ARTHUR M. COHEN & ASSOCIATES, LLC ILMN — ILLUMINA INC

Ownership history in ARTHUR M. COHEN & ASSOCIATES, LLC  ·  36 quarters on record

AI Ownership Summary

ARTHUR M. COHEN & ASSOCIATES, LLC reported ILLUMINA INC (ILMN) in 36 quarterly 13F filings from 2023 Q4 through 2025 Q3. Peak portfolio weight reached 0.28% in 2023 Q4. The latest visible filing shows ILMN at 0.08% 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 ILMN ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was ARTHUR M. COHEN & ASSOCIATES, LLC's position in ILLUMINA 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
2025 Q3

ILMN was reported at 0.08% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.28% in 2023 Q4

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 2025 Q3

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.

ILMN stock page ARTHUR M. COHEN & ASSOCIATES, LLC fund profile ARTHUR M. COHEN & ASSOCIATES, LLC full holdings
How ARTHUR M. COHEN & ASSOCIATES, LLC held ILMN — position size vs. price
% of Fund (quarterly)    ILMN price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 8 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q3 REDUCED — — — 4,988 -12 -0.2% 0.08% $474K 2025-10-14 $91.00
2025 Q2 REDUCED 16.0% -3.7% ✅ 5,000 -955 -16.0% 0.08% $477K 2025-07-11 $99.25
2025 Q1 UNCHANGED — — — 5,955 — 0% 0.09% $472K 2025-04-10 $71.26
2024 Q4 REDUCED 11.1% -40.6% ✅ 5,955 -740 -11.1% 0.14% $796K 2025-01-15 $136.19
2024 Q3 REDUCED — — — 6,695 -235 -3.4% 0.16% $864K 2024-10-30 $147.66
2024 Q2 UNCHANGED — — — 6,930 — 0% 0.13% $723K 2024-07-29 $121.56
2024 Q1 REDUCED 18.6% -21.0% ✅ 6,930 -1,584 -18.6% 0.20% $952K 2024-04-22 $116.97
2023 Q4 REDUCED 5.8% -4.7% ✅ 8,514 -520 -5.8% 0.28% $1.2M 2024-01-10 $136.80
28 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding ILMN

As of 2026 Q1 — sorted by position size

Sicart Associates LLC 3Y 7Y 2.62% BOURGEON CAPITAL MANAGEMENT LLC 3Y 7Y 1.7% BENDER ROBERT & ASSOCIATES 3Y 7Y 1.16% VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. 3Y 7Y 1.07% Westmount Partners, LLC 1.07% Spectrum Asset Management, Inc. (NB/CA) 3Y 7Y 0.88% Slow Capital, Inc. 3Y 7Y 0.84% TEALWOOD ASSET MANAGEMENT INC 3Y 7Y 0.73% Douglas Lane & Associates, LLC 3Y 7Y 0.58% Weil Company, Inc. 3Y 7Y 0.57%

FAQ About ARTHUR M. COHEN & ASSOCIATES, LLC and ILMN

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

How long has ARTHUR M. COHEN & ASSOCIATES, LLC reported owning ILMN?

ARTHUR M. COHEN & ASSOCIATES, LLC reported ILMN across 8 quarterly 13F filings, from 2023 Q4 through 2025 Q3.

What was the largest reported ILMN position in ARTHUR M. COHEN & ASSOCIATES, LLC's portfolio?

The largest reported portfolio weight for ILMN was 0.28% in 2023 Q4.

What is the latest reported ILMN position on this page?

The most recent filing on this page is 2025 Q3, when ARTHUR M. COHEN & ASSOCIATES, LLC reported 4,988 shares, equal to 0.08% of portfolio, with an estimated market value of $474K.

What does the chart on this ILMN ownership page compare?

The chart compares ARTHUR M. COHEN & ASSOCIATES, LLC's quarterly ILMN 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 ARTHUR M. COHEN & ASSOCIATES, LLC time their ILMN position?

Based on 13F filing dates vs. subsequent ILMN price moves, ARTHUR M. COHEN & ASSOCIATES, LLC correctly timed 20 out of 28 reported position changes (71%). The annualised alpha on ILMN relative to SPY over the holding period was -13.0%.

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