Ownership Submission
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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(Print or Type Responses)
1. Name and Address of Reporting Person *
ARBORETUM VENTURES II LP
  2. Issuer Name and Ticker or Trading Symbol
Inogen Inc [INGN]
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)
09/15/2014
(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 09/15/2014   S(1)   1,311 D $ 21.4505 (2) 299,547 I see footnote (3)
Common Stock 09/15/2014   S(1)   874 D $ 21.4505 (2) 199,693 I see footnote (4)
Common Stock 09/15/2014   S(1)   5,928 D $ 21.4505 (2) 1,358,542 I see footnote (5)
Common Stock 09/15/2014   S(1)   1,387 D $ 21.4505 (2) 318,301 I see footnote (6)
Common Stock 09/16/2014   S(1)   897 D $ 21.1615 (7) 298,650 I see footnote (3)
Common Stock 09/16/2014   S(1)   598 D $ 21.1615 (7) 199,095 I see footnote (4)
Common Stock 09/16/2014   S(1)   4,056 D $ 21.1615 (7) 1,354,486 I see footnote (5)
Common Stock 09/16/2014   S(1)   949 D $ 21.1615 (7) 317,352 I see footnote (6)
Common Stock 09/17/2014   S(1)   5,401 D $ 21.7238 (8) 293,249 I see footnote (3)
Common Stock 09/17/2014   S(1)   3,600 D $ 21.7238 (8) 195,495 I see footnote (4)
Common Stock 09/17/2014   S(1)   24,420 D $ 21.7238 (8) 1,330,066 I see footnote (5)
Common Stock 09/17/2014   S(1)   5,714 D $ 21.7238 (8) 311,638 I see footnote (6)

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
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

 /s/ Marcy Marshall as attorney-in-fact   09/17/2014
**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) The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 5, 2014.
(2) Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $21.00 to $22.600 per share. Each Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
(3) 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.
(4) 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.
(5) 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.
(6) 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.
(7) Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $21.00 to $21.350 per share. Each Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
(8) Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $21.3450 to $22.2500 per share. Each Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.

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