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Rubric Capital Management LP — 13F Holdings & Portfolio

CIK 1687509 · latest 13F-HR filed 2026-08-14

Backtest portfolio

Rubric Capital Management LP manages $10.90B in 13F-reported U.S. long-equity assets across 87 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are TLN (12.70%), FTAI (7.45%), VTRS (4.98%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 18 new positions and exited 13; 52 existing positions rose in reported value and 14 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM
$10.90B

Long-equity book

Holdings
87

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+18 / −13 / ↑52 / ↓14

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
TLN12.7% · 0%FTAI7.4% · +16%VTRS5.0% · +2%TEVA4.8% · +2%GLNG4.2% · 0%VST2.6% · +20%TAC2.6% · +14%FLR2.4% · newKNSA2.3% · +7%BGC2.3% · +2%ZM2.2% · +176%GIL2.1% · +222%ARQT2.0% · 0%AMZN2.0% · newROIV1.9% · +20%ZYME1.7% · 0%AMCR1.7% · +228%CMPR1.6% · +7%AMRX1.6% · -8%NRIX1.6% · +192%MCY1.5% · -28%PFSI1.4% · +3006%IART1.3% · 0%DK1.3% · 0%LBTYA1.2% · 0%MGTX1.1% · +30%GEO1.1% · +10%LILAK1.1% · +2%SDGR1.0% · +7%ECVT0.9% · -10%LBTYK0.9% · 0%COMP0.9% · +119%NWL0.9% · +5%EPC0.9% · -11%CXW0.8% · +38%ARDX0.8% · +771%ENOV0.7% · +59%ADMA0.7% · +416%MNKD0.7% · +397%DRVN0.7% · +77%OPK0.7% · 0%AVO0.6% · +246%ADEA0.6% · -50%RNW0.6% · 0%SSYS0.6% · 0%SPRY0.6% · +7%ANDE0.6% · +17%PRMB0.6% · -4%SON0.6% · newSTUB0.6% · newGLXY0.6% · newVG0.6% · +261%ESTA0.5% · newQDEL0.5% · 0%ALVO0.5% · newTH0.5% · +18%DNOW0.5% · +208%PRTA0.4% · 0%TRVI0.4% · -32%COLL0.4% · 0%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 46.4%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Mar 30, 2026.

Assets Under Management
$9.58B
Discretionary
$9.58B
Employees
15
Accounts
9
Address
155 EAST 44TH STREET
SUITE 1630
NEW YORK, NY 10017
Phone
(212) 418-1888
Website
Name Title / Status Ownership Type
ROSEN, DAVID, EFRAIM ControlLIMITED PARTNER
since Mar 2016
75% or moreIndividual
RUBRIC CAPITAL MANAGEMENT GP LLC ControlGENERAL PARTNER
since Mar 2016
Less than 5%Domestic Entity
KLEINHAUS, BRIAN, WOLFGENERAL COUNSEL AND CHIEF COMPLIANCE OFFICER
since Mar 2018
Less than 5%Individual
KOSSAKOWSKI, MARGARETCHIEF FINANCIAL OFFICER
since Jan 2019
Less than 5%Individual
NACHMANI, CHANAN, MICHAELCHIEF OPERATING OFFICER
since Jul 2016
Less than 5%Individual
ROSEN, DAVID, EFRAIM Control
Indirect owner via RUBRIC CAPITAL MANAGEMENT GP LLC
MANAGING MEMBER
since Mar 2016
75% or moreIndividual
Ownership & leadership changes · 3 filings with changes since Sep 9, 2016

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Mar 25, 2025 filing
  • ChangedKLEINHAUS, BRIAN, WOLF · title CHIEF COMPLIANCE OFFICER → GENERAL COUNSEL AND CHIEF COMPLIANCE OFFICER
Mar 29, 2019 filing
  • AddedKOSSAKOWSKI, MARGARET · CHIEF FINANCIAL OFFICER · Less than 5%
Mar 12, 2018 filing
  • AddedKLEINHAUS, BRIAN, WOLF · CHIEF COMPLIANCE OFFICER · Less than 5%
  • ChangedNACHMANI, CHANAN, MICHAEL · title CHIEF OPERATING OFFICER/ CHIEF COMPLIANCE OFFICER → CHIEF OPERATING OFFICER
Sep 9, 2016 filing (earliest on record)
  • ListedNACHMANI, CHANAN, MICHAEL · CHIEF OPERATING OFFICER/ CHIEF COMPLIANCE OFFICER · Less than 5%
  • ListedROSEN, DAVID, EFRAIM · LIMITED PARTNER · 75% or more · control person
  • ListedROSEN, DAVID, EFRAIM · MANAGING MEMBER · 75% or more · indirect via RUBRIC CAPITAL MANAGEMENT GP LLC · control person
  • ListedRUBRIC CAPITAL MANAGEMENT GP LLC · GENERAL PARTNER · Less than 5% · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

