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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
GMAB icon
1226
CALL
Genmab
GMAB
$33.1B
$4.78M ﹤0.01%
133,900
-124,400
-48% -$3.94M
2023 Q1
14 quarters
RDW icon
1227
PUT
Redwire
RDW
$2.1B
$4.78M ﹤0.01%
457,500
+83,800
+22% +$905K
2021 Q4
19 quarters
KGC icon
1228
PUT
Kinross Gold
KGC
$25.3B
$4.77M ﹤0.01%
198,200
+65,700
+50% +$1.76M
2021 Q2
21 quarters
SEDG icon
1229
CALL
SolarEdge
SEDG
$1.65B
$4.77M ﹤0.01%
149,700
+38,200
+34% +$1.5M
2021 Q2
21 quarters
BNY icon
1230
Bank of New York Mellon
BNY
$103B
$4.77M ﹤0.01%
+32,947
New +$5.18M
2026 Q3
0 quarters
LI icon
1231
CALL
Li Auto
LI
$11.9B
$4.76M ﹤0.01%
419,100
+33,000
+9% +$406K
2020 Q3
24 quarters
CP icon
1232
CALL
Canadian Pacific Kansas City
CP
$81.5B
$4.76M ﹤0.01%
55,900
+25,000
+81% +$2.27M
2026 Q1
2 quarters
EXK icon
1233
CALL
Endeavour Silver
EXK
$2.4B
$4.75M ﹤0.01%
553,900
+56,900
+11% +$533K
2018 Q1
34 quarters
BBAI icon
1234
CALL
BigBear.ai
BBAI
$1.11B
$4.75M ﹤0.01%
1,792,300
+288,400
+19% +$869K
2021 Q4
19 quarters
CASY icon
1235
PUT
Casey's General Stores
CASY
$26.4B
$4.75M ﹤0.01%
7,800
+6,400
+457% +$4.94M
2015 Q4
43 quarters
MXL icon
1236
CALL
MaxLinear
MXL
$5.44B
$4.74M ﹤0.01%
52,500
-49,400
-48% -$3.74M
2020 Q1
26 quarters
PURR icon
1237
Hyperliquid Strategies Inc
PURR
$1.81B
$4.74M ﹤0.01%
386,218
+261,679
+210% +$2.45M
2026 Q1
2 quarters
EH icon
1238
CALL
EHang Holdings
EH
$302M
$4.73M ﹤0.01%
1,120,700
+43,500
+4% +$223K
2021 Q1
22 quarters
BAND icon
1239
CALL
Bandwidth Inc
BAND
$1.56B
$4.72M ﹤0.01%
77,800
+65,700
+543% +$3.64M
2020 Q1
26 quarters
REW icon
1240
PUT
Proshares UltraShort Technology
REW
$4.67M
$4.71M ﹤0.01%
281,300
+115,700
+70% +$1.37M
2019 Q2
29 quarters
TRI icon
1241
PUT
Thomson Reuters
TRI
$47.2B
$4.71M ﹤0.01%
48,400
+500
+1% +$49.5K
2025 Q2
5 quarters
LMND icon
1242
PUT
Lemonade
LMND
$3.17B
$4.7M ﹤0.01%
104,200
-4,600
-4% -$256K
2020 Q3
24 quarters
ARGX icon
1243
PUT
argenx
ARGX
$61.5B
$4.7M ﹤0.01%
4,900
+2,800
+133% +$2.63M
2020 Q4
23 quarters
ERAS icon
1244
CALL
Erasca
ERAS
$5.88B
$4.7M ﹤0.01%
320,300
+53,300
+20% +$933K
2024 Q2
9 quarters
FIVN icon
1245
CALL
FIVE9
FIVN
$2.1B
$4.69M ﹤0.01%
137,800
-61,300
-31% -$1.86M
2016 Q3
40 quarters
BNO icon
1246
PUT
United States Brent Oil Fund
BNO
$728M
$4.68M ﹤0.01%
77,900
+3,900
+5% +$203K
2018 Q1
34 quarters
SYF icon
1247
PUT
Synchrony
SYF
$23.4B
$4.68M ﹤0.01%
65,900
+38,800
+143% +$2.95M
2014 Q4
47 quarters
EGO icon
1248
CALL
Eldorado Gold
EGO
$8.74B
$4.67M ﹤0.01%
121,300
-11,600
-9% -$439K
2018 Q2
33 quarters
MGNI icon
1249
CALL
Magnite
MGNI
$4.19B
$4.66M ﹤0.01%
184,600
+117,100
+173% +$2.63M
2018 Q2
33 quarters
WIX icon
1250
PUT
WIX.com
WIX
$2.86B
$4.66M ﹤0.01%
64,600
+46,500
+257% +$3.17M
2017 Q2
37 quarters
48 49
50
51 52

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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.