Why This Hedge Fund Added $29 Million to a Cancer Stock Already Up 700%

New York-based Siren disclosed a purchase of 2,486,997 Erasca (NASDAQ:ERAS) shares in its May 14, 2026, SEC filing, an estimated $29.39 million trade based on quarterly average pricing.

What happened

According to a May 14, 2026, SEC filing, Siren added 2,486,997 shares of Erasca (NASDAQ:ERAS) to its portfolio. The estimated transaction value was $29.39 million, based on the average closing price during the first quarter of 2026. The quarter-end value of the Erasca position increased by $149.35 million, a figure that includes both the impact of the additional shares and underlying price appreciation.

What else to know

• The Erasca stake now stands at 5.04% of reported 13F AUM.
• Top holdings after the filing:
  • NASDAQ:SRRK: $532.16 million (14.8% of AUM)
  • NASDAQ:KYMR: $265.43 million (7.4% of AUM)
  • NASDAQ:ERAS: $181.93 million (5.0% of AUM)
  • NASDAQ:EWTX: $139.55 million (3.9% of AUM)
  • NASDAQ:ONC: $138.09 million (3.8% of AUM)
• As of May 13, 2026, Erasca shares were priced at $10.46, up 700% over one year and vastly outperforming the S&P 500, which is instead up about 26%.

Company Overview

Metric	Value
Price (as of market close 2026-05-13)	$10.46
Market Capitalization	$3.17 billion
One-Year Price Change	700%

Company Snapshot

• Erasca develops targeted therapies for RAS/MAPK pathway-driven cancers, with lead assets including ERAS-007 (oral ERK1/2 inhibitor), ERAS-601 (oral SHP2 inhibitor), and ERAS-801 (CNS-penetrant EGFR inhibitor).
• The firm operates a clinical-stage biopharmaceutical model focused on discovering, developing, and commercializing novel oncology therapies; revenue is expected to be generated through future product approvals and commercialization.
• It targets oncologists and healthcare providers treating patients with advanced or metastatic solid tumors, including non-small cell lung cancer, colorectal cancer, and glioblastoma multiforme.

Erasca, Inc. is a biotechnology company specializing in the development of therapies for cancers driven by the RAS/MAPK pathway. Erasca, Inc. develops targeted oncology assets focused on RAS/MAPK pathway-driven cancers, with clinical-stage candidates addressing a range of difficult-to-treat tumors. Erasca is advancing clinical-stage candidates targeting key cancer pathways for patients with difficult-to-treat tumors.

What this transaction means for investors

It seems like Siren believes Erasca’s explosive rally may still be early in the company’s broader clinical story, and there’s reason to understand why. The company just this week reported encouraging early data for ERAS-0015, including “robust” responses in KRAS G12X lung and pancreatic cancers alongside what management described as generally favorable tolerability. Erasca also said dose escalation and monotherapy expansion milestones were completed ahead of schedule, with additional data expected in the first half of 2027.

Importantly, the company appears well-funded enough to pursue aggressive development plans. Erasca finished the first quarter with roughly $409 million in cash and marketable securities after completing a $258.8 million upsized financing in January. Management expects that capital will fund operations into the second half of 2028.

For long-term investors, the opportunity here centers on whether ERAS-0015 can truly emerge as a backbone therapy for RAS-driven cancers, one of oncology’s largest unmet markets. The stock’s massive run reflects rising optimism, but like most clinical-stage biotech stories, future data will ultimately matter far more than momentum.

Jonathan Ponciano has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends BeOne Medicines Ag. The Motley Fool recommends Kymera Therapeutics. The Motley Fool has a disclosure policy.