Jackson Square Partners, LLC ACLS — AXCELIS TECHNOLOGIES INC COM NEW COM NEW

Ownership history in Jackson Square Partners, LLC  ·  9 quarters on record

AI Ownership Summary

Jackson Square Partners, LLC reported AXCELIS TECHNOLOGIES INC COM NEW COM NEW (ACLS) in 9 quarterly 13F filings from 2023 Q4 through 2025 Q4. Peak portfolio weight reached 3.15% in 2024 Q2. The latest visible filing shows ACLS at 1.08% 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.

What this ACLS ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was Jackson Square Partners, LLC's position in AXCELIS TECHNOLOGIES INC COM NEW COM NEW, 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 Q4

ACLS was reported at 1.08% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
3.15% 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 2025 Q4

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.

ACLS stock page Jackson Square Partners, LLC fund profile Jackson Square Partners, LLC full holdings
How Jackson Square Partners, LLC held ACLS — position size vs. price
% of Fund (quarterly)    ACLS 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)
2025 Q4 UNCHANGED — — — 27,335 — 0% 1.08% $2.7M 2026-02-14 (Est.) $94.55
2025 Q3 REDUCED 22.0% -16.2% ✅ 27,335 -7,714 -22.0% 1.08% $2.7M 2025-11-05 $84.45
2025 Q2 REDUCED 83.3% +38.8% ❌ 35,049 -175,295 -83.3% 0.90% $2.4M 2025-08-07 $79.51
2025 Q1 ADDED — — — 210,344 +23,754 +12.7% 1.41% $10.4M 2025-05-12 $62.15
2024 Q4 REDUCED 23.3% -28.9% ✅ 186,590 -56,757 -23.3% 1.36% $13.0M 2025-02-12 $60.14
2024 Q3 REDUCED 33.0% -33.2% ✅ 243,347 -119,596 -33.0% 2.20% $25.5M 2024-11-13 $79.72
2024 Q2 REDUCED 26.3% -26.3% ✅ 362,943 -129,821 -26.3% 3.15% $51.6M 2024-08-13 $112.66
2024 Q1 ADDED — — — 492,764 +162,040 +49.0% 2.29% $55.0M 2024-05-08 $111.46
2023 Q4 INITIATED — — — 330,724 — — 1.39% $42.9M 2024-02-08 $122.25

🏢 Other funds also holding ACLS

As of 2026 Q1 — sorted by position size

REINHART PARTNERS, LLC. 3Y 7Y 4.44% QSM Asset Management Ltd 2.27% Penbrook Management LLC 3Y 7Y 0.85% Illumine Investment Management, LLC 0.73% Eagle Bay Advisors LLC 3Y 0.51% ISTHMUS PARTNERS, LLC 3Y 7Y 0.38% KERR FINANCIAL PLANNING Corp 0.35% HARBOR CAPITAL ADVISORS, INC. 3Y 0.32% Boston Trust Walden Corp 3Y 7Y 0.29% MOKAN Wealth Management Inc. 0.29%

FAQ About Jackson Square Partners, LLC and ACLS

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

How long has Jackson Square Partners, LLC reported owning ACLS?

Jackson Square Partners, LLC reported ACLS across 9 quarterly 13F filings, from 2023 Q4 through 2025 Q4.

What was the largest reported ACLS position in Jackson Square Partners, LLC's portfolio?

The largest reported portfolio weight for ACLS was 3.15% in 2024 Q2.

What is the latest reported ACLS position on this page?

The most recent filing on this page is 2025 Q4, when Jackson Square Partners, LLC reported 27,335 shares, equal to 1.08% of portfolio, with an estimated market value of $2.7M.

What does the chart on this ACLS ownership page compare?

The chart compares Jackson Square Partners, LLC's quarterly ACLS 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 Jackson Square Partners, LLC time their ACLS position?

Based on 13F filing dates vs. subsequent ACLS price moves, Jackson Square Partners, LLC correctly timed 4 out of 8 reported position changes (50%).

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