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Simplex Trading

Simplex Trading Portfolio holdings

AUM $184B Turnover 28.44%
1-Year Est. Return 51.71%
 

Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.

This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
Cap. Flow
-$519M
Cap. Flow %
-0.28%
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held Equity + Options
3 years
Top 10 Avg Time Held Equity + Options
3.9 years
Top 20 Avg Time Held Equity + Options
4.3 years
Avg Time Held Equity only
0.5 years
Top 10 Avg Time Held Equity only
0.5 years
Top 20 Avg Time Held Equity only
0.4 years

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$92.6M
2
HYG icon
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
+$80.6M
3
AMZN icon
Amazon
AMZN
+$26.3M
4
XLI icon
State Street Industrial Select Sector SPDR ETF
XLI
+$25.7M
5
GLD icon
SPDR Gold Trust
GLD
+$20.7M

Top Sells

Rank Stock Value
1
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$128M
2
NVDA icon
NVIDIA
NVDA
+$97.8M
3
TSLA icon
Tesla
TSLA
+$53.9M
4
MU icon
Micron Technology
MU
+$50M
5
USO icon
United States Oil Fund
USO
+$49.2M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.84%
2 Technology 0.45%
3 Consumer Discretionary 0.14%
4 Healthcare 0.14%
5 Financials 0.1%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow Held Since
MLYS icon
2976
Mineralys Therapeutics
MLYS
$1.37B
$817K ﹤0.01%
32,507
-3,472
-10% -$94.5K
2025 Q3
4 quarters
AIZ icon
2977
CALL
Assurant
AIZ
$15.8B
$817K ﹤0.01%
3,100
+2,700
+675% +$756K
2026 Q2
1 quarter
MSM icon
2978
PUT
MSC Industrial Direct
MSM
$6.67B
$817K ﹤0.01%
6,600
+4,900
+288% +$598K
2018 Q1
34 quarters
KYIV icon
2979
CALL
Kyivstar Group
KYIV
$2.99B
$813K ﹤0.01%
65,900
+55,800
+552% +$768K
2025 Q3
4 quarters
VIST icon
2980
Vista Energy
VIST
$6.13B
$813K ﹤0.01%
12,440
+3,704
+42% +$254K
2025 Q3
4 quarters
TEN icon
2981
PUT
Tsakos Energy Navigation Ltd
TEN
$1.42B
$813K ﹤0.01%
17,200
+6,600
+62% +$279K
2026 Q1
2 quarters
EXPD icon
2982
CALL
Expeditors International
EXPD
$25.3B
$812K ﹤0.01%
4,400
+2,200
+100% +$400K
2021 Q2
21 quarters
GEF icon
2983
Greif
GEF
$4.05B
$812K ﹤0.01%
10,197
+6,357
+166% +$523K
2025 Q1
6 quarters
AIPO icon
2984
Defiance AI & Power Infrastructure ETF
AIPO
$749M
$811K ﹤0.01%
28,761
+26,031
+954% +$764K
2026 Q2
1 quarter
LCUT icon
2985
CALL
Lifetime Brands
LCUT
$177M
$811K ﹤0.01%
94,300
+24,800
+36% +$218K
2026 Q1
2 quarters
AMZA icon
2986
CALL
InfraCap MLP ETF
AMZA
$459M
$808K ﹤0.01%
41,000
+20,600
+101% +$1.01M
2021 Q1
22 quarters
AGG icon
2987
iShares Core US Aggregate Bond ETF
AGG
$137B
$807K ﹤0.01%
+8,534
New +$829K
2026 Q3
0 quarters
JBHT icon
2988
CALL
JB Hunt Transport Services
JBHT
$21.2B
$807K ﹤0.01%
3,600
-200
-5% -$53.6K
2016 Q1
42 quarters
CENX icon
2989
PUT
Century Aluminum
CENX
$3.52B
$806K ﹤0.01%
22,400
+1,600
+8% +$70.8K
2021 Q2
21 quarters
SJM icon
2990
J.M. Smucker
SJM
$14.1B
$805K ﹤0.01%
6,766
-3,395
-33% -$408K
2026 Q1
2 quarters
FOUR icon
2991
Shift4
FOUR
$3.11B
$805K ﹤0.01%
22,243
+14,997
+207% +$691K
2026 Q2
1 quarter
TX icon
2992
Ternium
TX
$9.9B
$805K ﹤0.01%
14,816
+10,145
+217% +$526K
2026 Q1
2 quarters
LBTYA icon
2993
Liberty Global Class A
LBTYA
$3.54B
$804K ﹤0.01%
88,080
+47,463
+117% +$495K
2025 Q3
4 quarters
WSC icon
2994
WillScot Mobile Mini Holdings
WSC
$3.6B
$804K ﹤0.01%
46,807
+44,606
+2,027% +$1.01M
2025 Q2
5 quarters
OTIS icon
2995
PUT
Otis Worldwide
OTIS
$29.4B
$804K ﹤0.01%
12,500
-600
-5% -$42.7K
2020 Q2
25 quarters
IMVT icon
2996
PUT
Immunovant
IMVT
$7.25B
$804K ﹤0.01%
23,800
-74,000
-76% -$2.92M
2021 Q1
22 quarters
WSO icon
2997
Watsco Inc
WSO
$12.7B
$803K ﹤0.01%
2,654
+2,648
+44,133% +$885K
2025 Q3
4 quarters
STT icon
2998
PUT
State Street
STT
$47.3B
$803K ﹤0.01%
4,600
+4,400
+2,200% +$814K
2014 Q4
47 quarters
FLNG icon
2999
CALL
FLEX LNG
FLNG
$1.4B
$803K ﹤0.01%
26,100
– –
2022 Q1
18 quarters
KRP icon
3000
PUT
Kimbell Royalty Partners
KRP
$1.63B
$803K ﹤0.01%
56,200
-17,700
-24% -$263K
2020 Q4
23 quarters
118 119
120
121 122

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Jennison Associates
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Simplex Trading's Q3 2026 Portfolio in Review

As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
  • Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
  • Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
  • Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
  • Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
  • Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.

Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.