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ETF comparison

IWO vs SPSM

Both US Small Cap.

iShares Russell 2000 Growth ETF · State Street SPDR Portfolio S&P 600 Small Cap ETF

Holdings overlap

Weighted by ISIN/CUSIP
38.6 %

290 positions appear in both funds. Buying equal dollars of IWO and SPSM would leave roughly 38.6% of each dollar exposed to the same underlying securities.

IWO only 74.9% Shared 38.6% SPSM only 61.1%
In IWO only
814 positions
Shared
290 positions
In SPSM only
315 positions

Side by side

IWO

iShares Russell 2000 Growth ETF

iShares · US Small Cap

86 composite / 100
Expense ratio
0.24%
Net assets
$15.43B
TTM yield
0.43%
Top-10 conc.
22.9%
SPSM

State Street SPDR Portfolio S&P 600 Small Cap ETF

State Street · US Small Cap

96 composite / 100
Expense ratio
0.030%
Net assets
$16.92B
TTM yield
1.38%
Top-10 conc.
10.5%

Sub-score comparison

76
Cost
97
90
Tax efficiency
88
100
Liquidity
100
82
Concentration
99
—
Tracking quality
—
IWO sub-score SPSM

Tracking quality isn't part of the composite — see what we don't score for why.

Cost difference

SPSM is 21 bps cheaper than IWO. On a $100,000 position that's about $210/yr more in fees for IWO.

Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with IWO vs SPSM.

Top shared holdings

290 shared in total
# Holding In IWO In SPSM Overlap
1 Viavi Solutions, Inc. 0.51% 0.50% 0.50%
2 Argan, Inc. 0.49% 0.49% 0.49%
3 Primoris Services Corp. 0.49% 0.51% 0.49%
4 ESCO Technologies, Inc. 0.49% 0.48% 0.48%
5 Semtech Corp. 0.48% 0.47% 0.47%
6 DigitalOcean Holdings, Inc. 0.44% 0.45% 0.44%
7 Zurn Elkay Water Solutions Corp. 0.45% 0.43% 0.43%
8 Federal Signal Corp. 0.44% 0.43% 0.43%
9 Krystal Biotech, Inc. 0.43% 0.44% 0.43%
10 Brinker International, Inc. 0.42% 0.41% 0.41%
11 Protagonist Therapeutics, Inc. 0.41% 0.40% 0.40%
12 Glaukos Corp. 0.40% 0.40% 0.40%

Only in IWO

814 total
  • BlackRock Funds III 13.68%
  • Bloom Energy Corp. 1.99%
  • Fabrinet 1.26%
  • Credo Technology Group Holding Ltd. 1.02%
  • Nextpower, Inc. 0.94%
  • Kratos Defense & Security Solutions, Inc. 0.86%
  • Advanced Energy Industries, Inc. 0.82%
  • Sterling Infrastructure, Inc. 0.81%
  • Bridgebio Pharma, Inc. 0.79%
  • Guardant Health, Inc. 0.77%

Only in SPSM

315 total
  • Eastman Chemical Co 0.57%
  • Element Solutions Inc 0.51%
  • LKQ Corp 0.49%
  • Jackson Financial Inc 0.49%
  • Match Group Inc 0.47%
  • Celanese Corp 0.47%
  • Armstrong World Industries Inc 0.46%
  • SM Energy Co 0.46%
  • Molina Healthcare Inc 0.45%
  • Air Lease Corp 0.45%

Open IWO or SPSM at a brokerage

Both funds trade commission-free at major US brokerages.

Open at Fidelity

Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.

Holdings overlap is the sum of min(weight_a, weight_b) over positions matched on ISIN (CUSIP fallback). Methodology: see /methodology/.

Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.