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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1501756	Avalanche Biotechnologies Inc.	AAVL	Biological Products, (No Disgnostic Substances) (2836)	205258327

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1614872	W. Thomas Chalberg	C/O Avalanche Biotechnologies, Inc. 1035 O'Brien Drive, Suite A Menlo Park CA 94025	Chief Executive Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2015-05-05	25,000	$30.00	283,988	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	420,000	Indirect	See Footnote
Common Stock	420,000	Indirect	See Footnote
Common Stock	413	Indirect	See Footnote

Footnotes

Transaction made pursuant to a 10b5-1 trading plan adopted by the Reporting Person.
This transaction was executed in multiple trades in prices ranging from $29.20 to $31.00, inclusive. The price reported in Column 4 above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.
The Shares are held directly by Thomas W. Chalberg, as Trustee of the Thomas W. Chalberg 2014 Grantor Retained Annuity Trust under agreement dated April 30, 2014.
The Shares are held directly by the Stefanie R. Chalberg 2014 Grantor Retained Annuity Trust under agreement Dated April 30, 2014.
The Shares are held directly by the 2009 Chalberg Family Trust, Thomas W. Chalberg, Jr. and Stefanie Raue Chalberg, Trustees.