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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
NCNO icon
9951
nCino
NCNO
$2.44B
– –
-4,716
Closed -$77.4K
NEWT icon
9952
PUT
NewtekOne
NEWT
$359M
– –
-2,300
Closed -$25.2K
NEXN
9953
CALL
Nexxen International
NEXN
$544M
– –
-5,800
Closed -$37.8K
NEXN
9954
PUT
Nexxen International
NEXN
$544M
– –
-100
Closed -$652
NFLX icon
9955
Netflix
NFLX
$326B
– –
-184,871
Closed -$16.3M
NFTY icon
9956
First Trust India Nifty 50 Equal Weight ETF
NFTY
$117M
– –
-3,602
Closed -$185K
NGG icon
9957
National Grid
NGG
$78.5B
– –
-7,103
Closed -$604K
NGL icon
9958
NGL Energy Partners
NGL
$2.22B
– –
-37,418
Closed -$582K
NGNE icon
9959
Neurogene
NGNE
$772M
– –
-89
Closed -$2.45K
NGS icon
9960
Natural Gas Services Group
NGS
$469M
– –
-33,348
Closed -$1.36M
NGS icon
9961
PUT
Natural Gas Services Group
NGS
$469M
– –
-200
Closed -$7.55K
NGVC icon
9962
Vitamin Cottage Natural Grocers
NGVC
$644M
– –
-784
Closed -$20.3K
NGVT icon
9963
Ingevity
NGVT
$2.43B
– –
-12
Closed -$864
NHC icon
9964
CALL
National Healthcare
NHC
$3.42B
– –
-200
Closed -$31.9K
NHC icon
9965
National Healthcare
NHC
$3.42B
– –
-81
Closed -$12.9K
NHC icon
9966
PUT
National Healthcare
NHC
$3.42B
– –
-200
Closed -$31.9K
NMG
9967
Nouveau Monde Graphite
NMG
$461M
– –
-10,670
Closed -$20.2K
NNI icon
9968
CALL
Nelnet
NNI
$4.56B
– –
-700
Closed -$90.3K
NNI icon
9969
PUT
Nelnet
NNI
$4.56B
– –
-100
Closed -$12.9K
NOA
9970
CALL
North American Construction
NOA
$359M
– –
-1,000
Closed -$13.5K
NOA
9971
PUT
North American Construction
NOA
$359M
– –
-100
Closed -$1.35K
NOAH
9972
Noah Holdings
NOAH
$579M
– –
-875
Closed -$8.66K
NOAH
9973
PUT
Noah Holdings
NOAH
$579M
– –
-400
Closed -$3.96K
NOC icon
9974
Northrop Grumman
NOC
$73.2B
– –
-1,545
Closed -$891K
NOG icon
9975
Northern Oil and Gas
NOG
$2.76B
– –
-2,995
Closed -$71K
397 398
399
400 401

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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.