How We Invest

13F FILER • DAVID ROSEN

Rubric Capital Management

David Rosen — Rubric Capital Management LP

No writing by this manager has been read and indexed yet, so this page carries the filings only. Holdings come straight from the Form 13F-HR on EDGAR.

87

Positions

$10.9B

Reported Value

46.4%

In Top 10

—

Claims Indexed

Largest reported positions

RUBRIC CAPITAL MANAGEMENT LP • CIK 0001687509 • 2026-06-30 • FILED 2026-08-14

WHAT CHANGED THIS QUARTER

In its Q2 2026 13F, filed Aug 14, 2026, Rubric Capital Management reported 87 positions worth $10.9B in US-listed stock. The largest stock position is Talen Energy Corp at 12.7% of the reported book, and the ten largest lines of any type make up 46.4% of it.

It opened 18 new positions, the largest stock positions being Fluor Corp ($262.9M) and Amazon Com Inc ($214.5M), and exited 14, the largest stock exits being Constellation Energy Corp ($199.7M last quarter), Akamai Technologies Inc ($149.3M last quarter) and Telephone & Data Sys Inc ($77.9M last quarter).

Among positions it already held, the biggest increases by share count were Pennymac Finl Svcs Inc New (+3006%), Ardelyx Inc (+771%) and Adma Biologics Inc (+416%), and the biggest cuts were Mercury Genl Corp New (−28%), Edgewell Personal Care Co (−11%) and Ecovyst Inc (−10%).

Largest reported positions, quarter ended 2026-06-30
IssuerValueWeightShares QoQ
TALEN ENERGY CORP$1.4B12.7%—
FTAI AVIATION LTD$811.6M7.5%+17%
VIATRIS INC$542.6M5.0%+2%
TEVA PHARMACEUTICAL INDS LTD$527.7M4.8%+2%
GOLAR LNG LTD$457.5M4.2%—
VISTRA CORP$284.7M2.6%+20%
TRANSALTA CORP$279.8M2.6%+14%
FLUOR CORP$262.9M2.4%New
KINIKSA PHARMACEUTICALS INTL$255.8M2.4%+7%
BGC GROUP INC$254.4M2.3%+2%
ZOOM COMMUNICATIONS INC$238.7M2.2%+176%
GILDAN ACTIVEWEAR INC$232.2M2.1%+222%
ARCUTIS BIOTHERAPEUTICS INC$216.9M2.0%—
AMAZON COM INC$214.5M2.0%New
ROIVANT SCIENCES LTD$212.3M1.9%+20%
ZYMEWORKS INC$183.0M1.7%—
AMCOR PLC$180.4M1.7%+228%
CIMPRESS PLC$178.0M1.6%+7%
AMNEAL PHARMACEUTICALS INC$176.0M1.6%-8%
NURIX THERAPEUTICS INC$175.3M1.6%+192%

20 of 87 positions. $1.9M of the reported value is Section 13(f) debt — convertible notes and the like — which the form covers alongside equities. A 13F covers long US-listed positions at a quarter end only — no shorts, leverage, cash, ordinary bonds or private holdings — and is 45 days old on publication.

NEW POSITIONS

  • Fluor Corp$262.9M · 2.4%
  • Amazon Com Inc$214.5M · 2.0%

EXITS

  • Constellation Energy Corp$199.7M last quarter
  • Akamai Technologies Inc$149.3M last quarter
  • Telephone & Data Sys Inc$77.9M last quarter
  • Protagonist Therapeutics Inc$45.1M last quarter
  • Calavo Growers Inc$36.5M last quarter

QUESTIONS PEOPLE ASK

What are Rubric Capital Management's largest holdings?

OPEN
As of Jun 30, 2026, the three largest stock positions are Talen Energy Corp (12.7%), Ftai Aviation Ltd (7.5%) and Viatris Inc (5.0%), together 25.1% of the reported book.

How big is Rubric Capital Management's 13F portfolio?

OPEN
The Q2 2026 13F, filed Aug 14, 2026, reports 87 positions worth $10.9B. The ten largest make up 46.4% of it.

What did Rubric Capital Management buy and sell in Q2 2026?

OPEN
It opened 18 new positions, the largest stock positions being Fluor Corp ($262.9M) and Amazon Com Inc ($214.5M), and exited 14, the largest stock exits being Constellation Energy Corp ($199.7M last quarter), Akamai Technologies Inc ($149.3M last quarter) and Telephone & Data Sys Inc ($77.9M last quarter). Among positions it already held, the biggest increases by share count were Pennymac Finl Svcs Inc New (+3006%), Ardelyx Inc (+771%) and Adma Biologics Inc (+416%), and the biggest cuts were Mercury Genl Corp New (−28%), Edgewell Personal Care Co (−11%) and Ecovyst Inc (−10%).

When is Rubric Capital Management's next 13F due?

OPEN
The Q3 2026 13F is due Nov 16, 2026. Forty-five days after the quarter ends is November 14, 2026 (Saturday), so the deadline moves to the next business day. David Rosen's filing usually lands close to the deadline.

Filers with overlapping books