Company · Ownership research

AMTECH SYSTEMS INC ASYS

CIK 0000720500 · CUSIP 032332504

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 032332504 (ASYS), not CUSIP 032332904 (ASYS), CUSIP 032332954 (ASYS), and does not merge CUSIPs.

This page lists the top 20 of 79 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	First Eagle Investment Management, LLC CIK 1325447 · Amended · View history	$9.72M 832,453 shares	0.02%	+98.11K(+13.40%)Added	SEC filing ↗ May 14, 2026	▾
02	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$6.59M 564,327 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
03	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$6.18M 529,351 shares	0.00%	-142.76K(-21.20%)Reduced	SEC filing ↗ May 7, 2026	▾
04	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$5.45M 466,837 shares	0.01%	+230.83K(+97.80%)Added	SEC filing ↗ May 13, 2026	▾
05	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$5.30M 453,597 shares	0.00%	+430.85K(+1,894.00%)Added	SEC filing ↗ May 15, 2026	▾
06	MARSHALL WACE, LLP CIK 1318757 · View history	$4.87M 417,076 shares	0.01%	+64.45K(+18.30%)Added	SEC filing ↗ May 15, 2026	▾
07	Pacific Ridge Capital Partners, LLC CIK 1591546 · View history	$4.73M 405,371 shares	1.03%	-222.44K(-35.40%)Reduced	SEC filing ↗ May 11, 2026	▾
08	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history	$4.27M 365,387 shares	0.00%	+18.35K(+5.30%)Added	SEC filing ↗ May 14, 2026	▾
09	JANE STREET GROUP, LLC CIK 1595888 · View history	$3.98M 340,879 shares	0.00%	+15.13K(+4.60%)Added	SEC filing ↗ May 12, 2026	▾
10	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$3.12M 266,856 shares	0.00%	+155.42K(+139.50%)Added	SEC filing ↗ May 15, 2026	▾
11	Connor, Clark & Lunn Investment Management Ltd. CIK 1596800 · View history	$2.03M 174,159 shares	0.00%	+107.28K(+160.40%)Added	SEC filing ↗ May 11, 2026	▾
12	Trexquant Investment LP CIK 1633445 · View history	$2.03M 173,889 shares	0.01%	+84.52K(+94.60%)Added	SEC filing ↗ May 15, 2026	▾
13	BlackRock, Inc. CIK 2012383 · View history	$1.70M 145,446 shares	0.00%	+10.97K(+8.20%)Added	SEC filing ↗ May 13, 2026	▾
14	SUSQUEHANNA INTERNATIONAL GROUP, LLP CIK 1446194 · View history	$1.56M 133,938 shares	0.00%	+53.31K(+66.10%)Added	SEC filing ↗ May 15, 2026	▾
15	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$1.54M 132,149 shares	0.00%	-852(-0.60%)Reduced	SEC filing ↗ May 15, 2026	▾
16	BRIDGEWAY CAPITAL MANAGEMENT, LLC CIK 1107261 · View history	$1.27M 109,118 shares	0.03%	+12.80K(+13.30%)Added	SEC filing ↗ May 15, 2026	▾
17	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$1.26M 108,096 shares	0.00%	-38.50K(-26.30%)Reduced	SEC filing ↗ May 14, 2026	▾
18	CITADEL ADVISORS LLC CIK 1423053 · View history	$1.25M 106,914 shares	0.00%	-17.93K(-14.40%)Reduced	SEC filing ↗ May 15, 2026	▾
19	Palisades Investment Partners, LLC CIK 1427373 · View history	$1.18M 100,656 shares	0.46%	+100.66KNew	SEC filing ↗ Apr 30, 2026	▾
20	SEI INVESTMENTS CO CIK 350894 · View history	$1.08M 92,515 shares	0.00%	+47.28K(+104.50%)Added	SEC filing ↗ May 13, 2026	▾

Showing 20 / 79 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

7,472,025

Not deduplicated across managers

Disclosed value

$87.38M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

AMTECH SYSTEMS INC · Q1 2026

Explore all 79 reporting institutions.

This page includes 20 of 79 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 79 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"032332504","quarter":"2026Q1","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.