BlackRock, Inc. KPTI — KARYOPHARM THERAPEUTICS INC

Ownership history in BlackRock, Inc.  ·  8 quarters on record

AI Ownership Summary

BlackRock, Inc. reported KARYOPHARM THERAPEUTICS INC (KPTI) in 8 quarterly 13F filings from 2024 Q3 through 2026 Q2. The latest visible filing shows KPTI at 0.00% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings.

What this KPTI ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was BlackRock, Inc.'s position in KARYOPHARM THERAPEUTICS INC, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2026 Q2

KPTI was reported at 0.00% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.0% in 2026 Q2

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2024 Q3 to 2026 Q2

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

KPTI stock page BlackRock, Inc. fund profile BlackRock, Inc. full holdings
How BlackRock, Inc. held KPTI — position size vs. price
% of Fund (quarterly)    KPTI price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 8 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q2 ADDED — — — 1,418,799 +1,173,900 +479.3% 0.00% $13.9M 2026-08-07 $2.12
2026 Q1 REDUCED — — — 244,899 -2,659 -1.1% 0.00% $1.4M 2026-05-13 $8.85
2025 Q4 ADDED — — — 247,558 +15,607 +6.7% 0.00% $1.8M 2026-02-12 $8.94
2025 Q3 REDUCED — — — 231,951 -4,690 -2.0% 0.00% $1.5M 2025-11-12 $5.59
2025 Q2 REDUCED — — — 236,641 -6,101 -2.5% 0.00% $1.0M 2025-08-12 $4.02
2025 Q1 REDUCED 93.6% +15.2% ❌ 242,742 -3,526,133 -93.6% 0.00% $908K 2025-05-02 $7.36
2024 Q4 ADDED — — — 3,768,875 +130,497 +3.6% 0.00% $2.5M 2025-02-07 $9.47
2024 Q3 INITIATED — — — 3,638,378 — — 0.00% $3.0M 2024-11-13 $12.99

🏢 Other funds also holding KPTI

As of 2026 Q2 — sorted by position size

Kalehua Capital Management LLC 4.8% ACORN CAPITAL ADVISORS, LLC 4.05% Catalio Capital Management, LP 1.73% Avidity Partners Management LP 3Y 1.45% Tetragon Partners GP Ltd 3Y 7Y 0.39% NEA Management Company, LLC 3Y 7Y 0.35% SILVERARC CAPITAL MANAGEMENT, LLC 3Y 0.3% Boxer Capital Management, LLC 0.22% Birchview Capital, LP 3Y 7Y 0.2% RA CAPITAL MANAGEMENT, L.P. 3Y 7Y 0.16%

FAQ About BlackRock, Inc. and KPTI

These are the practical questions this page is built to answer before you even open the full history table.

How long has BlackRock, Inc. reported owning KPTI?

BlackRock, Inc. reported KPTI across 8 quarterly 13F filings, from 2024 Q3 through 2026 Q2.

What was the largest reported KPTI position in BlackRock, Inc.'s portfolio?

The largest reported portfolio weight for KPTI was 0.00% in 2026 Q2.

What is the latest reported KPTI position on this page?

The most recent filing on this page is 2026 Q2, when BlackRock, Inc. reported 1,418,799 shares, equal to 0.00% of portfolio, with an estimated market value of $13.9M.

What does the chart on this KPTI ownership page compare?

The chart compares BlackRock, Inc.'s quarterly KPTI portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did BlackRock, Inc. time their KPTI position?

Based on 13F filing dates vs. subsequent KPTI price moves, BlackRock, Inc. correctly timed 2 out of 7 reported position changes (29%). The annualised alpha on KPTI relative to SPY over the holding period was +84.9%.

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