Amentum Holdings Inc
$19.90-0.5%
+$369.6M
Net Activity
+5.54% total shares
Institutions Holding
465
Popularity Rank
#1280
Avg Weight
0.18%
Total Value
$4.6B
465 institutions currently hold AMTM, with 203 net buyers and 236 net sellers this quarter.
Institutional Moves (Q2 2026)
Neutral
Based on recent trading activity
Net Selling Institutions
236
Net Buying Institutions
203
Top 5 by Value
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Across its top 20 institutional holders, AMTM's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 17/100, avg. turnover score 46/100).
AMTM ranks #1280 out of 37501 tracked stocks by institutional interest — one of the most closely watched names in our coverage.
AMTM is a top-conviction position for American Securities LLC — at 24.8% of their entire disclosed 13F portfolio, it's one of their largest single bets, not just a passing allocation.
California State Teachers Retirement System has added to its AMTM position for two straight quarters, increasing it by $178.9M to reach $183.2M today.
American Securities LLC has trimmed its AMTM position for two straight quarters, cutting it by $375.1M while still holding $930.7M.
AMTM is down 0.5% today, but institutions show net buying of $369.6M this quarter — a divergence between today's price move and the underlying institutional flow.
AMTM posted net income of $204.0M over the trailing twelve months.
+$1.2B
Total Buy Value
$441.4M
Total Sell Value
203
Net Buyers
236
Net Sellers
AMTM
Q2 2026
Top 5 Institutional Movers
AMTM does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.
13F data as of 2026-06-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.
No Form 144 planned sale filings in the last 90 days
No Schedule 13D/13G filings for this ticker
1
Filings (14d)
Amentum Holdings (ticker: AMTM) released its third-quarter financial results for the period ended July 3, 2026, on August 10, 2026. The 8-K includes the press release and references a conference call and webcast scheduled for August 11, 2026. No specific revenue or profit figures appear in this excerpt, so this is essentially a routine earnings disclosure.
View Full Filing (SEC EDGAR)023939101
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Access AMTM's institutional ownership data programmatically:
REST API
curl https://alphasmo.com/api/v1/market/stock/AMTMCLI
npx alphasmo stocks get AMTM