Amentum Holdings Inc (AMTM): Hedge Fund Ownership & Smart Money Signals (Q1 2026)

Q: Is it too late to buy Amentum Holdings Inc (AMTM) following the 2026 Q1 hedge fund 13F filings?

As of today, AMTM has moved nan% since the 2026 Q1 13F filing date (May 15, 2026), compared to +4.8% for the XLI sector ETF — an outperformance of nan%. Since the quarter end (March 31, 2026), AMTM gained nan% vs +11.0% for XLI. The stock is tracking its sector benchmark closely. The signal remains fresh and the entry point is still near the fund's implied reference.

Amentum Holdings Inc (AMTM)

480 + Investors. Track Smart Money conviction in AMTM. See who's accumulating, reducing, or initiating positions.

Smart Money Signals — AMTM

Based on 485 hedge funds · latest filing: 2026 Q1 · updated quarterly

📈

Buying streak — 2 quarters in a row

last 6Q

For 2 consecutive quarters, more hedge funds added AMTM than sold it. That's a consistent pattern of professional buying — not a one-time trade. When institutions keep buying quarter after quarter, it usually means they see a multi-year opportunity, not just a short-term momentum flip.

🏔️

At the ownership peak (100% of max)

100% of all-time peak

485 hedge funds hold AMTM right now — the highest count in 3.0 years. When ownership is this concentrated, any bad news can trigger a chain reaction: one big fund sells, others follow. This is a classic 'crowded trade' — high popularity doesn't equal safety.

📶

Steady growth — +20% more funds vs a year ago

fund count last 6Q

+81 new funds entered over the past year (+20% YoY). Gradual, steady growth in institutional ownership is generally a healthy signal — not a speculative rush, but consistent conviction.

🟡

Slight buying edge — 50% buying

226 buying226 selling

Last quarter: 226 funds bought or added vs 226 that reduced or exited. It's nearly a 50/50 split — some institutions are convinced, others are taking profits. This mixed picture is normal near price highs.

⚠️

Fewer new buyers each quarter (-21 vs last Q)

new funds entering per quarter

Funds opening this position for the first time: 112 → 74 → 95 → 74. Each quarter fewer new institutions are entering. This usually means most funds that wanted in are already in — the stock is well-known but the pool of potential new buyers is shrinking.

🔄

Mostly new holders — 28% entered in last year

■ 3% conviction (2yr+) ■ 69% medium ■ 28% new

Only 14 funds (3%) have held >2 years. The majority of current holders are relatively new to the position. New holders tend to sell faster when prices drop — a shallow conviction base that could amplify any sell-off.

➡️

Steady discovery — ~74 new funds/quarter

74 → 112 → 74 → 95 → 74 new funds/Q

New funds entering each quarter: 112 → 74 → 95 → 74. Consistent flow of new institutional buyers without clear acceleration or slowdown.

📊

Mixed cohorts — 2% veterans, 33% new entrants

■ 2% veterans ■ 64% 1-2yr ■ 33% new

Of 509 current holders: 12 (2%) held 2+ years, 327 held 1–2 years, 170 (33%) entered in the past year. Balanced distribution — some institutional memory, some recent momentum buyers.

✅

Strong quality — 35% AUM from major funds

35% from top-100 AUM funds

49 of 482 holders rank in the top 100 by AUM, accounting for 35% of total institutional value held. A meaningful share of the ownership value comes from the most well-resourced institutions.

3.9

out of 10

Low Exit Risk

Exit risk score 3.9/10 — low institutional crowding. Ownership is below peak levels, holder base is relatively sticky, and buying momentum is positive.

Methodology note: these Smart Money cards use consecutive 13F disclosure snapshots, not trade-by-trade execution data. "Buying", "selling", "new holders", and "trimmed" refer to quarter-over-quarter changes in reported holders, aggregate shares, or disclosed position values between filings. They are useful for ownership regime analysis and crowding, but they do not imply exact trade timing on the filing date.

Metric	All 13F Filers (2026 Q1)	Prior (2025 Q4)	Change
Funds Holding	480	479	0.21%
13F Shares	216M	207M	4.12%
Total Value	$5.22B	$5.85B	-10.8%
New Positions	70	95	-25
Increased Positions	149	133	+16
Closed Positions	69	66	+3
Reduced Positions	149	152	-3
Total Calls	15	11	36.36%
Total Puts	12	9	33.33%
PUT/CALL Ratio	0.8	0.82	Neutral

Metric

All 13F Filers (2026 Q1)

Prior (2025 Q4)

Change

Funds Holding

480

479

0.21%

13F Shares

216M

207M

4.12%

Total Value

$5.22B

$5.85B

-10.8%

New Positions

-25

Increased Positions

149

133

+16

Closed Positions

Reduced Positions

149

152

-3

Total Calls

36.36%

Total Puts

33.33%

PUT/CALL Ratio

0.8

0.82

Neutral

Institutional Holders (2026 Q1)

480 + investors

Explore institutional interest and hedge fund ownership dynamics. Analyze portfolio weights, new positions, and conviction trends in AMTM. Verified SEC 13F-HR filings.

