CPSF bid-ask spread and liquidity

Calamos S&P 500 Structured Alt Protection ETF - February
BufferCalamos$35m net assets0.69% fee
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Ask IQ about CPSF bid-ask spread and liquidity

Answers cite the figures on this page.

OverviewTradingFlowsCompare

IQ Liquidity Score

2 of 6 measured · Oct 22, 2026
·
Not scored
0 · Hard to trade100 · Trades like a giant

The IQ Liquidity Score: a fixed 0 to 100 scale of trading conditions, the same anchors for every fund; 100 is the easiest to trade. It measures how cheaply and reliably the fund trades, not whether to own it. Method →

Cost to trade
Not measured · the issuer's 30-day median spread is not read for this fund
·
Capacity
Holdings can absorb $14.3bn a day, Oct 22, 2026
100.0
Price fidelity
Not measured · no closing premium is held for this fund
·
Primary market
3 active dealers of 7; largest 55% of creations and redemptions, N-CEN to Jul 31, 2025
65.0
Bad-day behaviour
Not measured · no daily closing premium is held for this fund
·
Depth
Not measured · needs trade and quote data (Phase 2)
·

Capacity

What the holdings can absorb a day, at 10% of each one’s volume
Holdings can absorb
$14.3bn

CPSF’s holdings can absorb $14.3bn a day, measured on the holdings of SPY, its reference asset, as of Oct 22, 2026. A $1m order is 0.0070% of a day’s capacity.

The holding that sets the limit: BERKSHIRE HATHAWAY INC CL B (BRK-B), 1.54% of the fund, $2.2bn a day traded, the median of 20 days to Oct 22, 2026. Capacity is the least of the holding-level ratios over the holdings making up 95% of the weight.

Dealers

Authorized participants · N-CEN, the year to Jul 31, 2025
Active dealers
3
of 7 authorized
Largest
55%
of creations and redemptions
One dealer
No
3 active

3 of 7 authorized participants created or redeemed CPSF shares in the year to Jul 31, 2025. From the fund’s Form N-CEN, filed Oct 14, 2025.

The active authorized participants, largest first, by share of the dollars created and redeemed: Merrill Lynch Professional Clearing Corp. (55.3%), Goldman Sachs & Co. LLC (42.9%), Jane Street Capital, LLC (1.8%). 4 more were listed and created or redeemed nothing.

How to trade CPSF

To buy or to sell, up to $100,000
When
ETF spreads are usually widest in the first minutes after the open and the last before the close.
Size
Up to $143m is 1% of what its holdings can absorb in a day, for a buy or a sell.
Phase 2 · drawn now, filled when trade data arrives
Spread through the dayComing with trade data

Median spread by half hour, 30 days.

Buyers against sellersComing with trade data

Share of volume at the ask against at the bid.

Retail flow, estimatedComing with trade data

Sub-penny prints as a share of volume.

Large tradesComing with trade data

Prints above $500k, count and share.

Closing auctionComing with trade data

Share of the day’s volume at the close.

Questions people ask

Who is the AP for CPSF?

CPSF’s latest Form N-CEN, for the period ending Jul 31, 2025, lists 7 authorized participants (APs), and 3 created or redeemed shares. The largest were Merrill Lynch Professional Clearing Corp. (55.3%), Goldman Sachs & Co. LLC (42.9%), Jane Street Capital, LLC (1.8%) of the dollars its APs created and redeemed.

Who is the LMM for CPSF?

CPSF’s lead market maker (LMM) on NYSE Arca is Wolverine Trading, LLC. Lead market maker per NYSE Arca, as of Oct 23, 2026.
Sources and dates
CapacityETFIQ, each holding’s 20-day median dollar volume · to Oct 22, 2026
DealersForm N-CEN · the year to Jul 31, 2025
Where to next
ETF trading costs and liquidity→Cost-to-trade checker→Why low volume does not mean illiquidguide →Limit orders vs market orders for ETFsguide →How the IQ Liquidity Score is builtmethod →CPSF fund page→
Cite this pageCitation, APA and Markdown

ETFIQ, CPSF trading: cost, capacity, premium and dealers, data as of Oct 22, 2026. https://etfiq.com/funds/cpsf/trading/

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The score measures trading conditions, not the fund. ETFIQ makes no recommendations.