CenterBook Partners LP AMPL — AMPLITUDE INC

Ownership history in CenterBook Partners LP  ·  10 quarters on record

AI Ownership Summary

CenterBook Partners LP reported AMPLITUDE INC (AMPL) in 10 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 0.61% in 2024 Q1. The latest visible filing shows AMPL 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. Older history is available after unlock; the visible window still shows the most recent pattern.

What this AMPL ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was CenterBook Partners LP's position in AMPLITUDE 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

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

High-water mark
Peak Conviction
0.61% in 2024 Q1

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.

AMPL stock page CenterBook Partners LP fund profile CenterBook Partners LP full holdings
How CenterBook Partners LP held AMPL — position size vs. price
% of Fund (quarterly)    AMPL 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 Q1 ADDED — — — 40,908 +8,214 +25.1% 0.01% $279K 2026-05-05 $7.95
2025 Q3 REDUCED 89.4% +10.3% ❌ 32,694 -275,843 -89.4% 0.02% $350K 2025-11-07 $10.01
2025 Q2 REDUCED 49.3% -7.7% ✅ 308,537 -299,733 -49.3% 0.21% $3.8M 2025-08-12 $11.23
2025 Q1 REDUCED 17.6% +21.7% ❌ 608,270 -130,234 -17.6% 0.39% $6.2M 2025-05-09 $10.64
2024 Q4 REDUCED 6.5% -3.4% ✅ 738,504 -51,574 -6.5% 0.47% $7.8M 2025-02-13 $12.46
2024 Q3 ADDED — — — 790,078 +567,806 +255.5% 0.44% $7.1M 2024-11-14 $10.07
2024 Q2 REDUCED 72.7% +0.8% ❌ 222,272 -591,704 -72.7% 0.12% $2.0M 2024-08-12 $8.00
2024 Q1 ADDED — — — 813,976 +634,576 +353.7% 0.61% $8.9M 2024-05-10 $9.12
2023 Q4 REDUCED 34.7% -15.4% ✅ 179,400 -95,148 -34.7% 0.28% $2.3M 2024-02-13 $13.75
1 older quarter hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding AMPL

As of 2026 Q1 — sorted by position size

Toronado Partners, LLC 3Y 7Y 4.1% Circumference Group LLC 3.64% Meros Investment Management, LP 3Y 3.44% Gagnon Advisors, LLC 3Y 7Y 3.19% MONIMUS CAPITAL MANAGEMENT, LP 2.39% GAGNON SECURITIES LLC 3Y 7Y 1.67% Optimus Prime Fund Management Co., Ltd. 3Y 7Y 1.04% WESTERLY CAPITAL MANAGEMENT, LLC 3Y 7Y 0.93% Trigran Investments, Inc. 3Y 7Y 0.62% NANO CAP NEW MILLENNIUM GROWTH FUND L P 0.56%

FAQ About CenterBook Partners LP and AMPL

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

How long has CenterBook Partners LP reported owning AMPL?

CenterBook Partners LP reported AMPL across 9 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported AMPL position in CenterBook Partners LP's portfolio?

The largest reported portfolio weight for AMPL was 0.61% in 2024 Q1.

What is the latest reported AMPL position on this page?

The most recent filing on this page is 2026 Q1, when CenterBook Partners LP reported 40,908 shares, equal to 0.01% of portfolio, with an estimated market value of $279K.

What does the chart on this AMPL ownership page compare?

The chart compares CenterBook Partners LP's quarterly AMPL 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 CenterBook Partners LP time their AMPL position?

Based on 13F filing dates vs. subsequent AMPL price moves, CenterBook Partners LP correctly timed 6 out of 9 reported position changes (67%). The annualised alpha on AMPL relative to SPY over the holding period was -27.1%.

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