QUARTER:

FILTER:All New Added To Reduced No Change | Overweight >5%

Top 25 AMTM holders by conviction (% of portfolio weight) — 2026 Q1 · Source: SEC Form 13F
#	Investor	% of Portfolio	Shares	Mkt Value
1	American Securities LLC	29.88%	45,026,743	$1.17B
2	Segra Capital Management, LLC	16.96%	1,612,726	$42.1M
3	Brightline Capital Management, LLC	10.77%	1,396,000	$36.4M
4	Arvin Capital Management LP	6.59%	2,071,200	$54.0M
5	Grizzlyrock Capital, LLC	5.97%	289,113	$7.5M
6	AWH Capital, L.P.	5.57%	235,250	$6.1M
7	Permian Investment Partners, LP	4.52%	1,567,000	$40.9M
8	Hyperion Capital Advisors LP	3.81%	303,576	$7.9M
9	Soviero Asset Management, LP	3.13%	240,000	$6.3M
10	Avenir Corp	2.67%	841,099	$21.9M
11	Segra Capital Management, LLC	2.10%	200,000	$5.2M
12	Arvin Capital Management LP	1.90%	596,500	$15.6M
13	Troluce Capital Advisors LLC	1.60%	1,000,000	$26.1M
14	Hudson Value Partners, LLC	1.59%	203,910	$5.3M
15	Ridge Creek Global, Inc	1.56%	70,548	$1.8M
16	Penn Capital Management Company, LLC	1.41%	694,352	$18.2M
17	Cacti Asset Management LLC	1.39%	881,692	$23.0M
18	Frontier Capital Management Co LLC	1.32%	4,930,210	$128.6M
19	Soviero Asset Management, LP	1.30%	100,000	$2.6M
20	De Lisle Partners LLP	1.18%	379,818	$9.9M
21	683 Capital Management, LLC	1.05%	775,000	$20.2M
22	Rovida Investment Management Ltd	1.03%	315,000	$8.2M
23	Hahn Capital Management LLC	0.84%	51,120	$1.3M
24	Ruane, Cunniff & Goldfarb L.P.	0.70%	1,622,982	$42.3M
25	Steadtrust LLC	0.67%	45,400	$1.2M

Investor	Ownership History	% of Portfolio	Prev %	Rank	Conviction	Avg Buy Price	13F Score™ 3Y / 7Y	Sell Timing	Shares	Mkt Value	Change	Change %	Source	Quarter	Filed

Frequently Asked Questions — Amentum Holdings Inc (AMTM)

What does the Smart Money Trend signal show for AMTM?

Buying streak — 2 quarters in a row: For 2 consecutive quarters, more hedge funds added AMTM than sold it. That's a consistent pattern of professional buying — not a one-time trade. When institutions keep buying quarter after quarter, it usually means they see a multi-year opportunity, not just a short-term momentum flip.

What is the institutional breadth score for AMTM?

Slight buying edge — 50% buying: Last quarter: 226 funds bought or added vs 226 that reduced or exited. It's nearly a 50/50 split — some institutions are convinced, others are taking profits. This mixed picture is normal near price highs.

What is the fund quality score for AMTM holders?

Strong quality — 35% AUM from major funds: 49 of 482 holders rank in the top 100 by AUM, accounting for 35% of total institutional value held. A meaningful share of the ownership value comes from the most well-resourced institutions.

How long have hedge funds held AMTM?

Mostly new holders — 28% entered in last year: Only 14 funds (3%) have held >2 years. The majority of current holders are relatively new to the position. New holders tend to sell faster when prices drop — a shallow conviction base that could amplify any sell-off.

Is it too late to buy Amentum Holdings Inc (AMTM) following the 2026 Q1 hedge fund 13F filings?

As of today, AMTM has moved nan% since the 2026 Q1 13F filing date (May 15, 2026), compared to +4.8% for the XLI sector ETF — an outperformance of nan%. Since the quarter end (March 31, 2026), AMTM has gained nan% vs +11.0% for XLI. The stock is tracking its sector benchmark closely. The signal remains fresh and the entry point is still near the fund's implied reference.

Where does this institutional ownership data come from?

All holdings data is sourced from SEC Form 13F filings, which institutional investment managers with over $100 million in assets are required to submit quarterly. Data is parsed directly from SEC EDGAR.

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Amentum Holdings Inc (AMTM)

Smart Money Signals — AMTM

Buying streak — 2 quarters in a row

At the ownership peak (100% of max)

Steady growth — +20% more funds vs a year ago

Slight buying edge — 50% buying

Fewer new buyers each quarter (-21 vs last Q)

Mostly new holders — 28% entered in last year

Steady discovery — ~74 new funds/quarter

Mixed cohorts — 2% veterans, 33% new entrants

Strong quality — 35% AUM from major funds

Institutional Sentiment Summary — AMTM

Hedge Fund Ownership: AMTM

Market Analysis: AMTM

Analyst Price Targets

Analyst Recommendations

Stock Performance

Company Profile: AMTM

Is It Too Late to Buy Amentum Holdings Inc (AMTM) Based on Hedge Fund 13F Filings?

Hedge Fund Positioning: AMTM

Statistics: AMTM

Valuation Measures Data as of: --

Financial Highlights

Institutional Holders (2026 Q1)

Frequently Asked Questions — Amentum Holdings Inc (AMTM)

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