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Amphastar Pharmaceuticals AMPH · USD

Health Care · US listing · 🇺🇸 United States

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29.38

+3.12%

Close of 9 Nov 2026, in USD

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Reference data, closing prices and charts across 45,000 companies, plus crypto, commodities and currencies.

Largest shareholders

As filed, so dates differ, and a group and its funds can both appear.

HolderSharesStakeChangeFiled
BLACKROCK, INC.5.4m11.24%−40.7k31 Mar 2026
BlackRock Institutional Trust Company, N.A.4.9m10.25%+5k31 Dec 2025
The Vanguard Group, Inc.2.6m5.36%−22.9k31 Dec 2025
DIMENSIONAL FUND ADVISORS LP2m4.21%+228.3k31 Mar 2026
TD Asset Management Inc.2m4.07%+31.2k31 Dec 2025
Dimensional Fund Advisors, L.P.1.8m3.73%+44k31 Dec 2025
STATE STREET CORP1.6m3.33%+75.7k31 Mar 2026
VANGUARD CAPITAL MANAGEMENT LLC1.5m3.20%+1.5m31 Mar 2026
TD ASSET MANAGEMENT INC1.5m3.20%−422k31 Mar 2026
State Street Investment Management (US)1.5m3.18%+31k31 Dec 2025
FULLER & THALER ASSET MANAGEMENT, INC.1.4m2.89%+67631 Mar 2026
Fuller & Thaler Asset Management Inc.1.4m2.89%+40.5k31 Dec 2025
Marshall Wace LLP1.2m2.57%+363.2k31 Dec 2025
Epoch Investment Partners, Inc.1.1m2.34%−7.4k31 Dec 2025
Boston Trust Walden Company1.1m2.26%−85.8k31 Dec 2025

Short interest

Shares sold short, 15 Oct 2026. US exchange data.

4.3m

-1.6% on the period before. 9.8 days to cover.

Short volume

Share of the day's trading sold short, 4 Nov 2026

51.8%

Last 60 trading days.

Failed deliveries

Shares not delivered on settlement, from the SEC

  • 17 Sept 202679 shares
  • 16 Sept 20261,021 shares
  • 14 Sept 2026787 shares
  • 26 Aug 20264 shares
  • 20 Aug 202613,708 shares

Sources and methodology

Data on this tab
Our data supplier
Chart on the Overview
TradingView

Nothing here is investment advice. Prices can be delayed or wrong, so check with the exchange before relying on them. Data for this page. How we cover markets.