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ACLS · Axcelis Technologies Inc · Holdings

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Market Cap
$3.58B
Shares
30.88M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 443
Total Value: $6,010,479,356
Total Shares: 31,715,437
Showing 1–100 of 460 holdings by value · page 1 of 5

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 443 13F filers · Δ vs Mar 31, 2026
Top Holder
15.9%
Sep 2023 → Jun 2026 · range 15.0% – 20.0%
+0.8 pts
Top 5
44.9%
Sep 2023 → Jun 2026 · range 39.3% – 44.9%
+5.7 pts
Top 10
58.8%
Sep 2023 → Jun 2026 · range 52.2% – 58.8%
+1.9 pts
HHI
589
Sep 2023 → Jun 2026 · range 489 – 672
Broadly held+100

Quarterly Activity

vs Mar 31, 2026
New
111
Increased
119
Decreased
148
Sold Out
52
Unchanged
65
Holder count: +59
Institutional value: +96.5%
Shares held: -3.5%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 460
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1113232 CUSIP 054540208 13F (30d) 158 filings 155 filers Visit website Investor relations