Kooman & Associates BRK/B — BERKSHIRE HATHAWAY INC DEL

Ownership history in Kooman & Associates  ·  7 quarters on record

AI Ownership Summary

Kooman & Associates reported BERKSHIRE HATHAWAY INC DEL (BRK/B) in 7 quarterly 13F filings from 2024 Q3 through 2026 Q1. Peak portfolio weight reached 0.09% in 2025 Q1. The latest visible filing shows BRK/B at 0.06% 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 BRK/B ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Kooman & Associates's position in BERKSHIRE HATHAWAY INC DEL, 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

BRK/B was reported at 0.06% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.09% 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
2024 Q3 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.

BRK/B stock page Kooman & Associates fund profile Kooman & Associates full holdings
How Kooman & Associates held BRK/B — position size vs. price
% of Fund (quarterly)
📋 Quarterly Holdings History 7 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 ADDED — — — 421 +8 +1.9% 0.06% $202K 2026-04-21 $468.50
2025 Q4 ADDED — — — 413 +1 +0.2% 0.06% $208K 2026-01-23 $478.97
2025 Q3 REDUCED — — — 412 -10 -2.4% 0.06% $207K 2025-10-21 $491.29
2025 Q2 REDUCED — — — 422 -20 -4.5% 0.07% $205K 2025-07-16 $471.31
2025 Q1 REDUCED — — — 442 -32 -6.8% 0.09% $235K 2025-05-02 $539.80
2024 Q4 ADDED — — — 474 +15 +3.3% 0.08% $215K 2025-02-04 $467.49
2024 Q3 INITIATED — — — 459 — — 0.08% $211K 2024-10-24 $457.77

🏢 Other funds also holding BRK/B

As of 2026 Q1 — sorted by position size

TETRAD CORP 92.15% 1922 Investment Co LLC 3Y 7Y 84.86% CHECK CAPITAL MANAGEMENT INC/CA 3Y 7Y 52.8% Cook & Bynum Capital Management, LLC 3Y 7Y 42.7% Templeton & Phillips Capital Management, LLC 3Y 36.02% Aquamarine Zurich AG 3Y 34.57% Ardent Capital Management, Inc. 3Y 32.73% Asset Management Advisors, LLC 3Y 7Y 32.43% United American Securities Inc. (d/b/a UAS Asset Management) 3Y 7Y 31.97% Pacifica Capital Investments, LLC 3Y 7Y 30.79%

FAQ About Kooman & Associates and BRK/B

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

How long has Kooman & Associates reported owning BRK/B?

Kooman & Associates reported BRK/B across 7 quarterly 13F filings, from 2024 Q3 through 2026 Q1.

What was the largest reported BRK/B position in Kooman & Associates's portfolio?

The largest reported portfolio weight for BRK/B was 0.09% in 2025 Q1.

What is the latest reported BRK/B position on this page?

The most recent filing on this page is 2026 Q1, when Kooman & Associates reported 421 shares, equal to 0.06% of portfolio, with an estimated market value of $202K.

What does the chart on this BRK/B ownership page compare?

The chart compares Kooman & Associates's quarterly BRK/B 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 Kooman & Associates time their BRK/B position?

Based on 13F filing dates vs. subsequent BRK/B price moves, Kooman & Associates correctly timed 4 out of 6 reported position changes (67%). The annualised alpha on BRK/B relative to SPY over the holding period was -12.0%.

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