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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
NRG icon
1151
CALL
NRG Energy
NRG
$20.5B
$5.28M ﹤0.01%
55,200
-1,100
-2% -$133K
2021 Q2
21 quarters
KYMR icon
1152
CALL
Kymera Therapeutics
KYMR
$11.5B
$5.28M ﹤0.01%
47,200
+5,100
+12% +$584K
2021 Q2
21 quarters
PRU icon
1153
CALL
Prudential Financial
PRU
$42.2B
$5.27M ﹤0.01%
46,400
-1,700
-4% -$203K
2014 Q4
47 quarters
QXO icon
1154
PUT
QXO Inc
QXO
$14.3B
$5.27M ﹤0.01%
450,500
+273,600
+155% +$3.76M
2024 Q3
8 quarters
PINS icon
1155
CALL
Pinterest
PINS
$11B
$5.26M ﹤0.01%
278,600
-151,000
-35% -$3.31M
2019 Q2
29 quarters
SLV icon
1156
iShares Silver Trust
SLV
$25.1B
$5.26M ﹤0.01%
96,534
+36,718
+61% +$2.08M
2026 Q2
1 quarter
EQX icon
1157
CALL
Equinox Gold
EQX
$12.6B
$5.25M ﹤0.01%
472,800
+41,200
+10% +$459K
2020 Q2
25 quarters
ARCC icon
1158
CALL
Ares Capital
ARCC
$14.1B
$5.25M ﹤0.01%
275,000
+27,800
+11% +$538K
2016 Q3
40 quarters
CDNS icon
1159
PUT
Cadence Design Systems
CDNS
$90.3B
$5.25M ﹤0.01%
15,900
-8,900
-36% -$2.92M
2018 Q1
34 quarters
ASX icon
1160
PUT
ASE Group
ASX
$83.5B
$5.25M ﹤0.01%
118,000
+46,900
+66% +$1.84M
2024 Q1
10 quarters
PAGP icon
1161
PUT
Plains GP Holdings
PAGP
$5.13B
$5.24M ﹤0.01%
202,300
+189,100
+1,433% +$4.99M
2018 Q2
33 quarters
HUT icon
1162
Hut 8
HUT
$7.33B
$5.23M ﹤0.01%
60,776
-48,246
-44% -$4.57M
2026 Q2
1 quarter
BIRK icon
1163
PUT
Birkenstock
BIRK
$6.05B
$5.23M ﹤0.01%
161,400
+65,900
+69% +$2.47M
2023 Q4
11 quarters
PNC icon
1164
PUT
PNC Financial Services
PNC
$92.2B
$5.22M ﹤0.01%
23,500
+800
+4% +$196K
2014 Q4
47 quarters
URNM icon
1165
CALL
Sprott Uranium Miners ETF
URNM
$1.74B
$5.21M ﹤0.01%
115,500
-159,500
-58% -$8.41M
2025 Q2
5 quarters
KGC icon
1166
CALL
Kinross Gold
KGC
$25.3B
$5.21M ﹤0.01%
216,300
+88,600
+69% +$2.37M
2021 Q2
21 quarters
SKYD icon
1167
PUT
Skydance Corporation
SKYD
$39.8B
$5.21M ﹤0.01%
504,100
-134,400
-21% -$1.31M
2025 Q3
4 quarters
CAH icon
1168
CALL
Cardinal Health
CAH
$64.1B
$5.21M ﹤0.01%
23,400
+11,700
+100% +$2.72M
2021 Q2
21 quarters
GEHC icon
1169
CALL
GE HealthCare
GEHC
$37.3B
$5.2M ﹤0.01%
79,600
-50,100
-39% -$3.39M
2026 Q1
2 quarters
SCCO icon
1170
PUT
Southern Copper
SCCO
$147B
$5.19M ﹤0.01%
25,871
+1,019
+4% +$193K
2018 Q3
32 quarters
CME icon
1171
PUT
CME Group
CME
$113B
$5.19M ﹤0.01%
19,800
+300
+2% +$79.1K
2014 Q4
47 quarters
NLY icon
1172
PUT
Annaly Capital Management
NLY
$14.4B
$5.19M ﹤0.01%
274,500
+138,200
+101% +$3.1M
2026 Q1
2 quarters
EXPE icon
1173
PUT
Expedia Group
EXPE
$30.8B
$5.16M ﹤0.01%
19,600
-22,800
-54% -$6.64M
2021 Q1
22 quarters
MTD icon
1174
Mettler-Toledo International
MTD
$34.8B
$5.15M ﹤0.01%
3,411
+2,084
+157% +$2.87M
2026 Q2
1 quarter
OUST icon
1175
PUT
Ouster
OUST
$2.79B
$5.15M ﹤0.01%
127,600
+6,700
+6% +$266K
2021 Q1
22 quarters
45 46
47
48 49

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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.