AMERICAN SECURITIES LLC — 13F Holdings & Portfolio

CIK 1475483 · latest 13F-HR filed 2026-08-26

AMERICAN SECURITIES LLC manages $3.75B in 13F-reported U.S. long-equity assets across 2 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are MWH (75.21%), AMTM (24.79%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 0 new positions and exited 0; 0 existing positions rose in reported value and 1 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

Loading holdings…
AUM
$3.75B

Long-equity book

Holdings
2

Distinct positions

Period
2026-06-30

Filed 2026-08-26

Q/Q Activity
+0 / −0 / ↑0 / ↓1

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 100%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated May 14, 2026.

Assets Under Management
$18.91B
Discretionary
$18.91B
Employees
150
Accounts
23
Address
590 MADISON AVENUE
38TH FLOOR
NEW YORK, NY 10022
Phone
(212) 476-8000
Name Title / Status Ownership Type
AMERICAN SECURITIES INTERMEDIATE HOLDINGS, LLC ControlMANAGING MEMBER
since Jan 2026
75% or moreDomestic Entity
DOMONKOS, JOSEPH, ANTHONY ControlCFO
since Nov 2011
Less than 5%Individual
FISCH, MICHAEL, GERALD ControlCEO
since Apr 1994
Less than 5%Individual
MAUE, DAVID, JUDE ControlCOO
since Jul 2007
Less than 5%Individual
SCHONDORF, ERIC, LOWELL ControlGENERAL COUNSEL
since Sep 2005
Less than 5%Individual
WOLFF, SCOTT, MICHAEL ControlPRESIDENT
since Jan 2025
Less than 5%Individual
AMERICAN SECURITIES HOLDINGS, LLCMEMBER
since Oct 2018
Less than 5%Domestic Entity
MACO, JEREMY, BRAINARDCCO
since Jan 2018
Less than 5%Individual
AMERICAN SECURITIES HOLDINGS, LLC Control
Indirect owner via AMERICAN SECURITIES INTERMEDIATE HOLDINGS, LLC
MANAGING MEMBER
since Jan 2026
25–50%Domestic Entity
ASCP LLC Control
Indirect owner via AMERICAN SECURITIES HOLDINGS, LLC
MANAGING MEMBER
since Oct 2018
50–75%Domestic Entity
FISCH, MICHAEL, GERALD Control
Indirect owner via THE MICHAEL G. FISCH 2006 REVOCABLE TRUST
TRUSTEE
since Feb 2006
General partner, trustee or managerIndividual
THE MICHAEL G. FISCH 2006 REVOCABLE TRUST Control
Indirect owner via ASCP LLC
SOLE MEMBER
since Oct 2018
75% or moreDomestic Entity
DYAL CAPITAL PARTNERS IV HOLDINGS (A) LP
Indirect owner via AMERICAN SECURITIES HOLDINGS, LLC
MEMBER
since Jan 2026
25–50%Domestic Entity
Ownership & leadership changes · 11 filings with changes since Feb 14, 2012

