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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
RITM icon
1651
CALL
Rithm Capital
RITM
$5.14B
$2.86M ﹤0.01%
320,000
+246,800
+337% +$2.39M
2017 Q1
38 quarters
UVIX icon
1652
PUT
2x Long VIX Futures ETF
UVIX
$131M
$2.86M ﹤0.01%
80,400
+73,975
+1,151% +$3.58M
2022 Q2
17 quarters
YUMC icon
1653
CALL
Yum China
YUMC
$16.5B
$2.86M ﹤0.01%
69,500
+15,700
+29% +$697K
2017 Q1
38 quarters
KIM icon
1654
CALL
Kimco Realty
KIM
$17B
$2.85M ﹤0.01%
128,300
-12,300
-9% -$299K
2018 Q2
33 quarters
KR icon
1655
Kroger
KR
$41B
$2.85M ﹤0.01%
48,605
-13,267
-21% -$772K
2026 Q2
1 quarter
TS icon
1656
CALL
Tenaris
TS
$30.9B
$2.84M ﹤0.01%
51,500
+15,500
+43% +$859K
2018 Q1
34 quarters
GSK icon
1657
PUT
GSK
GSK
$101B
$2.84M ﹤0.01%
58,900
-40,600
-41% -$2.07M
2014 Q4
47 quarters
GPN icon
1658
PUT
Global Payments
GPN
$26.5B
$2.83M ﹤0.01%
34,700
-139,600
-80% -$12M
2017 Q3
36 quarters
SSRM icon
1659
CALL
SSR Mining
SSRM
$5.6B
$2.83M ﹤0.01%
85,000
+45,900
+117% +$1.48M
2017 Q3
36 quarters
SONY icon
1660
PUT
Sony
SONY
$154B
$2.83M ﹤0.01%
125,700
+90,500
+257% +$2.07M
2014 Q4
47 quarters
BX icon
1661
Blackstone
BX
$96.5B
$2.83M ﹤0.01%
25,254
+121
+0.5% +$15.8K
2026 Q1
2 quarters
CFG icon
1662
PUT
Citizens Financial Group
CFG
$27.4B
$2.82M ﹤0.01%
44,200
+300
+0.7% +$21.1K
2016 Q1
42 quarters
BIDU icon
1663
Baidu
BIDU
$27.2B
$2.82M ﹤0.01%
32,434
-31,364
-49% -$3.17M
2026 Q2
1 quarter
CDNA icon
1664
PUT
CareDx
CDNA
$4.26B
$2.81M ﹤0.01%
43,300
+42,200
+3,836% +$1.91M
2026 Q2
1 quarter
HRTS icon
1665
CALL
Tema ETF Trust Tema Heart & Health ETF
HRTS
$58.3M
$2.81M ﹤0.01%
116,900
-89,200
-43% -$3.3M
2026 Q2
1 quarter
QSR icon
1666
PUT
Restaurant Brands International
QSR
$26.7B
$2.81M ﹤0.01%
39,500
-9,400
-19% -$708K
2015 Q1
46 quarters
AGI icon
1667
Alamos Gold
AGI
$12.6B
$2.81M ﹤0.01%
86,644
+72,679
+520% +$2.4M
2026 Q2
1 quarter
EAT icon
1668
PUT
Brinker International
EAT
$8.34B
$2.81M ﹤0.01%
14,500
+9,000
+164% +$1.9M
2016 Q3
40 quarters
RCAT icon
1669
CALL
Red Cat Holdings
RCAT
$655M
$2.8M ﹤0.01%
434,200
+122,000
+39% +$1.03M
2024 Q3
8 quarters
LBTYK icon
1670
CALL
Liberty Global Class C
LBTYK
$3.47B
$2.8M ﹤0.01%
306,900
+230,900
+304% +$2.34M
2018 Q2
33 quarters
CNQ icon
1671
Canadian Natural Resources
CNQ
$99.5B
$2.79M ﹤0.01%
59,324
+1,908
+3% +$89.9K
2025 Q3
4 quarters
WPP icon
1672
CALL
WPP
WPP
$6.02B
$2.79M ﹤0.01%
112,800
+108,100
+2,300% +$2.5M
2025 Q3
4 quarters
FLEX icon
1673
PUT
Flex
FLEX
$29.2B
$2.78M ﹤0.01%
25,300
-48,500
-66% -$5.74M
2017 Q1
38 quarters
ARWR icon
1674
CALL
Arrowhead Research
ARWR
$6.97B
$2.78M ﹤0.01%
42,500
+11,300
+36% +$915K
2026 Q1
2 quarters
SAN icon
1675
CALL
Banco Santander
SAN
$180B
$2.78M ﹤0.01%
201,100
-120,700
-38% -$1.72M
2021 Q1
22 quarters
65 66
67
68 69

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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.