The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE

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Report for the Calendar Year or Quarter Ended: 03-31-2019
Check here if Amendment    Amendment Number:
This Amendment (Check only one.):    is a restatement.
   adds new holdings entries.
Institutional Investment Manager Filing this Report:
Name: SVLSF IV, LLC
Address: ONE BOSTON PLACE
201 WASHINGTON STREET, SUITE 3900
BOSTON, MA  02108
Form 13F File Number: 028-16272

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:
Name: Brent M. Faduski
Title: Officer
Phone: (617) 367-8100
Signature, Place, and Date of Signing:
/s/ Brent M. Faduski BostonMA 05-15-2019
[Signature] [City, State] [Date]
The filing of this report shall not be deemed an admission, for purposes of Section 13(f), 13(d), 13(g), or 16(a) under the Securities Exchange Act of 1934, as amended, and the rules thereunder, or for any other purpose, that the Reporting Manager or any other person (including Other Managers or Other Included Managers named herein) is the beneficial owner of any securities. SV Health Investors, LLC (formerly SV Life Sciences Advisers, LLC), a Delaware limited liability company ("Investors"), is an institutional investment manager subject to Section 13(f) of the Securities Exchange Act of 1934 and the rules promulgated thereunder. SV Life Sciences Fund IV, L.P. ("SVLS IV LP") and SV Life Sciences Fund VI Strategic Partners, L.P. ("Strategic Partners" and together with SVLS IV LP, the "Funds"), which are each Delaware limited partnerships, directly own certain security positions reported by Investors, which is the investment adviser of the Funds. SV Life Sciences Fund IV (GP), L.P., a Delaware limited partnership ("SVLS IV GP") is the general partner of the Funds and SVLSF IV, LLC, a Delaware limited liability company is the general partner of SVLS IV GP. Certain of the security positions reported by Investors are also being reported by SVLS IV GP and SVLSF IV, LLC. Each of SVLS IV GP, SVLSF IV, LLC and Investors may be deemed to share voting power and control over the shares held by the Funds. Each of SVLS IV GP, SVLSF IV, LLC and Investors disclaim beneficial ownership of the shares held by the Funds except to the extent of any pecuniary interest therein.
Report Type (Check only one.):
   13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)
X 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)
   13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)
List of Other Managers Reporting for this Manager:
[If there are no entries in this list, omit this section.]
Form 13F File Number Name
028-16271 SV Health Investors, LLC