$KPTI

Karyopharm Therapeutics Inc.

Insider trades

No enriched coverage for $KPTI in the last 7 days.

$1K
Poulton Stuart
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Karyopharm Therapeutics Stock Tanks 68%

Karyopharm Therapeutics Inc. (KPTI) shares fell about 68% after the company reported topline results from its Phase 3 XPORT-EC-042 trial. The trial did not meet its primary endpoint of progression-free survival. The stock dropped 68.17% to $2.2350 on Nasdaq from $7.01 prior close.

Karyopharm's Phase 3 Endometrial Cancer Trial Misses Endpoint; Stock Slides

Karyopharm Therapeutics (KPTI) reported topline results from its Phase 3 XPORT-EC-042 trial of selinexor as maintenance therapy in TP53 wild-type advanced or recurrent endometrial cancer. The trial missed the primary endpoint for progression-free survival, though median PFS was 12.75 months vs 7.43 months with placebo in 236 patients. No new safety signals were reported; full data planned for a medical meeting.

Why is Karyopharm Therapeutics stock collapsing over 60% today?

Karyopharm Therapeutics shares fell about 67% to $2.29 after its Phase 3 XPORT-EC-042 endometrial cancer trial missed its primary goal, with no statistically significant progression-free survival improvement versus placebo. Analysts downgraded and cut price targets (e.g., Baird $15 to $3, H.C. Wainwright $13 to $3). Karyopharm said it will scale back endometrial plans and focus on myelofibrosis and multiple myeloma.

KPTI sentiment & insider activity

Recent KPTI coverage spans financial news, market movers and earnings.

In the last 30 days, KPTI insiders filed 1 SEC Form 4 transaction — no purchases and 1 sale ($1K). The most active reporter was Poulton Stuart, EVP, Chief Development Officer, with 1 filing.

What's driving KPTI

  • Trial failure likely drives sharp de-risking of the lead program and raises probability of future financing or strategy changes.

    rttnews.com · Jul 31, 2026

  • Endpoint miss with a non-significant but favorable PFS trend likely pressures near-term sentiment and valuation, while longer follow-up and other milestones keep optionality alive.

    rttnews.com · Jul 31, 2026

  • Trial failure and pipeline devaluation dominate near-term valuation, while an August 2026 supplemental NDA for selinexor plus ruxolitinib offers only partial offset.

    investing.com · Jul 31, 2026

  • Regulatory-pathway milestone increases probability of an accelerated approval decision and near-term valuation sensitivity to FDA review progress.

    investors.karyopharm.com · Jul 30, 2026

  • Retention cash awards and potential clawback terms are a modest, mostly balance-sheet and governance signal rather than an operational catalyst.

    SEC EDGAR 8-K · Jul 17, 2026

alphai scores every news story that mentions KPTI with an AI model for sentiment and relevance, and aggregates insider trades from Karyopharm Therapeutics Inc.'s SEC EDGAR Form 4 filings. Figures refresh continuously.

News on $KPTI

Score
$KPTIHighAI 9/10

Karyopharm Therapeutics Stock Tanks 68%

Karyopharm Therapeutics Inc. (KPTI) shares fell about 68% after the company reported topline results from its Phase 3 XPORT-EC-042 trial. The trial did not meet its primary endpoint of progression-free survival. The stock dropped 68.17% to $2.2350 on Nasdaq from $7.01 prior close.

$KPTIMed

Karyopharm's Phase 3 Endometrial Cancer Trial Misses Endpoint; Stock Slides

Karyopharm Therapeutics (KPTI) reported topline results from its Phase 3 XPORT-EC-042 trial of selinexor as maintenance therapy in TP53 wild-type advanced or recurrent endometrial cancer. The trial missed the primary endpoint for progression-free survival, though median PFS was 12.75 months vs 7.43 months with placebo in 236 patients. No new safety signals were reported; full data planned for a medical meeting.

$KPTIHighAI 9/10

Why is Karyopharm Therapeutics stock collapsing over 60% today?

Karyopharm Therapeutics shares fell about 67% to $2.29 after its Phase 3 XPORT-EC-042 endometrial cancer trial missed its primary goal, with no statistically significant progression-free survival improvement versus placebo. Analysts downgraded and cut price targets (e.g., Baird $15 to $3, H.C. Wainwright $13 to $3). Karyopharm said it will scale back endometrial plans and focus on myelofibrosis and multiple myeloma.

Karyopharm Plans to Submit sNDA for Selinexor Plus Ruxolitinib in Myelofibrosis Under Accelerated Approval Pathway

– Company Plans to Submit sNDA in August 2026 and Will Request Priority Review – – Following FDA Engagements, Company Plans to Submit sNDA under Accelerated Approval Based Upon Compelling SVR35 Data and Preliminary Overall Survival Data Observed at the Time of the Topline Results – – Company Plans to Use Long-Term Overall Survival Data from the Ongoing Phase 3 SENTRY Trial to Verify Clinical Benefit – – If Approved, Selinexor in Combination with Ruxolitinib has the Potential to Become the...

$KPTILow

Karyopharm Therapeutics Inc. (KPTI): Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Karyopharm Therapeutics Inc. (KPTI) filed an SEC Form 8-K — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers. 8-K false 0001503802 0001503802 2026-07-13 2026-07-13 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 13, 20

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