IVOO bid-ask spread and liquidity

Vanguard S&P Mid-Cap 400 ETF
StocksVanguard$3.7bn net assets0.07% fee
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As of Oct 22, 2026, IVOO closed +0.01% from its NAV, and on 95% of the 5 days to then it was within ±0.08%.

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Ask IQ about IVOO bid-ask spread and liquidity

Answers cite the figures on this page.

OverviewHoldingsDividendsTradingFlowsCompare

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 $1.5bn a day, Oct 22, 2026
100.0
Price fidelity
Not measured · 5 days of closing premium are held, under the 20 needed
·
Primary market
16 active dealers of 38; largest 15% of creations and redemptions, N-CEN to Aug 31, 2025
100.0
Bad-day behaviour
Not measured · 0 of the 10 worst days and 5 other days are held, under the 5 and 60 needed
·
Depth
Not measured · needs trade and quote data (Phase 2)
·

Premium or discount to value

Daily, 5 days to Oct 22, 2026 · the ±1% band marked
IVOO premium or discount to NAV, 5 days+1%0−1%Oct 16, 2026Oct 22, 2026
Latest close, Oct 22
+0.01%
95% of days within
±0.08%
Days more than 1% from NAV
0 of 5
Widest
+0.08%, Oct 20, 2026

Close against the NAV its issuer struck the same day, from the issuer. Source: ETFIQ.

Capacity

What the holdings can absorb a day, at 10% of each one’s volume
Holdings can absorb
$1.5bn

IVOO’s holdings can absorb $1.5bn a day, measured on its own holdings, as of Oct 22, 2026. A $1m order is 0.07% of a day’s capacity.

The holding that sets the limit: Donaldson Co Inc (DCI), 0.30% of the fund, $45m 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 Aug 31, 2025
Active dealers
16
of 38 authorized
Largest
15%
of creations and redemptions
One dealer
No
16 active

16 of 38 authorized participants created or redeemed IVOO shares in the year to Aug 31, 2025. From the fund’s Form N-CEN, filed Nov 12, 2025.

The active authorized participants, largest first, by share of the dollars created and redeemed: Citadel Securities LLC (15.0%), Merrill Lynch Professional Clearing Corp. (13.2%), RBC Capital Markets, LLC (12.9%), Barclays Capital Inc. (11.7%), Virtu Americas LLC (8.0%), Goldman Sachs & Co. LLC (7.6%), Jefferies LLC (7.3%), UBS Securities LLC (6.4%), Morgan Stanley & Co. LLC (5.4%), Cowen and Company, LLC (4.5%), Jane Street Capital, LLC (4.0%), Citigroup Global Markets Inc. (1.6%), Mizuho Securities USA LLC (1.0%), J.P. Morgan Securities LLC (0.6%), BNP Paribas Securities Corp. (0.5%), ABN AMRO Clearing USA LLC (0.3%). 22 more were listed and created or redeemed nothing.

How to trade IVOO

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 $15m is 1% of what its holdings can absorb in a day, for a buy or a sell.
Watch
The premium. On 95% of days it is within ±0.08%; beyond that a buyer pays more, and a seller gets less, than the holdings are worth.
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

Does IVOO trade at a premium or discount to NAV?

It closed +0.01% from its NAV on Oct 22, 2026. On 95% of the 5 days to then it was within ±0.08%, and it closed more than 1% from NAV on 0 of them.

Who is the AP for IVOO?

IVOO’s latest Form N-CEN, for the period ending Aug 31, 2025, lists 38 authorized participants (APs), and 16 created or redeemed shares. The largest were Citadel Securities LLC (15.0%), Merrill Lynch Professional Clearing Corp. (13.2%), RBC Capital Markets, LLC (12.9%) of the dollars its APs created and redeemed.

Who is the LMM for IVOO?

IVOO’s lead market maker (LMM) on NYSE Arca is Virtu Americas LLC. Lead market maker per NYSE Arca, as of Oct 23, 2026.
Sources and dates
Premium to NAVETFIQ, close against the issuer’s NAV · Oct 16, 2026 to Oct 22, 2026
CapacityETFIQ, each holding’s 20-day median dollar volume · to Oct 22, 2026
DealersForm N-CEN · the year to Aug 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 →IVOO fund page→
Cite this pageCitation, APA and Markdown

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

Open data →

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