1620 INVESTMENT ADVISORS, INC. AMPH — Amphastar Pharma Inc

Ownership history in 1620 INVESTMENT ADVISORS, INC.  ·  9 quarters on record

AI Ownership Summary

1620 INVESTMENT ADVISORS, INC. reported Amphastar Pharma Inc (AMPH) in 9 quarterly 13F filings from 2024 Q2 through 2026 Q2. Peak portfolio weight reached 0.08% in 2024 Q3. The latest visible filing shows AMPH at 0.01% 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 AMPH ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was 1620 INVESTMENT ADVISORS, INC.'s position in Amphastar Pharma 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

AMPH was reported at 0.01% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.08% in 2024 Q3

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

Time in book
Holding Window
2024 Q2 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.

AMPH stock page 1620 INVESTMENT ADVISORS, INC. fund profile 1620 INVESTMENT ADVISORS, INC. full holdings
How 1620 INVESTMENT ADVISORS, INC. 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 9 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q2 REDUCED — — — 615 -103 -14.3% 0.01% $12K 2026-07-14 $18.81
2026 Q1 UNCHANGED — — — 718 — 0% 0.01% $14K 2026-05-13 $18.32
2025 Q4 ADDED — — — 718 +36 +5.3% 0.01% $19K 2026-02-05 $28.63
2025 Q3 UNCHANGED — — — 682 — 0% 0.01% $18K 2025-10-07 $25.83
2025 Q2 REDUCED 70.0% +17.2% ❌ 682 -1,595 -70.0% 0.01% $16K 2025-08-07 $21.62
2025 Q1 REDUCED — — — 2,277 -11 -0.5% 0.05% $66K 2025-05-14 $23.30
2024 Q4 REDUCED — — — 2,288 -79 -3.3% 0.06% $85K 2025-02-11 $32.21
2024 Q3 ADDED — — — 2,367 +49 +2.1% 0.08% $115K 2024-10-25 $50.29
2024 Q2 INITIATED — — — 2,318 — — 0.07% $93K 2024-07-23 $40.55

🏢 Other funds also holding AMPH

As of 2026 Q2 — sorted by position size

LAM GROUP, INC. 3Y 1.31% SummerHaven Investment Management, LLC 3Y 0.35% Significant Wealth Partners LLC 0.23% Polaris Capital Management, LLC 3Y 7Y 0.08% SteelPeak Wealth, LLC 3Y 0.03% Y-Intercept (Hong Kong) Ltd 3Y 0.01% China Universal Asset Management Co., Ltd. 3Y 0.01% EXCHANGE TRADED CONCEPTS, LLC 3Y 0.01% Louisiana State Employees Retirement System 3Y 7Y 0.01% State of Alaska, Department of Revenue 3Y 7Y 0.01%

FAQ About 1620 INVESTMENT ADVISORS, INC. and AMPH

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

How long has 1620 INVESTMENT ADVISORS, INC. reported owning AMPH?

1620 INVESTMENT ADVISORS, INC. reported AMPH across 9 quarterly 13F filings, from 2024 Q2 through 2026 Q2.

What was the largest reported AMPH position in 1620 INVESTMENT ADVISORS, INC.'s portfolio?

The largest reported portfolio weight for AMPH was 0.08% in 2024 Q3.

What is the latest reported AMPH position on this page?

The most recent filing on this page is 2026 Q2, when 1620 INVESTMENT ADVISORS, INC. reported 615 shares, equal to 0.01% of portfolio, with an estimated market value of $12K.

What does the chart on this AMPH ownership page compare?

The chart compares 1620 INVESTMENT ADVISORS, INC.'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.

How well did 1620 INVESTMENT ADVISORS, INC. time their AMPH position?

Based on 13F filing dates vs. subsequent AMPH price moves, 1620 INVESTMENT ADVISORS, INC. correctly timed 3 out of 6 reported position changes (50%). The annualised alpha on AMPH relative to SPY over the holding period was -42.6%.

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