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Jan 16, 2026 filing
  • Listed againFISCH, MICHAEL, GERALD · TRUSTEE · General partner, trustee or manager · indirect via THE MICHAEL G. FISCH 2006 REVOCABLE TRUST · control person
  • Listed againTHE MICHAEL G. FISCH 2006 REVOCABLE TRUST · SOLE MEMBER · 75% or more · indirect via ASCP LLC · control person
Jan 6, 2026 filing
  • No longer listedFISCH, MICHAEL, GERALD · TRUSTEE · General partner, trustee or manager · indirect via MICHAEL G. FISCH 2006 REVOCABLE TRUST · control person · listed since Feb 2006
  • No longer listedMICHAEL G. FISCH 2006 REVOCABLE TRUST · MANAGING MEMBER · Less than 5% · control person · listed since Feb 2006
  • No longer listedTHE MICHAEL G. FISCH 2006 REVOCABLE TRUST · SOLE MEMBER · 75% or more · indirect via ASCP LLC · control person · listed since Oct 2018
  • AddedAMERICAN SECURITIES HOLDINGS, LLC · MANAGING MEMBER · 25–50% · indirect via AMERICAN SECURITIES INTERMEDIATE HOLDINGS, LLC · control person
  • AddedAMERICAN SECURITIES INTERMEDIATE HOLDINGS, LLC · MANAGING MEMBER · 75% or more · control person
  • AddedDYAL CAPITAL PARTNERS IV HOLDINGS (A) LP · MEMBER · 25–50% · indirect via AMERICAN SECURITIES HOLDINGS, LLC
  • ChangedAMERICAN SECURITIES HOLDINGS, LLC · title SOLE MEMBER → MEMBER; ownership 75% or more → Less than 5%; no longer a control person
  • ChangedASCP LLC · indirect via AMERICAN SECURITIES HOLDINGS, LLC: ownership 75% or more → 50–75%
Jan 6, 2025 filing
  • AddedWOLFF, SCOTT, MICHAEL · PRESIDENT · Less than 5% · control person
Mar 29, 2024 filing
  • ChangedMAUE, DAVID, JUDE · title CAO → COO
Mar 31, 2022 filing
  • No longer listedAMERICAN SECURITIES LLC · MEMBER - CAPITAL YUAN TAO ADVISORS LLC · 75% or more · control person · listed since Mar 2007
Mar 31, 2020 filing
  • ChangedMICHAEL G. FISCH 2006 REVOCABLE TRUST · ownership 25–50% → Less than 5%
Oct 25, 2018 filing
  • No longer listedASCP LLC · MEMBER · 25–50% · control person · listed since Jan 2011
  • AddedAMERICAN SECURITIES HOLDINGS, LLC · SOLE MEMBER · 75% or more · control person
  • AddedASCP LLC · MANAGING MEMBER · 75% or more · indirect via AMERICAN SECURITIES HOLDINGS, LLC · control person
  • ChangedFISCH, MICHAEL, GERALD · title CEO / TRUSTEE - THE MICHAEL G. FISCH 2006 REVOCABLE TRUST → CEO; ownership 50–75% → Less than 5%
  • ChangedTHE MICHAEL G. FISCH 2006 REVOCABLE TRUST · indirect via ASCP LLC: title MANAGER → SOLE MEMBER; ownership 50–75% → 75% or more
Jun 1, 2018 filing
  • No longer listedFISCH, MICHAEL, GERALD · TRUSTEE · General partner, trustee or manager · indirect via THE MICHAEL G. FISCH 2006 REVOCABLE TRUST · control person · listed since Feb 2006
  • AddedFISCH, MICHAEL, GERALD · TRUSTEE · General partner, trustee or manager · indirect via MICHAEL G. FISCH 2006 REVOCABLE TRUST · control person
Mar 29, 2018 filing
  • AddedMACO, JEREMY, BRAINARD · CCO · Less than 5%
  • ChangedMAUE, DAVID, JUDE · title CAO/CCO → CAO
Mar 30, 2017 filing
  • ChangedASCP LLC · ownership 50–75% → 25–50%
  • ChangedTHE MICHAEL G. FISCH 2006 REVOCABLE TRUST · indirect via ASCP LLC: ownership 75% or more → 50–75%
Older changes (2 more filings)
Apr 1, 2015 filing
  • No longer listedTHE MICHAEL G. FISCH 2006 REVOCABLE TRUST · MEMBER · 50–75% · control person · listed since Jan 2011
  • AddedMICHAEL G. FISCH 2006 REVOCABLE TRUST · MANAGING MEMBER · 25–50% · control person
  • ChangedASCP LLC · title MANAGING MEMBER → MEMBER; ownership 25–50% → 50–75%
Feb 14, 2012 filing (earliest on record)
  • ListedAMERICAN SECURITIES LLC · MEMBER - CAPITAL YUAN TAO ADVISORS LLC · 75% or more · control person
  • ListedASCP LLC · MANAGING MEMBER · 25–50% · control person
  • ListedDOMONKOS, JOSEPH, ANTHONY · CFO · Less than 5% · control person
  • ListedFISCH, MICHAEL, GERALD · CEO / TRUSTEE - THE MICHAEL G. FISCH 2006 REVOCABLE TRUST · 50–75% · control person
  • ListedFISCH, MICHAEL, GERALD · TRUSTEE · General partner, trustee or manager · indirect via THE MICHAEL G. FISCH 2006 REVOCABLE TRUST · control person
  • ListedMAUE, DAVID, JUDE · CAO/CCO · Less than 5% · control person
  • ListedSCHONDORF, ERIC, LOWELL · GENERAL COUNSEL · Less than 5% · control person
  • ListedTHE MICHAEL G. FISCH 2006 REVOCABLE TRUST · MEMBER · 50–75% · control person
  • ListedTHE MICHAEL G. FISCH 2006 REVOCABLE TRUST · MANAGER · 75% or more · indirect via ASCP LLC · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

  • No increased positions.
Show all 0 →

Top Trims

Show all 1 →

New Positions

  • No new positions this quarter.
Show all 0 →

Exited Positions

  • No exits this quarter.
Show all 0 →

AMERICAN SECURITIES LLC Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 SOLV Energy Inc MWH 78475V103 $2.82B 75.21% 82,920,401 SH
2 Amentum Holdings, Inc. AMTM 023939101 $930.7M 24.79% 45,026,743 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-26 $3.75B 2 0001140361-26-034405
2026-03-31 2026-05-14 $3.93B 2 0001140361-26-021229
2025-12-31 2026-02-12 $1.31B 1 0001140361-26-004947
2025-09-30 2025-11-07 $1.08B 1 0001140361-25-041164
Filer Information
Address
590 MADISON AVENUE, 38TH FLOOR
NEW YORK, NY 10022
Phone
(212) 476-8000
Filing Manager
AMERICAN SECURITIES LLC
NEW YORK, NY
Signatory
Eric L. Schondorf
General Counsel