Karyopharm Therapeutics Inc. (KPTI): Shares Outstanding

Annual figures by period end, from SEC filings.

Stock splits: 1-for-15, first reflected in a filing dated 2025-05-12. Figures are as filed: per-share figures and share counts last reported before a split are on the old share basis, so changes and growth rates across a split are not shown. Splits are read from the filings' own restatements, so a share conversion in a merger or reorganization shows up the same way.

Figures left out. The filed Shares Outstanding for the year ended 2023-12-31 is not shown: shares outstanding out of scale with weighted shares. That usually means the filing tagged the figure in the wrong unit.

18.31M

As of 2025-12-31

22.68M

As of 2026-06-30

2012-12-31 Shares Outstanding (shares) 2025-12-31

Paler bars were last filed before a stock split, on the old share basis.

Period ended	Shares Outstanding	Change YoY	Source filing
2025-12-31	18.31M	+117.7%	2026-02-13, Balance as of period end
2024-12-31	8.41M	n/c	2026-02-13, Balance as of period end
No annual figure between 2022-12-31 and 2024-12-31.
2022-12-31	113.21M	n/c	2024-02-29, Balance as of period end
2021-12-31	75.75M	+2.5%	2023-02-17, Balance as of period end
2020-12-31	73.92M	+13.1%	2022-03-01, Balance as of period end
2019-12-31	65.37M	+7.5%	2021-02-24, Balance as of period end
2018-12-31	60.83M	+22.8%	2020-02-26, Balance as of period end
2017-12-31	49.53M	+18.3%	2019-02-28, Balance as of period end
2016-12-31	41.89M	+16.8%	2018-03-15, Balance as of period end
2015-12-31	35.86M	+9.7%	2017-03-16, Balance as of period end
2014-12-31	32.70M	+10.5%	2016-03-15, Balance as of period end
2013-12-31	29.59M	n/m	2015-03-13, Balance as of period end
2012-12-31	2.12M	n/a	2014-03-21, Balance as of period end