Company · Ownership research

Avantor, Inc. AVTR

CIK 0001722482 · CUSIP 05352A100

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 05352A100 (AVTR), not CUSIP 05352A900 (AVTR), CUSIP 05352A950 (AVTR), and does not merge CUSIPs.

This page lists the top 20 of 433 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	DODGE & COX CIK 200217 · View history	$938.04M 119,648,329 shares	0.52%	+2.58M(+2.20%)Added	SEC filing ↗ May 14, 2026	▾
02	BlackRock, Inc. CIK 2012383 · View history	$515.12M 65,703,554 shares	0.01%	+6.11M(+10.20%)Added	SEC filing ↗ May 13, 2026	▾
03	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$245.20M 31,275,847 shares	0.01%	—	SEC filing ↗ May 8, 2026	▾
04	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$239.95M 30,606,112 shares	0.01%	—	SEC filing ↗ May 15, 2026	▾
05	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$189.92M 24,224,156 shares	0.04%	+787.52K(+3.40%)Added	SEC filing ↗ May 15, 2026	▾
06	GREENHAVEN ASSOCIATES INC CIK 846222 · View history	$177.14M 22,593,838 shares	2.92%	+2.09M(+10.20%)Added	SEC filing ↗ Apr 6, 2026	▾
07	BARROW HANLEY MEWHINNEY & STRAUSS LLC CIK 313028 · View history	$175.29M 22,358,399 shares	0.57%	-10.93M(-32.80%)Reduced	SEC filing ↗ May 13, 2026	▾
08	STATE STREET CORP CIK 93751 · View history	$162.45M 20,721,079 shares	0.01%	+511.67K(+2.50%)Added	SEC filing ↗ May 15, 2026	▾
09	Engine Capital Management, LP CIK 1665590 · View history	$155.08M 19,780,830 shares	18.72%	+7.85M(+65.80%)Added	SEC filing ↗ May 15, 2026	▾
10	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$132.44M 16,894,649 shares	0.03%	+2.29M(+15.70%)Added	SEC filing ↗ May 7, 2026	▾
11	T. Rowe Price Investment Management, Inc. CIK 1897612 · View history	$115.93M 14,786,678 shares	0.08%	-17.35M(-54.00%)Reduced	SEC filing ↗ May 15, 2026	▾
12	New Mountain Capital, L.L.C. CIK 1407718 · View history	$109.76M 14,000,000 shares	100.00%	0(0.00%)Unchanged	SEC filing ↗ May 13, 2026	▾
13	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$102.79M 13,110,674 shares	0.08%	+6.89M(+110.90%)Added	SEC filing ↗ May 15, 2026	▾
14	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$101.09M 12,891,421 shares	0.01%	+912.86K(+7.60%)Added	SEC filing ↗ May 15, 2026	▾
15	LONDON CO OF VIRGINIA CIK 1259887 · View history	$85.08M 10,852,257 shares	0.52%	-1.08M(-9.10%)Reduced	SEC filing ↗ May 15, 2026	▾
16	FULLER & THALER ASSET MANAGEMENT, INC. CIK 1082327 · View history	$83.36M 10,632,112 shares	0.28%	+9.01M(+555.30%)Added	SEC filing ↗ May 14, 2026	▾
17	Clarkston Capital Partners, LLC CIK 1562855 · View history	$67.65M 8,629,389 shares	5.16%	-6.48M(-42.90%)Reduced	SEC filing ↗ May 14, 2026	▾
18	First Pacific Advisors, LP CIK 1377581 · View history	$63.42M 8,089,023 shares	0.89%	+4.12M(+103.80%)Added	SEC filing ↗ May 14, 2026	▾
19	Invesco Ltd. CIK 914208 · Amended · View history	$63.30M 8,073,854 shares	0.01%	-9.10M(-53.00%)Reduced	SEC filing ↗ May 12, 2026	▾
20	FMR LLC CIK 315066 · View history	$59.66M 7,610,318 shares	0.00%	-60.41K(-0.80%)Reduced	SEC filing ↗ May 15, 2026	▾

Showing 20 / 433 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

433

Cancelled or null records excluded

Disclosed shares

675,686,755

Not deduplicated across managers

Disclosed value

$5.31B

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.

Avantor, Inc. · Q1 2026

Explore all 433 reporting institutions.

This page includes 20 of 433 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 433 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":"05352A100","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.