AMPH — Amphastar Pharmaceuticals Inc

Ownership history in MassMutual Private Wealth & Trust, FSB  ·  19 quarters on record

AI Ownership Summary

MassMutual Private Wealth & Trust, FSB reported Amphastar Pharmaceuticals Inc (AMPH) in 19 quarterly 13F filings from 2023 Q4 through 2026 Q1. The latest visible filing shows AMPH 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. Older history is available after unlock; the visible window still shows the most recent pattern.

What this AMPH ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was MassMutual Private Wealth & Trust, FSB's position in Amphastar Pharmaceuticals 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 Q1

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

High-water mark
Peak Conviction
0.0% in 2025 Q2

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

Time in book
Holding Window
2023 Q4 to 2026 Q1

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.

AMPH stock page MassMutual Private Wealth & Trust, FSB fund profile MassMutual Private Wealth & Trust, FSB full holdings
How MassMutual Private Wealth & Trust, FSB held AMPH — position size vs. price
% of Fund (quarterly)    AMPH price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 REDUCED 224 -543 -70.8% 0.00% $4K 2026-04-13 $21.36
2025 Q4 REDUCED 767 -160 -17.3% 0.00% $21K 2026-01-07 $27.33
2025 Q3 REDUCED 927 -335 -26.5% 0.00% $25K 2025-10-22 $24.52
2025 Q2 ADDED 1,262 +831 +192.8% 0.00% $29K 2025-07-09 $22.44
2025 Q1 ADDED 431 +334 +344.3% 0.00% $12K 2025-04-01 $28.29
2024 Q4 UNCHANGED 97 — 0% 0.00% $4K 2025-01-16 $35.66
2024 Q3 UNCHANGED 97 — 0% 0.00% $5K 2024-10-02 $46.50
2024 Q2 UNCHANGED 97 — 0% 0.00% $4K 2024-07-02 $37.58
2024 Q1 UNCHANGED 97 — 0% 0.00% $4K 2024-04-09 $40.90
2023 Q4 UNCHANGED 97 — 0% 0.00% $6K 2024-01-03 $61.04
9 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding AMPH

As of 2026 Q1 — sorted by position size

EXCHANGE TRADED CONCEPTS, LLC 3Y 0.01% CX Institutional 3Y 7Y 0.0% Bank of New Hampshire 3Y 0.0% SG Americas Securities, LLC 3Y 7Y 0.0% Versant Capital Management, Inc 3Y 7Y 0.0% Capital Advisors, Ltd. LLC 3Y 7Y 0.0% GF FUND MANAGEMENT CO. LTD. 0.0% GAMMA Investing LLC 0.0% Farther Finance Advisors, LLC 0.0% SIGNATUREFD, LLC 3Y 7Y 0.0%

FAQ About MassMutual Private Wealth & Trust, FSB and AMPH

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

How long has MassMutual Private Wealth & Trust, FSB reported owning AMPH?

MassMutual Private Wealth & Trust, FSB reported AMPH across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported AMPH position in MassMutual Private Wealth & Trust, FSB's portfolio?

The largest reported portfolio weight for AMPH was 0.00% in 2025 Q2.

What is the latest reported AMPH position on this page?

The most recent filing on this page is 2026 Q1, when MassMutual Private Wealth & Trust, FSB reported 224 shares, equal to 0.00% of portfolio, with an estimated market value of $4K.

What does the chart on this AMPH ownership page compare?

The chart compares MassMutual Private Wealth & Trust, FSB's quarterly AMPH 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.

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