MAI Capital Management COST — Costco Wholesale Corp COM

Ownership history in MAI Capital Management  ·  109 quarters on record

AI Ownership Summary

MAI Capital Management reported Costco Wholesale Corp COM (COST) in 109 quarterly 13F filings from 2023 Q4 through 2026 Q1. Peak portfolio weight reached 0.76% in 2024 Q2. The latest visible filing shows COST at 0.60% 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 COST ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was MAI Capital Management's position in Costco Wholesale Corp COM, 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

COST was reported at 0.60% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.76% in 2024 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.

COST stock page MAI Capital Management fund profile MAI Capital Management full holdings
How MAI Capital Management held COST — position size vs. price
% of Fund (quarterly)    COST price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 17 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2026 Q1 ADDED — — — 106,578 +106,078 +21215.6% 0.60% $106.2M 2026-05-15 $1048.95
2026 Q1 REDUCED — — — 500 -105,285 -99.5% 0.00% $498K 2026-05-15 $1048.95
2025 Q4 ADDED — — — 105,785 +105,685 +105685.0% 0.52% $91.2M 2026-02-13 $1017.00
2025 Q4 REDUCED 80.0% +15.7% ❌ 100 -400 -80.0% 0.00% $86K 2026-02-13 $1017.00
2025 Q4 REDUCED 99.5% +15.7% ❌ 500 -102,247 -99.5% 0.00% $431K 2026-02-13 $1017.00
2025 Q3 ADDED — — — 102,747 +102,447 +34149.0% 0.59% $95.1M 2025-11-10 $912.99
2025 Q3 REDUCED 99.7% -6.1% ✅ 300 -95,518 -99.7% 0.00% $278K 2025-11-10 $912.99
2025 Q2 ADDED — — — 95,818 +95,618 +47809.0% 0.66% $94.9M 2025-08-12 $987.07
2025 Q2 REDUCED 99.8% -7.2% ✅ 200 -94,696 -99.8% 0.00% $198K 2025-08-12 $987.07
2025 Q1 ADDED — — — 94,896 +94,696 +47348.0% 0.68% $89.8M 2025-05-15 $1004.81
2025 Q1 REDUCED 99.8% +4.8% ❌ 200 -97,907 -99.8% 0.00% $189K 2025-05-15 $1004.81
2024 Q4 ADDED — — — 98,107 +97,807 +32602.3% 0.67% $89.9M 2025-02-14 $1064.46
2024 Q4 REDUCED 99.7% +3.3% ❌ 300 -86,070 -99.7% 0.00% $275K 2025-02-14 $1064.46
2024 Q3 REDUCED — — — 86,370 -4,517 -5.0% 0.73% $76.6M 2024-11-07 $906.63
2024 Q2 ADDED — — — 90,887 +411 +0.5% 0.76% $77.3M 2024-08-12 $855.54
2024 Q1 ADDED — — — 90,476 +16,362 +22.1% 0.69% $66.3M 2024-05-08 $755.23
2023 Q4 ADDED — — — 74,114 +2,481 +3.5% 0.64% $48.9M 2024-02-09 $714.50
92 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding COST

As of 2026 Q1 — sorted by position size

Emerald Advisors, LLC 3Y 76.81% WORLDLY PARTNERS MANAGEMENT, LLC 3Y 41.96% I.G.Y. Ltd 3Y 39.95% STEGINSKY CAPITAL LLC 3Y 7Y 22.3% Norman Fields, Gottscho Capital Management, LLC 3Y 7Y 18.84% Greenbrier Partners Capital Management, LLC 3Y 7Y 17.07% Chapman Investment Management, LLC 3Y 11.9% GARRISON BRADFORD & ASSOCIATES INC 3Y 7Y 11.39% Aljian Capital Management, LLC 3Y 7Y 11.19% UNIO CAPITAL LLC 3Y 7Y 10.92%

FAQ About MAI Capital Management and COST

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

How long has MAI Capital Management reported owning COST?

MAI Capital Management reported COST across 17 quarterly 13F filings, from 2023 Q4 through 2026 Q1.

What was the largest reported COST position in MAI Capital Management's portfolio?

The largest reported portfolio weight for COST was 0.76% in 2024 Q2.

What is the latest reported COST position on this page?

The most recent filing on this page is 2026 Q1, when MAI Capital Management reported 106,578 shares, equal to 0.60% of portfolio, with an estimated market value of $106.2M.

What does the chart on this COST ownership page compare?

The chart compares MAI Capital Management's quarterly COST 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 MAI Capital Management time their COST position?

Based on 13F filing dates vs. subsequent COST price moves, MAI Capital Management correctly timed 62 out of 102 reported position changes (61%). The annualised alpha on COST relative to SPY over the holding period was +8.0%.

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