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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
XLB icon
26
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.53B
$1.16B 0.63%
16,397,500
+3,405,700
+26% +$175M
2015 Q1
46 quarters
AMZN icon
27
CALL
Amazon
AMZN
$2.89T
$1.06B 0.58%
4,268,800
-950,600
-18% -$242M
2015 Q1
46 quarters
XLB icon
28
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.53B
$1.02B 0.56%
15,340,100
+2,892,100
+23% +$149M
2015 Q1
46 quarters
AMZN icon
29
PUT
Amazon
AMZN
$2.89T
$962M 0.52%
3,859,500
+373,300
+11% +$94.8M
2015 Q1
46 quarters
GDX icon
30
CALL
VanEck Gold Miners ETF
GDX
$28.2B
$924M 0.5%
3,566,000
+297,900
+9% +$26M
2014 Q4
47 quarters
GLD icon
31
PUT
SPDR Gold Trust
GLD
$138B
$921M 0.5%
2,418,700
+410,100
+20% +$160M
2015 Q1
46 quarters
DIA icon
32
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
$891M 0.48%
1,752,400
+249,400
+17% +$131M
2015 Q1
46 quarters
PLTR icon
33
PUT
Palantir
PLTR
$408B
$874M 0.48%
4,675,200
-16,800
-0.4% -$2.68M
2021 Q2
21 quarters
SNDK icon
34
CALL
Sandisk
SNDK
$126B
$777M 0.42%
446,800
+188,100
+73% +$294M
2025 Q1
6 quarters
IBIT icon
35
CALL
iShares Bitcoin Trust
IBIT
$60B
$748M 0.41%
15,794,600
+3,333,500
+27% +$134M
2024 Q4
7 quarters
INTC icon
36
CALL
Intel
INTC
$316B
$719M 0.39%
5,976,300
+791,000
+15% +$80.7M
2014 Q4
47 quarters
AVGO icon
37
CALL
Broadcom
AVGO
$1.53T
$695M 0.38%
1,978,000
+136,900
+7% +$51.5M
2021 Q2
21 quarters
INTC icon
38
PUT
Intel
INTC
$316B
$686M 0.37%
5,705,800
+370,900
+7% +$37.8M
2014 Q4
47 quarters
SPCX icon
39
PUT
SpaceX
SPCX
$1.93T
$663M 0.36%
4,392,300
+2,502,200
+132% +$346M
2026 Q2
1 quarter
SPCX icon
40
CALL
SpaceX
SPCX
$1.93T
$646M 0.35%
4,279,200
+1,930,600
+82% +$267M
2026 Q2
1 quarter
IBIT icon
41
PUT
iShares Bitcoin Trust
IBIT
$60B
$632M 0.34%
13,353,400
+1,858,800
+16% +$75M
2024 Q4
7 quarters
SLV icon
42
CALL
iShares Silver Trust
SLV
$25.9B
$613M 0.33%
11,249,000
+332,900
+3% +$18.9M
2021 Q2
21 quarters
AVGO icon
43
PUT
Broadcom
AVGO
$1.53T
$600M 0.33%
1,709,200
-288,100
-14% -$108M
2021 Q2
21 quarters
ORCL icon
44
CALL
Oracle
ORCL
$373B
$583M 0.32%
4,245,200
+1,829,000
+76% +$258M
2014 Q4
47 quarters
TSM icon
45
PUT
TSMC
TSM
$2.02T
$576M 0.31%
1,261,800
-58,200
-4% -$24.7M
2026 Q1
2 quarters
PLTR icon
46
CALL
Palantir
PLTR
$408B
$497M 0.27%
2,659,200
-969,700
-27% -$155M
2021 Q2
21 quarters
ORCL icon
47
PUT
Oracle
ORCL
$373B
$465M 0.25%
3,386,100
+767,000
+29% +$108M
2014 Q4
47 quarters
TSM icon
48
CALL
TSMC
TSM
$2.02T
$462M 0.25%
1,012,000
+424,700
+72% +$180M
2026 Q1
2 quarters
MSTR icon
49
PUT
Strategy Inc
MSTR
$53.2B
$437M 0.24%
2,862,700
-381,000
-12% -$44.1M
2020 Q4
23 quarters
EWA icon
50
CALL
iShares MSCI Australia ETF
EWA
$1.26B
$431M 0.23%
8,670,200
+3,356,900
+63% +$98.1M
2014 Q4
47 quarters
1
2
3 4 5

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Swiss National Bank
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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.