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The company

Amphastar Pharmaceuticals, Inc.

AMPH · Nasdaq

Health CarePharmaceuticalsJust started moving

AMPH stood above a rising 150-day average in 15 of the last 52 weekly readings, including each of the last 2 weeks. It is 23.1% above that average now. Pharmaceuticals: 32% of its 74 stocks in an uptrend (−7 points in four weeks); Health Care: 26% (−10 points in four weeks).

SEC filings

Statistics

Rotation: Just started moving
Weeks in an uptrend: 2 in a row
Industry in uptrend: 32% -7 in 4 wk
Insider buys, 12 months: $0
Insider sales, 12 months: $2.5M
Officials’ trades on record: 0
Institutions holding: 189 (-2)

In the rotation

Each square a week: lit when it closed above a rising 150-day average. 15 of 52 weeks.

20 Apr – 19 Oct

Pharmaceuticals: A minority of its stocks are in an uptrend and the share has been slipping. Health Care: A minority of its stocks are in an uptrend and the share has fallen sharply over four weeks.

Money in and out

1 Nov 2024 – 1 Oct 2026

Open-market buys above the line and sales below, in dollars.

Congress and officials

No member of Congress or official has disclosed a trade in it.

Insiders

Buy orders, 12 months0

Sale orders, 12 months11

Buyers · sellers0 · 4

Who	Did	Shares	Traded
William J. PetersCFO, EVP & TREASURER	sold	4,139at $25.00	21 Sep 2026filed 23 Sep 2026
Rong ZhouSENIOR EVP, PRODUCTION CENTER	sold	10,000at $23.94	16 Sep 2026filed 17 Sep 2026
Rong ZhouSENIOR EVP, PRODUCTION CENTER	sold	3,187at $23.63	2 Sep 2026filed 3 Sep 2026
Richard K. PrinsDirector	sold	7,973at $20.30	11 Aug 2026filed 12 Aug 2026
William J. PetersCFO, EVP & TREASURER	sold	8,180at $22.48	7 Aug 2026filed 11 Aug 2026

Lines filed since 2 January 2026, newest first; every insider’s older lines are on their own page.

Institutions

Holders189-2 on the quarter

New · exited33 · 34

Reported value$544.3M

Quarter to 30 Jun 2026, against 31 Mar 2026; newest filing 31 Aug 2026.

Manager	Shares	Change
BlackRock, Inc.reduced · filed 7 Aug 2026	5,224,934$105.4M	-196,409−3.6%
DIMENSIONAL FUND ADVISORS LPadded · filed 11 Aug 2026	2,305,107$46.5M	+277,160+13.7%
STATE STREET CORPadded · filed 7 Aug 2026	1,642,126$33.1M	+34,611+2.2%
VANGUARD CAPITAL MANAGEMENT LLCreduced · filed 13 Aug 2026	1,481,952$29.9M	-61,703−4.0%
AMERICAN CENTURY COMPANIES INCadded · filed 12 Aug 2026	1,176,626$23.7M	+159,088+15.6%
MARSHALL WACE, LLPadded · filed 13 Aug 2026	1,066,322$21.5M	+40,682+4.0%
GEODE CAPITAL MANAGEMENT, LLCreduced · filed 12 Aug 2026	969,840$19.6M	-6,810−0.7%
FULLER & THALER ASSET MANAGEMENT, INC.reduced · filed 12 Aug 2026	949,238$19.2M	-445,901−32.0%
D. E. Shaw & Co., Inc.added · filed 14 Aug 2026	887,048$17.9M	+221,506+33.3%
VANGUARD PORTFOLIO MANAGEMENT LLCadded · filed 13 Aug 2026	809,568$16.3M	+21,752+2.8%