Show all 52 →

Top Trims

Show all 14 →

New Positions

Show all 18 →

Exited Positions

Show all 13 →

Rubric Capital Management LP Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 TALEN ENERGY CORP TLN 87422Q109 $1.38B 12.70% 3,602,171 SH
2 FTAI AVIATION LTD FTAI G3730V105 $811.6M 7.45% 3,000,000 SH
3 VIATRIS INC VTRS 92556V106 $542.6M 4.98% 34,168,743 SH
4 TEVA PHARMACEUTICAL INDS LTD TEVA 881624209 $527.7M 4.84% 15,575,000 SH
5 GOLAR LNG LTD GLNG G9456A100 $457.5M 4.20% 9,178,978 SH
6 VISTRA CORP VST 92840M102 $284.7M 2.61% 1,794,953 SH
7 TRANSALTA CORP TAC 89346D107 $279.8M 2.57% 20,232,011 SH
8 FLUOR CORP FLR 343412102 $262.9M 2.41% 5,017,248 SH
9 KINIKSA PHARMACEUTICALS INTL KNSA G52694109 $255.8M 2.35% 3,999,800 SH
10 BGC GROUP INC BGC 088929104 $254.4M 2.33% 23,800,000 SH
11 ZOOM COMMUNICATIONS INC ZM 98980L101 $238.7M 2.19% 2,766,009 SH
12 GILDAN ACTIVEWEAR INC GIL 375916103 $232.2M 2.13% 4,500,000 SH
13 ARCUTIS BIOTHERAPEUTICS INC ARQT 03969K108 $216.9M 1.99% 8,271,577 SH
14 AMAZON COM INC AMZN 023135106 $214.5M 1.97% 900,000 SH
15 ROIVANT SCIENCES LTD ROIV G76279101 $212.3M 1.95% 6,000,000 SH
16 ZYMEWORKS INC ZYME 98985Y108 $183.0M 1.68% 7,000,000 SH
17 AMCOR PLC AMCR G0250X149 $180.4M 1.66% 4,162,030 SH
18 CIMPRESS PLC CMPR G2143T103 $178.0M 1.63% 1,750,000 SH
19 AMNEAL PHARMACEUTICALS INC AMRX 03168L105 $176.0M 1.61% 10,168,660 SH
20 NURIX THERAPEUTICS INC NRIX 67080M103 $175.3M 1.61% 7,227,778 SH
21 MERCURY GENL CORP NEW MCY 589400100 $164.3M 1.51% 1,541,440 SH
22 PENNYMAC FINL SVCS INC NEW PFSI 70932M107 $148.1M 1.36% 1,700,000 SH
23 INTEGRA LIFESCIENCES HLDGS C IART 457985208 $139.3M 1.28% 7,753,934 SH
24 DELEK US HLDGS INC NEW DK 24665A103 $136.5M 1.25% 2,687,449 SH
25 LIBERTY GLOBAL LTD LBTYA G61188101 $133.6M 1.23% 11,752,855 SH
26 MEIRAGTX HLDGS PLC MGTX G59665102 $122.9M 1.13% 9,100,000 SH
27 GEO GROUP INC GEO 36162J106 $122.1M 1.12% 4,131,219 SH
28 LIBERTY LATIN AMERICA LTD LILAK G9001E128 $121.9M 1.12% 15,645,430 SH
29 SCHRODINGER INC SDGR 80810D103 $104.0M 0.95% 6,400,000 SH
30 ECOVYST INC ECVT 27923Q109 $102.2M 0.94% 8,211,888 SH
31 LIBERTY GLOBAL LTD LBTYK G61188127 $101.9M 0.93% 9,259,361 SH
32 COMPASS INC COMP 20464U100 $101.3M 0.93% 8,218,394 SH
33 NEWELL BRANDS INC NWL 651229106 $98.2M 0.90% 16,000,000 SH
34 EDGEWELL PERSONAL CARE CO EPC 28035Q102 $95.2M 0.87% 3,544,465 SH
35 CORECIVIC INC CXW 21871N101 $86.5M 0.79% 2,847,436 SH
36 ARDELYX INC ARDX 039697107 $82.6M 0.76% 16,202,700 SH
37 ENOVIS CORPORATION ENOV 194014502 $80.7M 0.74% 3,900,000 SH
38 ADMA BIOLOGICS INC ADMA 000899104 $78.2M 0.72% 9,339,414 SH
39 MANNKIND CORP MNKD 56400P706 $76.7M 0.70% 18,000,000 SH
40 DRIVEN BRANDS HLDGS INC DRVN 26210V102 $73.9M 0.68% 5,300,613 SH
41 OPKO HEALTH INC OPK 68375N103 $71.7M 0.66% 47,791,243 SH
42 MISSION PRODUCE INC AVO 60510V108 $70.5M 0.65% 5,981,953 SH
43 ADEIA INC ADEA 00676P107 $70.0M 0.64% 2,126,633 SH
44 RENEW ENERGY GLOBAL PLC RNW G7500M104 $68.8M 0.63% 11,000,000 SH
45 STRATASYS LTD SSYS M85548101 $68.5M 0.63% 8,000,000 SH
46 ARS PHARMACEUTICALS INC SPRY 82835W108 $68.4M 0.63% 8,540,861 SH
47 ANDERSONS INC ANDE 034164103 $68.4M 0.63% 999,559 SH
48 PRIMO BRANDS CORPORATION PRMB 741623102 $65.3M 0.60% 2,672,231 SH
49 SONOCO PRODS CO SON 835495102 $64.4M 0.59% 1,143,562 SH
50 STUBHUB HLDGS INC STUB 86384P109 $64.3M 0.59% 5,000,000 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $10.90B 87 0001104659-26-097098
2026-03-31 2026-05-15 $9.44B 83 0001104659-26-062466
2025-12-31 2026-02-13 $8.36B 76 0001104659-26-015172
2025-09-30 2025-11-14 $8.86B 72 0001104659-25-112706
Filer Information
Address
155 EAST 44TH ST, SUITE 1630
NEW YORK, NY 10017
Phone
(212) 418-1881
Filing Manager
Rubric Capital Management LP
NEW YORK, NY
Signatory
Michael Nachmani
Chief Operating Officer