ACLS — AXCELIS TECHNOLOGIES INC COM

Ownership history in Penbrook Management LLC  ·  49 quarters on record

This page tracks every 13F SEC filing in which Penbrook Management LLC reported a position in AXCELIS TECHNOLOGIES INC COM (ACLS). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.

Peak position
5.93% (2023 Q2)
Avg. % of fund
1.81%
First filed
2011 Q4
Last filed
2025 Q4
Quarters held
49
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 REDUCED 15,895 -1,000 -5.9% 0.88% $1.3M $80.34
2025 Q3 REDUCED 16,895 -2,745 -14.0% 1.15% $1.6M $97.64
2025 Q2 UNCHANGED 19,640 — 0% 0.74% $976K $69.69
2025 Q1 ADDED 19,640 +75 +0.4% 0.74% $976K $49.67
45 older quarters hidden  —  Sign in free or upgrade to Premium to see full history
% of Fund (quarterly)    ACLS price (monthly, adj. close)

Other funds also holding ACLS

As of 2025 Q4 — sorted by position size

REINHART PARTNERS, LLC. 3Y 7Y 3.83% Soviero Asset Management, LP 3Y 1.77% Jackson Square Partners, LLC 3Y 7Y 1.08% GLOBEFLEX CAPITAL L P 3Y 7Y 0.69% Firsthand Capital Management, Inc. 3Y 7Y 0.6% Jackson Creek Investment Advisors LLC 3Y 0.52% BlackBarn Capital Partners LP 0.51% Wakefield Asset Management LLLP 3Y 7Y 0.4% ISTHMUS PARTNERS, LLC 3Y 7Y 0.37% Bridgefront Capital, LLC 3Y 0.36%
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