DETROIT STREET, SUITE 301 ANN ARBOR, MI 48104		X
Arboretum Ventures 1, LLC 303 DETROIT STREET, SUITE 301 ANN ARBOR, MI 48104		X
Arboretum Investment Manager, LLC 303 DETROIT STREET, SUITE 301 ANN ARBOR, MI 48104		X
Arboretum Investment Manager IIa, LLC 303 DETROIT STREET, SUITE 301 ANN ARBOR, MI 48104		X
Arboretum Ventures 1-A, LLC 303 DETROIT STREET, SUITE 301 ANN ARBOR, MI 48104		X
ARBORETUM VENTURES 11A LP 303 DETROIT STREET, SUITE 301 ANN ARBOR, MI 48104		X
Arboretum Investment Manager II, LLC 303 DETROIT STREET, SUITE 301 ANN ARBOR, MI 48104		X
Garfinkle Jan L. 303 DETROIT STREET, SUITE 301 ANN ARBOR, MI 48104		X

Signatures

ARBORETUM VENTURES 1, LLC By: Arboretum Investment Manager, LLC Its: Manager By: Arboretum Ventures, Inc. Its: Manager By: Jan L. Garfinkle, President		02/21/2014
**Signature of Reporting Person		Date
ARBORETUM VENTURES II, L.P. By: Arboretum Investment Manager II, LLC Its: General Partner By: Jan L. Garfinkle, Managing Director		02/21/2014
**Signature of Reporting Person		Date
ARBORETUM INVESTMENT MANAGER, LLC By: Arboretum Ventures, Inc. Its: Manager By: Jan L. Garfinkle, President		02/21/2014
**Signature of Reporting Person		Date
ARBORETUM INVESTMENT MANAGER IIA, LLC By: Arboretum Investment Manager II, LLC Its: Manager By: Jan L. Garfinkle, Managing Director		02/21/2014
**Signature of Reporting Person		Date
ARBORETUM VENTURE 1-A, LLC By: Arboretum Investment Manager, LLC Its: Manager By: Arboretum Ventures, Inc. Its: Manager By: Jan L. Garfinkle, President		02/21/2014
**Signature of Reporting Person		Date
ARBORETUM VENTURES IIA, L.P. By: Arboretum Investment Manager IIa, LLC Its: General Partner By: Arboretum Investment Manager II, LLC Its: Manager By: Jan L. Garfinkle, Managing Director		02/21/2014
**Signature of Reporting Person		Date
ARBORETUM INVESTMENT MANAGER II, LLC By: Jan L. Garfinkle, Managing Director		02/21/2014
**Signature of Reporting Person		Date
ARBORETUM VENTURES, INC. By: Jan L. Garfinkle, President JAN L. GARFINKLE		02/21/2014
**Signature of Reporting Person		Date
JAN L. GARFINKLE By: Jan L. Garfinkle, President		02/21/2014
**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)	Each share of (i) Series D Preferred Stock automatically converted into 1.879505664 shares of Common Stock, (ii) Series E Preferred Stock automatically converted into 2.692436975 shares of Common Stock, (iii) Series F Preferred Stock automatically converted into 1 share of Common Stock, and (iv) Series G Preferred Stock automatically converted into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date.
(2)	These shares are held by Arboretum Ventures 1, LLC ("Ventures 1"). Arboretum Investment Manager, LLC ("AIM") serves as the managing member of Ventures 1. Arboretum Ventures, Inc. ("INC") serves as the Manager of AIM. Jan Garfinkle and Timothy Petersen are the sole shareholders of INC and share the power to vote or dispose of these shares and therefore may be deemed to have voting and investment power with respect to such shares; however, they disclaim beneficial ownership of the shares except to the extent of their pecuniary interests therein. Timothy Petersen is a director of the Issuer and, accordingly, files separate Section 16 reports.
(3)	These shares are held by Arboretum Ventures 1-A, LLC ("Ventures 1-A"). AIM serves as the managing member of Ventures 1-A. INC serves as the Manager of AIM. Jan Garfinkle and Timothy Petersen are the sole shareholders of INC and share the power to vote or dispose of these shares and therefore may be deemed to have voting and investment power with respect to such shares; however, they disclaim beneficial ownership of the shares except to the extent of their pecuniary interests therein. Timothy Petersen is a director of the Issuer and, accordingly, files separate Section 16 reports.
(4)	These shares are held by Arboretum Ventures II, L.P ("Ventures II"). Arboretum Investment Manager II, LLC ("AIM II") serves as the general partner of Ventures II. Jan Garfinkle and Timothy Petersen are the managing members of AIM II and share the power to vote or dispose of these shares and therefore may be deemed to have voting and investment power with respect to such shares; however, they disclaim beneficial ownership of the shares except to the extent of their pecuniary interests therein. Timothy Petersen is a director of the Issuer and, accordingly, files separate Section 16 reports.
(5)	These shares are held by Arboretum Ventures IIa, L.P ("Ventures IIa). AIM II serves as the sole manager of Arboretum Investment Manager IIa, LLC ("AIM IIa"), which serves as the general partner of Ventures IIa. Jan Garfinkle and Timothy Petersen are the managing members of AIM II and share the power to vote or dispose of these shares and therefore may be deemed to have voting and investment power with respect to such shares; however, they disclaim beneficial ownership of the shares except to the extent of their pecuniary interests therein. Timothy Petersen is a director of the Issuer and, accordingly, files separate Section 16 reports.

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