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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
Cap. Flow
-$29.5M
Cap. Flow %
-0.02%
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$146M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$108M
3
AAPL icon
Apple
AAPL
+$62.9M
4
TSLA icon
Tesla
TSLA
+$51.9M
5
MU icon
Micron Technology
MU
+$39.5M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$108M
2
META icon
Meta Platforms (Facebook)
META
+$104M
3
AMD icon
Advanced Micro Devices
AMD
+$92.1M
4
AMZN icon
Amazon
AMZN
+$90.3M
5
TSM icon
TSMC
TSM
+$82.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.28%
2 Technology 0.76%
3 Consumer Discretionary 0.21%
4 Communication Services 0.19%
5 Healthcare 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
FNGS icon
9601
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$606M
– –
-671
Closed -$48.1K
FNKO icon
9602
Funko
FNKO
$318M
– –
-12,775
Closed -$61.4K
FNLC icon
9603
First Bancorp
FNLC
$396M
– –
-83
Closed -$2.46K
FOA icon
9604
Finance of America Companies
FOA
$158M
– –
-11,268
Closed -$230K
FOA icon
9605
PUT
Finance of America Companies
FOA
$158M
– –
-600
Closed -$9.96K
FOLD
9606
CALL
DELISTED
Amicus Therapeutics
FOLD
– –
-6,200
Closed -$89.7K
FOLD
9607
PUT
DELISTED
Amicus Therapeutics
FOLD
– –
-19,500
Closed -$282K
FOR icon
9608
Forestar Group
FOR
$1.42B
– –
-87
Closed -$2.13K
FPH icon
9609
PUT
Five Point Holdings
FPH
$371M
– –
-400
Closed -$1.94K
FPX icon
9610
First Trust US Equity Opportunities ETF
FPX
$1.5B
– –
-17
Closed -$3.15K
FR icon
9611
CALL
First Industrial Realty Trust
FR
$8.2B
– –
-500
Closed -$28.9K
FSLY icon
9612
Fastly Inc
FSLY
$3.28B
– –
-39,355
Closed -$855K
FSP
9613
CALL
Franklin Street Properties
FSP
$42.1M
– –
-4,400
Closed -$2.93K
FSS icon
9614
Federal Signal
FSS
$7.28B
– –
-2
Closed -$229
FSS icon
9615
PUT
Federal Signal
FSS
$7.28B
– –
-900
Closed -$97.3K
FTCI icon
9616
FTC Solar
FTCI
$41.8M
– –
-1,375
Closed -$6.37K
FTCI icon
9617
PUT
FTC Solar
FTCI
$41.8M
– –
-900
Closed -$3.4K
FTDR icon
9618
CALL
Frontdoor
FTDR
$5.69B
– –
-100
Closed -$5.29K
FTI icon
9619
TechnipFMC
FTI
$31.3B
– –
-46,617
Closed -$3.3M
FUL icon
9620
CALL
H.B. Fuller
FUL
$2.9B
– –
-100
Closed -$6.17K
FUL icon
9621
H.B. Fuller
FUL
$2.9B
– –
-77
Closed -$4.74K
FULC icon
9622
Fulcrum Therapeutics
FULC
$294M
– –
-41,940
Closed -$255K
FULT icon
9623
Fulton Financial
FULT
$4.6B
– –
-118
Closed -$2.59K
FULT icon
9624
PUT
Fulton Financial
FULT
$4.6B
– –
-100
Closed -$2.03K
FXI icon
9625
iShares China Large-Cap ETF
FXI
$4.28B
– –
-159,011
Closed -$5.71M
383 384
385
386 387

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Simplex Trading's Q2 2026 Portfolio in Review

As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.

Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
  • Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
  • Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
  • Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
  • Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
  • Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.