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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
IEMG icon
601
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$148B
$14M 0.01%
137,800
-44,700
-24% -$3.6M
2020 Q1
26 quarters
RNG icon
602
PUT
RingCentral
RNG
$6.27B
$14M 0.01%
187,100
+178,300
+2,026% +$10.8M
2021 Q1
22 quarters
BHP icon
603
CALL
BHP
BHP
$209B
$13.9M 0.01%
164,400
-55,300
-25% -$4.82M
2015 Q1
46 quarters
JBL icon
604
PUT
Jabil
JBL
$26.7B
$13.9M 0.01%
48,600
+27,800
+134% +$8.88M
2017 Q1
38 quarters
CMCSA icon
605
PUT
Comcast
CMCSA
$88.8B
$13.9M 0.01%
640,600
+159,200
+33% +$3.9M
2016 Q1
42 quarters
APO icon
606
PUT
Apollo Global Management
APO
$72.6B
$13.9M 0.01%
120,000
-39,500
-25% -$5.01M
2015 Q1
46 quarters
RIO icon
607
CALL
Rio Tinto
RIO
$138B
$13.9M 0.01%
147,800
-73,600
-33% -$7.15M
2014 Q4
47 quarters
URA icon
608
Global X Uranium ETF
URA
$4.65B
$13.9M 0.01%
348,989
+61,223
+21% +$2.62M
2026 Q1
2 quarters
ABT icon
609
CALL
Abbott
ABT
$189B
$13.9M 0.01%
140,500
-42,100
-23% -$4.4M
2021 Q1
22 quarters
PSX icon
610
CALL
Phillips 66
PSX
$101B
$13.8M 0.01%
54,000
+20,500
+61% +$4.68M
2014 Q4
47 quarters
XPEV icon
611
CALL
XPeng
XPEV
$9.42B
$13.7M 0.01%
1,434,900
+381,800
+36% +$4.52M
2020 Q3
24 quarters
URI icon
612
CALL
United Rentals
URI
$71.3B
$13.7M 0.01%
13,700
+3,500
+34% +$3.73M
2014 Q4
47 quarters
TMF icon
613
Direxion Daily 20+ Year Treasury Bull 3X ETF
TMF
$1.9B
$13.7M 0.01%
531,598
+161,817
+44% +$5.02M
2025 Q2
5 quarters
TER icon
614
PUT
Teradyne
TER
$41.5B
$13.6M 0.01%
34,000
+3,100
+10% +$1.14M
2018 Q1
34 quarters
XLU icon
615
State Street Utilities Select Sector SPDR ETF
XLU
$24.2B
$13.5M 0.01%
343,512
+110,086
+47% +$4.78M
2026 Q2
1 quarter
GIS icon
616
CALL
General Mills
GIS
$18.3B
$13.5M 0.01%
421,000
+129,000
+44% +$4.81M
2014 Q4
47 quarters
AXTI icon
617
CALL
AXT Inc
AXTI
$3.08B
$13.5M 0.01%
174,800
-105,900
-38% -$6.84M
2024 Q1
10 quarters
CIEN icon
618
PUT
Ciena
CIEN
$42B
$13.5M 0.01%
38,400
-10,100
-21% -$3.9M
2014 Q4
47 quarters
MUB icon
619
iShares National Muni Bond ETF
MUB
$55B
$13.5M 0.01%
+133,229
New +$14M
2026 Q3
0 quarters
XEL icon
620
PUT
Xcel Energy
XEL
$52.1B
$13.5M 0.01%
191,100
+152,500
+395% +$11.7M
2019 Q1
30 quarters
OWL icon
621
CALL
Blue Owl Capital
OWL
$7.06B
$13.5M 0.01%
1,479,700
+168,900
+13% +$1.78M
2021 Q1
22 quarters
LCID icon
622
CALL
Lucid Motors
LCID
$1.45B
$13.4M 0.01%
3,293,100
-788,100
-19% -$4.46M
2021 Q4
19 quarters
CB icon
623
CALL
Chubb
CB
$141B
$13.4M 0.01%
41,100
+24,500
+148% +$8.46M
2021 Q2
21 quarters
LEU icon
624
CALL
Centrus Energy
LEU
$2.31B
$13.3M 0.01%
95,500
+61,800
+183% +$10.4M
2020 Q4
23 quarters
MDB icon
625
MongoDB
MDB
$27.2B
$13.3M 0.01%
+38,059
New +$14.4M
2026 Q3
0 quarters
23 24
25
26 27

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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.