| Item 1. | |
| (a) | Name of issuer:
Aclaris Therapeutics, Inc. |
| (b) | Address of issuer's principal executive offices:
701 Lee Road, Suite 103, Wayne, PA 19087 |
| Item 2. | |
| (a) | Name of person filing:
Vivo Opportunity Fund Holdings, L.P. and its General Partner Vivo Opportunity, LLC
Vivo Opportunity Cayman Fund, L.P. and its General Partner Vivo Opportunity Cayman, LLC |
| (b) | Address or principal business office or, if none, residence:
192 Lytton Avenue, Palo Alto, CA 94301 |
| (c) | Citizenship:
Vivo Opportunity Fund Holdings, L.P. is a Delaware limited partnership.
Vivo Opportunity, LLC is a Delaware limited liability company.
Vivo Opportunity Cayman Fund, L.P. is a Cayman Islands limited partnership.
Vivo Opportunity Cayman, LLC is a Cayman Islands limited liability company. |
| (d) | Title of class of securities:
Common Stock, $0.00001 par value |
| (e) | CUSIP No.:
|
| Item 3. | If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: |
| (a) |  Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
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| (b) | Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
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| (c) | Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
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| (d) | Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
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| (e) | An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
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| (f) | An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
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| (g) | A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
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| (h) | A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
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| (i) | A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
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| (j) | A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
|
| (k) | Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
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| | |
| Item 4. | Ownership |
| (a) | Amount beneficially owned:
Vivo Opportunity, LLC beneficially owns 5,966,370 shares of Common Stock. The securities are held of record by Vivo Opportunity Fund Holdings, L.P. Vivo Opportunity, LLC is the general partner of Vivo Opportunity Fund Holdings, L.P.
Vivo Opportunity Cayman, LLC beneficially owns 700,296 shares of Common Stock. The securities are held of record by Vivo Opportunity Cayman Fund, L.P. Vivo Opportunity Cayman, LLC is the general partner of Vivo Opportunity Cayman Fund, L.P. |
| (b) | Percent of class:
Vivo Opportunity Fund Holdings, L.P.: 4.3%
Vivo Opportunity, LLC: 4.3%
Vivo Opportunity Cayman Fund, L.P.: 0.5%
Vivo Opportunity Cayman, LLC.: 0.5% |
| (c) | Number of shares as to which the person has:
|
| | (i) Sole power to vote or to direct the vote:
Vivo Opportunity Fund Holdings, L.P.: 5,966,370 shares
Vivo Opportunity, LLC: 5,966,370 shares
Vivo Opportunity Cayman Fund, L.P.: 700,296 shares
Vivo Opportunity Cayman, LLC: 700,296 shares
|
| | (ii) Shared power to vote or to direct the vote:
0
|
| | (iii) Sole power to dispose or to direct the disposition of:
Vivo Opportunity Fund Holdings, L.P.: 5,966,370 shares
Vivo Opportunity, LLC: 5,966,370 shares
Vivo Opportunity Cayman Fund, L.P.: 700,296 shares
Vivo Opportunity Cayman, LLC: 700,296 shares
|
| | (iv) Shared power to dispose or to direct the disposition of:
0
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| Item 5. | Ownership of 5 Percent or Less of a Class. |
| | 
Ownership of 5 percent or less of a class
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| Item 6. | Ownership of more than 5 Percent on Behalf of Another Person. |
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Not Applicable
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| Item 7. | Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person. |
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Not Applicable
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| Item 8. | Identification and Classification of Members of the Group. |
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Not Applicable
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