AMERICAN CAPITAL MANAGEMENT INC TW — Tradeweb Markets

Ownership history in AMERICAN CAPITAL MANAGEMENT INC  ·  24 quarters on record

AI Ownership Summary

AMERICAN CAPITAL MANAGEMENT INC reported Tradeweb Markets (TW) in 24 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 1.9% in 2025 Q1. The latest visible filing shows TW at 1.58% 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 TW ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was AMERICAN CAPITAL MANAGEMENT INC's position in Tradeweb Markets, 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

TW was reported at 1.58% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
1.9% in 2025 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.

TW stock page AMERICAN CAPITAL MANAGEMENT INC fund profile AMERICAN CAPITAL MANAGEMENT INC full holdings
How AMERICAN CAPITAL MANAGEMENT INC held TW — position size vs. price
% of Fund (quarterly)    TW price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 10 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 REDUCED — — — 249,247 -9,468 -3.7% 1.58% $29.3M 2026-05-15 $110.79
2025 Q4 REDUCED — — — 258,715 -7,291 -2.7% 1.23% $27.8M 2026-02-17 $114.03
2025 Q3 REDUCED 8.2% -2.3% ✅ 266,006 -23,813 -8.2% 1.18% $29.5M 2025-11-14 $109.12
2025 Q2 REDUCED 7.7% -23.9% ✅ 289,819 -24,305 -7.7% 1.76% $42.4M 2025-08-14 $129.95
2025 Q1 ADDED — — — 314,124 +15,887 +5.3% 1.90% $46.6M 2025-05-15 $142.72
2024 Q4 ADDED — — — 298,237 +4,008 +1.4% 1.45% $39.0M 2025-02-11 $123.66
2024 Q3 REDUCED — — — 294,229 -2,406 -0.8% 1.19% $36.4M 2024-11-14 $127.79
2024 Q2 ADDED — — — 296,635 +2,089 +0.7% 1.05% $31.4M 2024-08-14 $115.97
2024 Q1 REDUCED — — — 294,546 -10,873 -3.6% 0.98% $30.7M 2024-05-15 $111.67
2023 Q4 REDUCED — — — 305,419 -1,693 -0.6% 0.95% $27.8M 2024-02-14 $101.55
14 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding TW

As of 2026 Q1 — sorted by position size

Square Wave Capital, LLC 14.08% HMI Capital Management, L.P. 3Y 7Y 7.23% Praesidium Investment Management Company, LLC 3Y 7Y 6.31% Linonia Partnership LP 6.1% SeaTown Holdings Pte. Ltd. 3Y 7Y 5.07% WILSON ASSET MANAGEMENT (INTERNATIONAL) PTY LTD 3Y 5.06% Nutshell Asset Management Ltd 4.45% Lakehouse Capital Pty Ltd 3Y 3.97% Evolutionary Tree Capital Management, LLC 3Y 3.66% KENSICO CAPITAL MANAGEMENT CORP 3Y 7Y 2.42%

FAQ About AMERICAN CAPITAL MANAGEMENT INC and TW

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

How long has AMERICAN CAPITAL MANAGEMENT INC reported owning TW?

AMERICAN CAPITAL MANAGEMENT INC reported TW across 10 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported TW position in AMERICAN CAPITAL MANAGEMENT INC's portfolio?

The largest reported portfolio weight for TW was 1.90% in 2025 Q1.

What is the latest reported TW position on this page?

The most recent filing on this page is 2026 Q1, when AMERICAN CAPITAL MANAGEMENT INC reported 249,247 shares, equal to 1.58% of portfolio, with an estimated market value of $29.3M.

What does the chart on this TW ownership page compare?

The chart compares AMERICAN CAPITAL MANAGEMENT INC's quarterly TW 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 AMERICAN CAPITAL MANAGEMENT INC time their TW position?

Based on 13F filing dates vs. subsequent TW price moves, AMERICAN CAPITAL MANAGEMENT INC correctly timed 13 out of 23 reported position changes (57%). The annualised alpha on TW relative to SPY over the holding period was -2.3%.

← Back to AMERICAN CAPITAL MANAGEMENT INC Holdings