# EDGAR Filing Document

**Accession Number:** 0001627608
**File Stem:** 0001172661-25-002999
**Filing Date:** 2025-8
**Character Count:** 9533
**Document Hash:** 0d39f31601d90e500e966faf3c03ff98
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001172661-25-002999.hdr.sgml**: 20250811

**ACCESSION NUMBER**: 0001172661-25-002999

**CONFORMED SUBMISSION TYPE**: 13F-HR

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250630

**FILED AS OF DATE**: 20250811

**DATE AS OF CHANGE**: 20250811

**EFFECTIVENESS DATE**: 20250811

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Monashee Investment Management LLC
- **CENTRAL INDEX KEY:** 0001627608

**ORGANIZATION NAME:**
- **EIN:** 453324374
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1130

**FILING VALUES:**
- **FORM TYPE:** 13F-HR
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 028-16854
- **FILM NUMBER:** 251201253

**BUSINESS ADDRESS:**
- **STREET 1:** 75 PARK PLAZA
- **STREET 2:** 4TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116
- **BUSINESS PHONE:** 6176710048

**MAIL ADDRESS:**
- **STREET 1:** 75 PARK PLAZA
- **STREET 2:** 4TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02116

### FORM 13F COVER PAGE

**Report for the Calendar Year or Quarter Ended:** 06-30-2025

**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:** Monashee Investment Management LLC<br>**Address:** 75 Park Plaza<br>4th Floor<br>Boston, MA 02116

**Form 13F File Number:** 028-16854

**CRD Number (if applicable):** 000163148

**SEC File Number (if applicable):** 801-79936

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:** Jeff Muller<br>**Title:** COO/CCO<br>**Phone:** 617-671-0048

**Signature, Place, and Date of Signing:**

/s/ Jeff Muller  Boston, MA  08-11-2025<br>[Signature]  [City, State]  [Date]

**Report Type (Check only one.):**

[x] **13F HOLDINGS REPORT.** (Check here if all holdings of this reporting manager are reported in this report.)

[ ] **13F NOTICE.** (Check here if no holdings are reported 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).)

### Form 13F Summary Page

**Report Summary:**

**Number of Other Included Managers:** 0

**Form 13F Information Table Entry Total:** 57

**Form 13F Information Table Value Total:** $275906191

      (round to nearest dollar)

**List of Other Included Managers:**

Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.

[If there are no entries in this list, state “NONE” and omit the column headings and list entries.]

