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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
CPB icon
2126
Campbell Soup
CPB
$6.65B
$1.79M ﹤0.01%
90,255
+24,647
+38% +$546K
2024 Q1
10 quarters
RRC icon
2127
CALL
Range Resources
RRC
$12.1B
$1.79M ﹤0.01%
48,300
+1,700
+4% +$66.8K
2014 Q4
47 quarters
ETHU icon
2128
2x Ether ETF
ETHU
$731M
$1.79M ﹤0.01%
+59,743
New +$1.26M
2026 Q3
0 quarters
QNT icon
2129
CALL
Quantinuum Inc
QNT
$1.76B
$1.79M ﹤0.01%
37,200
-2,100
-5% -$119K
2026 Q2
1 quarter
RUM icon
2130
RUM Group Inc
RUM
$2.38B
$1.79M ﹤0.01%
+236,449
New +$1.75M
2026 Q3
0 quarters
LODE icon
2131
PUT
Comstock
LODE
$127M
$1.78M ﹤0.01%
768,400
-100,600
-12% -$332K
2024 Q3
8 quarters
SOPH icon
2132
CALL
SOPHiA GENETICS
SOPH
$639M
$1.78M ﹤0.01%
212,700
-81,500
-28% -$587K
2026 Q1
2 quarters
TFIN icon
2133
PUT
Triumph Financial Inc
TFIN
$1.45B
$1.78M ﹤0.01%
29,700
– –
2025 Q4
3 quarters
SKM icon
2134
PUT
SK Telecom
SKM
$13.2B
$1.78M ﹤0.01%
51,000
-7,900
-13% -$279K
2025 Q3
4 quarters
LI icon
2135
PUT
Li Auto
LI
$11.9B
$1.78M ﹤0.01%
156,700
+7,100
+5% +$87.3K
2020 Q3
24 quarters
FBTC icon
2136
PUT
Fidelity Wise Origin Bitcoin Fund
FBTC
$13.8B
$1.78M ﹤0.01%
24,500
-2,600
-10% -$161K
2026 Q1
2 quarters
AAOI icon
2137
Applied Optoelectronics
AAOI
$5.07B
$1.78M ﹤0.01%
17,901
+17,482
+4,172% +$1.96M
2025 Q3
4 quarters
CRMU icon
2138
CALL
DELISTED
Leverage Shares 2x Long CRML Daily ETF
CRMU
$1.78M ﹤0.01%
220,800
-37,900
-15% -$94K
2026 Q1
2 quarters
TLRY icon
2139
PUT
Tilray
TLRY
$386M
$1.77M ﹤0.01%
473,100
+53,500
+13% +$233K
2018 Q3
32 quarters
CRK icon
2140
CALL
Comstock Resources
CRK
$4.44B
$1.77M ﹤0.01%
143,900
+88,300
+159% +$1.21M
2017 Q4
35 quarters
RARE icon
2141
CALL
Ultragenyx Pharmaceutical
RARE
$1.7B
$1.77M ﹤0.01%
117,900
+112,600
+2,125% +$2.7M
2026 Q1
2 quarters
ESLT icon
2142
Elbit Systems
ESLT
$34B
$1.77M ﹤0.01%
2,597
-2,786
-52% -$2.12M
2024 Q3
8 quarters
BSOL icon
2143
Bitwise Solana Staking ETF
BSOL
$694M
$1.77M ﹤0.01%
109,592
+95,265
+665% +$1.17M
2025 Q4
3 quarters
DB icon
2144
PUT
Deutsche Bank
DB
$69.2B
$1.77M ﹤0.01%
49,300
-103,300
-68% -$3.88M
2021 Q1
22 quarters
HUBB icon
2145
CALL
Hubbell
HUBB
$23.4B
$1.77M ﹤0.01%
3,900
-3,900
-50% -$1.85M
2026 Q2
1 quarter
CHYM icon
2146
PUT
Chime Financial
CHYM
$12.7B
$1.77M ﹤0.01%
66,400
+51,200
+337% +$1.42M
2025 Q2
5 quarters
LION icon
2147
CALL
Lionsgate Studios
LION
$4.32B
$1.77M ﹤0.01%
157,900
+49,500
+46% +$609K
2025 Q2
5 quarters
SO icon
2148
Southern Company
SO
$109B
$1.77M ﹤0.01%
21,318
+8,234
+63% +$750K
2026 Q2
1 quarter
MTSI icon
2149
PUT
MACOM Technology Solutions
MTSI
$19.1B
$1.77M ﹤0.01%
6,200
+400
+7% +$112K
2026 Q1
2 quarters
UAMY icon
2150
CALL
United States Antimony
UAMY
$467M
$1.76M ﹤0.01%
422,800
+123,200
+41% +$673K
2024 Q4
7 quarters
84 85
86
87 88

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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.