CPST

Calamos S&P 500 Alt SeptETF$28.13 0.16%
UnclassifiedCUSIP 12811T886· EOD Sep 4, 2026

Among active 13F managers last quarter, 1 opened and 1 added, while 5 reduced; the largest holder to move was Calamos Advisors LLC (−20%).

Tracked 13F holders
15
8 in Q2 2026 filings
13F value (tracked)
$18.7M
13F moves · latest Q
2 added
5 reduced

Price & smart-money activity

$28.13 0.16%2Y +13.7%
$24.40$25.42$26.43$27.44$28.4620242025202634422526522452
Hover for who · click for detailEnd-of-day closing prices52w $26.59 – $28.18

Who owns CPST?

15 tracked 13F filers · ranked by shares held

15 tracked 13F filers disclose a position in CPST as of the latest SEC 13F filings, a combined $18.7M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

#FundSharesPosition valueLast moveAs ofHistory
1Calamos Advisors LLC345K
$9.6M
−20%
Reduced · −88K sh
Q2 2026
2Osaic Holdings, Inc.104K
$2.8M
−4.5%
Reduced · −5K sh
Q1 2026
3Calamos Wealth Management LLC98K
$2.7M
−4.5%
Reduced · −5K sh
Q2 2026
4Old Mission Capital LLC29K
$770K
+0.1%
Added · +43 sh
Q1 2026
5Commonwealth Equity Services, LLC20K
$553K
Held
Q1 2026
6Susquehanna International Group, LLP19K
$519K
New
+19K sh
Q1 2026
7Blue Water Asset Management16K
$450K
−2.2%
Reduced · −362 sh
Q2 2026
8Harbour Investments, Inc.12K
$312K
−25%
Reduced · −4K sh
Q1 2026
9Spartan Wealth Advisory Services LLC11K
$298K
Held
Q2 2026
10Grantvest Financial Group LLC9K
$258K
−24%
Reduced · −3K sh
Q2 2026
11Sterling Financial Planning, Inc.8K
$223K
Held
Q2 2026
12Innovative Asset Advisors Group, LLC4K
$112K
New
+4K sh
Q2 2026
13Burkett Financial Services, LLC3K
$95K
−53%
Reduced · −4K sh
Q2 2026
14Creative Financial Designs Inc301
$8K
Held
Q2 2026
15UBS Group AG37
$998
−80%
Reduced · −152 sh
Q1 2026

Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

Is CPST being bought or sold by institutions?

Last quarter, 1 fund opened a new position in CPST and 1 added to an existing one, while 5 reduced. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).

Opened
1
fund took a first position
Added
1
added to an existing position
Reduced
5
reduced, still holding
Biggest moves · ranked by size of the change, positions above a floor

Funds that own CPST also own

CompanyCo-held byTheir position there
Nvidia CorpNVDA8 funds$1.5B
Apple IncAAPL7 funds$1.3B
Microsoft CorpMSFT7 funds$825.3M
Amazon.com IncAMZN7 funds$792.9M
SS SPDR S&P 500 ETF Trust-USSPY7 funds$422.1M
Tesla IncTSLA7 funds$374.7M
Invesco QQQ Trust Series 1QQQ7 funds$263.4M
JPMorgan Chase & CoJPM7 funds$255.8M
Caterpillar IncCAT7 funds$202.5M
Johnson & JohnsonJNJ7 funds$188.5M
Coca-Cola CoKO7 funds$93.2M
Vanguard Total Stock MKT ETFVTI7 funds$65.6M

Ranked by how many of CPST's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in CPST.

Institutional ownership over time

8 tracked filers in Q2 2026 filingsstill filing
0815Q3 2024Q1 2025Q3 2025Q1 2026Q2 2026
tracked filers holding their reported valueQ2 2026 filings so far: $13.5M
Each bar counts tracked filers with a position in that quarter's filings, so the newest bar excludes filers still on an earlier quarter. Arkolith's tracked universe has grown over this window; part of any long-run rise is coverage, not new buyers.

Share classes

Class13F holdersValue held
CAIEmc153 funds$516.8M
CAIQmc55 funds$115.9M
CAGEETF32 funds$20.7M
CPSLLADDERED S&P 500 ETF29 funds$56.6M
CPSMmc29 funds$27.3M
CPSDS&P 500 STRUCTU29 funds$26.8M
CPSJS&P 500 STR JULY29 funds$23.4M
CPNJmc29 funds$10.3M

Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.

Recent filings

15 most recent

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Connected entities for CPST

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Ask your agent what changed in CPST

This ETF page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.

Copy-paste
curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://arkolith.com/api/v1/stocks/CPST/capital-change-brief"
Ask your agent
Use Arkolith's capital_change_brief for CPST.
Tell me what changed, whether insider activity
corroborates it, and cite the SEC evidence.

13F holdings + quarter-over-quarter ownership changes + end-of-day price history + the live filing stream, joined for CPST. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.