**NONE**

### FORM 13F INFORMATION TABLE

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| NAME OF ISSUER | TITLE OF CLASS | CUSIP | FIGI | VALUE (x$1000) | SHRS OR PRN AMT | SH/PRN | PUT/CALL | INVESTMENT DISCRETION | OTHER MANAGER | VOTING AUTHORITY | VOTING AUTHORITY | VOTING AUTHORITY |
| NAME OF ISSUER | TITLE OF CLASS | CUSIP | FIGI | VALUE (x$1000) | SHRS OR PRN AMT | SH/PRN | PUT/CALL | INVESTMENT DISCRETION | OTHER MANAGER | SOLE | SHARED | NONE |
| ADT INC DEL | COM | 00090Q103 |  | 5085439 | 600406 | SH |  | SOLE |  | 600406 | 0 | 0 |
| AIRO GROUP HLDGS INC | COM | 009422106 |  | 1083150 | 45000 | SH | Put | SOLE |  | 45000 | 0 | 0 |
| AIRSCULPT TECHNOLOGIES INC | COM | 009496100 |  | 1185949 | 245538 | SH |  | SOLE |  | 245538 | 0 | 0 |
| ARCHER AVIATION INC | COM CL A | 03945R102 |  | 8680000 | 800000 | SH |  | SOLE |  | 800000 | 0 | 0 |
| AURORA INNOVATION INC | CLASS A COM | 051774107 |  | 2620000 | 500000 | SH | Put | SOLE |  | 500000 | 0 | 0 |
| BIODESIX INC | COM | 09075X108 |  | 564400 | 2000000 | SH |  | SOLE |  | 2000000 | 0 | 0 |
| BRIDGEBIO PHARMA INC | COM | 10806X102 |  | 11010900 | 255000 | SH |  | SOLE |  | 255000 | 0 | 0 |
| BRIGHTSPRING HEALTH SVCS INC | COM | 10950A106 |  | 3302600 | 140000 | SH | Put | SOLE |  | 140000 | 0 | 0 |
| BROWN  BROWN INC | COM | 115236101 |  | 16630500 | 150000 | SH | Put | SOLE |  | 150000 | 0 | 0 |
| CANTOR EQUITY PARTNERS II IN | CL A ORD SHS | G1827P106 |  | 1654500 | 150000 | SH |  | SOLE |  | 150000 | 0 | 0 |
| CANTOR EQUITY PARTNERS III I | SHS CL A | G1828A108 |  | 2110000 | 200000 | SH |  | SOLE |  | 200000 | 0 | 0 |
| CARIS LIFE SCIENCES INC | COM | 142152107 |  | 1736800 | 65000 | SH | Put | SOLE |  | 65000 | 0 | 0 |
| CCC INTELLIGENT SOLUTIONS HL | COM | 12510Q100 |  | 3058250 | 325000 | SH |  | SOLE |  | 325000 | 0 | 0 |
| CENTURI HOLDINGS INC | COM SHS | 155923105 |  | 1795200 | 80000 | SH | Put | SOLE |  | 80000 | 0 | 0 |
| CHEWY INC | CL A | 16679L109 |  | 8524000 | 200000 | SH |  | SOLE |  | 200000 | 0 | 0 |
| CHIME FINL INC | COM SHS CL A | 16935C109 |  | 4831400 | 140000 | SH | Put | SOLE |  | 140000 | 0 | 0 |
| CIPHER MINING INC | COM | 17253J106 |  | 5258000 | 1100000 | SH | Put | SOLE |  | 1100000 | 0 | 0 |
| CIPHER MINING INC | NOTE 1.750% 5/1 | 17253JAA4 |  | 2578300 | 2000000 | PRN |  | SOLE |  | 2000000 | 0 | 0 |
| COMPASS THERAPEUTICS INC | COM | 20454B104 |  | 429000 | 165000 | SH |  | SOLE |  | 165000 | 0 | 0 |
| CORE SCIENTIFIC INC NEW | COM | 21874A106 |  | 11949000 | 700000 | SH |  | SOLE |  | 700000 | 0 | 0 |
| ELI LILLY  CO | COM | 532457108 |  | 15590600 | 20000 | SH |  | SOLE |  | 20000 | 0 | 0 |
| ETORO GROUP LTD | SHS CL A | G32089107 |  | 5160725 | 77500 | SH |  | SOLE |  | 77500 | 0 | 0 |
| GALAXY DIGITAL INC. | CL A | 36317J209 |  | 10293000 | 470000 | SH |  | SOLE |  | 470000 | 0 | 0 |
| GOSSAMER BIO INC | NOTE 5.000% 6/0 | 38341PAA0 |  | 526530 | 1000000 | PRN |  | SOLE |  | 1000000 | 0 | 0 |
| HINGE HEALTH INC | CL A | 433313103 |  | 7245000 | 140000 | SH | Put | SOLE |  | 140000 | 0 | 0 |
| INSMED INC | COM PAR $.01 | 457669307 |  | 4025600 | 40000 | SH |  | SOLE |  | 40000 | 0 | 0 |
