We are live on ! Find out more
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
SNOW icon
126
CALL
Snowflake
SNOW
$103B
$116M 0.06%
340,600
-11,400
-3% -$3.52M
2021 Q1
22 quarters
KFYP
127
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
$115M 0.06%
4,698,100
-3,554,600
-43% -$87M
2017 Q1
38 quarters
COIN icon
128
CALL
Coinbase
COIN
$36B
$113M 0.06%
606,300
+4,300
+0.7% +$730K
2021 Q2
21 quarters
GEV icon
129
PUT
GE Vernova
GEV
$220B
$113M 0.06%
118,700
-5,700
-5% -$5.65M
2024 Q2
9 quarters
WDC icon
130
PUT
Western Digital
WDC
$108B
$110M 0.06%
248,400
-8,700
-3% -$4.23M
2014 Q4
47 quarters
LRCX icon
131
PUT
Lam Research
LRCX
$277B
$109M 0.06%
332,600
+25,300
+8% +$7.9M
2014 Q4
47 quarters
PANW icon
132
PUT
Palo Alto Networks
PANW
$271B
$109M 0.06%
273,700
-95,000
-26% -$33.8M
2014 Q4
47 quarters
CRM icon
133
PUT
Salesforce
CRM
$177B
$108M 0.06%
471,500
-12,400
-3% -$2.56M
2014 Q4
47 quarters
CRM icon
134
CALL
Salesforce
CRM
$177B
$107M 0.06%
465,600
-193,300
-29% -$39.9M
2014 Q4
47 quarters
ETHA icon
135
CALL
iShares Ethereum Trust ETF
ETHA
$6.4B
$106M 0.06%
1,752,333
+939,700
+116% +$46.1M
2025 Q2
5 quarters
LITE icon
136
CALL
Lumentum
LITE
$54.1B
$104M 0.06%
106,900
+7,500
+8% +$6.34M
2021 Q1
22 quarters
CSCO icon
137
CALL
Cisco
CSCO
$389B
$104M 0.06%
963,600
-430,800
-31% -$48.5M
2021 Q1
22 quarters
WMT icon
138
PUT
Walmart Inc
WMT
$997B
$102M 0.06%
982,100
+305,800
+45% +$33.6M
2021 Q2
21 quarters
IREN icon
139
PUT
Iris Energy
IREN
$9.09B
$101M 0.05%
2,467,200
-170,800
-6% -$7.01M
2022 Q3
16 quarters
CAT icon
140
PUT
Caterpillar
CAT
$274B
$101M 0.05%
124,300
-28,600
-19% -$24.3M
2014 Q4
47 quarters
LLY icon
141
PUT
Eli Lilly
LLY
$1.26T
$100M 0.05%
86,800
+3,100
+4% +$3.66M
2014 Q4
47 quarters
NVO icon
142
CALL
Novo Nordisk
NVO
$182B
$100M 0.05%
2,637,200
+136,800
+5% +$6.31M
2014 Q4
47 quarters
DIS icon
143
CALL
Walt Disney
DIS
$206B
$99.4M 0.05%
947,900
+58,100
+7% +$5.95M
2021 Q2
21 quarters
LLY icon
144
CALL
Eli Lilly
LLY
$1.26T
$98.6M 0.05%
85,200
+1,900
+2% +$2.24M
2014 Q4
47 quarters
KO icon
145
CALL
Coca-Cola
KO
$413B
$96.1M 0.05%
1,116,400
+331,400
+42% +$28.7M
2021 Q2
21 quarters
CVX icon
146
CALL
Chevron
CVX
$411B
$95.4M 0.05%
467,000
-101,400
-18% -$20M
2014 Q4
47 quarters
VOO icon
147
CALL
Vanguard S&P 500 ETF
VOO
$1.04T
$94.3M 0.05%
213,400
-47,200
-18% -$33M
2014 Q4
47 quarters
QCOM icon
148
CALL
Qualcomm
QCOM
$183B
$93.9M 0.05%
510,200
-114,300
-18% -$19.8M
2021 Q2
21 quarters
SMCI icon
149
CALL
Super Micro Computer
SMCI
$18.8B
$93.5M 0.05%
2,275,400
-210,300
-8% -$7.15M
2021 Q4
19 quarters
STX icon
150
CALL
Seagate
STX
$116B
$93.2M 0.05%
101,100
+22,700
+29% +$19.4M
2026 Q1
2 quarters
4 5
6
7 8

Similar funds

Canada Pension Plan Investment Board
Canada Pension Plan Investment Board Toronto Ontario, Ontario, Canada $181B AUM 41.77% 1-Year Est. Return
Northwestern Mutual Wealth Management
Northwestern Mutual Wealth Management Milwaukee, Wisconsin $187B AUM 21.7% 1-Year Est. Return
SG Americas Securities
SG Americas Securities New York $179B AUM 65.34% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $178B AUM 37.23% 1-Year Est. Return
California Public Employees Retirement System
California Public Employees Retirement System Sacramento, California $177B AUM 39.86% 1-Year Est. Return
Dodge & Cox
Dodge & Cox San Francisco, California $191B AUM 17.5% 1-Year Est. Return
Swiss National Bank
Swiss National Bank Zurich, Switzerland $191B AUM 45.21% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return

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.