| JEFFERSON CAPITAL INC | COM | 47248R103 |  | 184500 | 10000 | SH |  | SOLE |  | 10000 | 0 | 0 |
| KARAT PACKAGING INC | COM | 48563L101 |  | 1548800 | 55000 | SH |  | SOLE |  | 55000 | 0 | 0 |
| KAROOOOO LTD | ORD SHS | Y4600W108 |  | 2204100 | 45000 | SH |  | SOLE |  | 45000 | 0 | 0 |
| KRATOS DEFENSE  SEC SOLUTIO | COM NEW | 50077B207 |  | 11612500 | 250000 | SH |  | SOLE |  | 250000 | 0 | 0 |
| KYMERA THERAPEUTICS INC | COM | 501575104 |  | 3709400 | 85000 | SH |  | SOLE |  | 85000 | 0 | 0 |
| LATAM AIRLINES GROUP SA | SPONSORED ADR | 51817R205 |  | 3251200 | 80000 | SH |  | SOLE |  | 80000 | 0 | 0 |
| LIFE TIME GROUP HOLDINGS INC | COMMON STOCK | 53190C102 |  | 2578050 | 85000 | SH |  | SOLE |  | 85000 | 0 | 0 |
| MAKEMYTRIP LIMITED MAURITIUS | SHS | V5633W109 |  | 5146050 | 52500 | SH |  | SOLE |  | 52500 | 0 | 0 |
| MAREX GROUP PLC | ORD | G5S37H101 |  | 3552300 | 90000 | SH |  | SOLE |  | 90000 | 0 | 0 |
| NEBIUS GROUP N.V. | SHS CLASS A | N97284108 |  | 3319800 | 60000 | SH |  | SOLE |  | 60000 | 0 | 0 |
| OKLO INC | COM CL A | 02156V109 |  | 5039100 | 90000 | SH |  | SOLE |  | 90000 | 0 | 0 |
| OMADA HEALTH INC | COM | 68170A108 |  | 5490000 | 300000 | SH |  | SOLE |  | 300000 | 0 | 0 |
| ONDAS HLDGS INC | COM NEW | 68236H204 |  | 1920000 | 1000000 | SH |  | SOLE |  | 1000000 | 0 | 0 |
| QXO INC | COM NEW | 82846H405 |  | 17232000 | 800000 | SH | Put | SOLE |  | 800000 | 0 | 0 |
| QXO INC | 5.50 DEP PFD | 82846H504 |  | 4649250 | 75000 | SH |  | SOLE |  | 75000 | 0 | 0 |
| REDWIRE CORPORATION | COM | 75776W103 |  | 4075000 | 250000 | SH |  | SOLE |  | 250000 | 0 | 0 |
| RIOT PLATFORMS INC | COM | 767292105 |  | 6780000 | 600000 | SH |  | SOLE |  | 600000 | 0 | 0 |
| RUBRIK INC. | CL A | 781154109 |  | 2239750 | 25000 | SH | Put | SOLE |  | 25000 | 0 | 0 |
| SANDISK CORP | COM | 80004C200 |  | 999197 | 22033 | SH | Put | SOLE |  | 22033 | 0 | 0 |
| SERVICETITAN INC | SHS CL A | 81764X103 |  | 10182100 | 95000 | SH | Put | SOLE |  | 95000 | 0 | 0 |
| SITIME CORP | COM | 82982T106 |  | 1065400 | 5000 | SH |  | SOLE |  | 5000 | 0 | 0 |
| SLIDE INS HLDGS INC | COM | 831349105 |  | 3032400 | 140000 | SH | Put | SOLE |  | 140000 | 0 | 0 |
| SOLID BIOSCIENCES INC | COM NEW | 83422E204 |  | 10543550 | 2165000 | SH |  | SOLE |  | 2165000 | 0 | 0 |
| STRUCTURE THERAPEUTICS INC | SPONSORED ADS | 86366E106 |  | 8918200 | 430000 | SH |  | SOLE |  | 430000 | 0 | 0 |
| SUPER MICRO COMPUTER INC | COM NEW | 86800U302 |  | 2450500 | 50000 | SH | Put | SOLE |  | 50000 | 0 | 0 |
| SURROZEN INC | *W EXP 08/01/203 | 86889P117 |  | 545 | 30129 | SH |  | SOLE |  | 30129 | 0 | 0 |
| TAT TECHNOLOGIES LTD | ORD NEW | M8740S227 |  | 975356 | 31937 | SH |  | SOLE |  | 31937 | 0 | 0 |
| TEMPUS AI INC | CL A | 88023B103 |  | 3177000 | 50000 | SH | Put | SOLE |  | 50000 | 0 | 0 |
| T-MOBILE US INC | COM | 872590104 |  | 5956500 | 25000 | SH |  | SOLE |  | 25000 | 0 | 0 |
| VERTEX INC | CL A | 92538J106 |  | 4593550 | 130000 | SH |  | SOLE |  | 130000 | 0 | 0 |
| VOYAGER TECHNOLOGIES INC | COM CL A | 92892B103 |  | 2551250 | 65000 | SH | Put | SOLE |  | 65000 | 0 | 0 |

---