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Simplex Trading

Simplex Trading Portfolio holdings

AUM $184B Turnover 28.45%
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
+39.06%
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
$171B
AUM Growth
+$21.5B
Cap. Flow
-$29.5M
Cap. Flow %
-0.02%
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487
Avg Time Held Equity + Options
2.9 years
Top 10 Avg Time Held Equity + Options
3.8 years
Top 20 Avg Time Held Equity + Options
4.1 years
Avg Time Held Equity only
0.5 years
Top 10 Avg Time Held Equity only
0.3 years
Top 20 Avg Time Held Equity only
0.3 years

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$146M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$108M
3
AAPL icon
Apple
AAPL
+$62.9M
4
TSLA icon
Tesla
TSLA
+$51.9M
5
MU icon
Micron Technology
MU
+$39.5M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$108M
2
META icon
Meta Platforms (Facebook)
META
+$104M
3
AMD icon
Advanced Micro Devices
AMD
+$92.1M
4
AMZN icon
Amazon
AMZN
+$90.3M
5
TSM icon
TSMC
TSM
+$82.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.28%
2 Technology 0.76%
3 Consumer Discretionary 0.21%
4 Communication Services 0.19%
5 Healthcare 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow Held Since
SPY icon
1
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$811B
$24.9B 14.63%
33,407,300
-8,740,600
-21% -$6.34B
2015 Q1
45 quarters
SPY icon
2
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$811B
$17B 9.95%
22,725,000
+1,074,900
+5% +$779M
2015 Q1
45 quarters
QQQ icon
3
PUT
Invesco QQQ Trust
QQQ
$467B
$10.1B 5.94%
13,765,500
+2,513,100
+22% +$1.73B
2021 Q2
20 quarters
QQQ icon
4
CALL
Invesco QQQ Trust
QQQ
$467B
$8.03B 4.71%
10,904,800
+526,600
+5% +$362M
2021 Q2
20 quarters
OEF icon
5
PUT
iShares S&P 100 ETF
OEF
$20.4B
$7.76B 4.55%
39,367,200
+5,148,700
+15% +$1.84B
2014 Q4
46 quarters
MU icon
6
PUT
Micron Technology
MU
$900B
$3.63B 2.13%
3,140,900
+1,023,900
+48% +$768M
2021 Q1
21 quarters
NVDA icon
7
CALL
NVIDIA
NVDA
$4.83T
$3.51B 2.06%
17,519,600
-1,561,100
-8% -$321M
2021 Q2
20 quarters
OEF icon
8
CALL
iShares S&P 100 ETF
OEF
$20.4B
$3.34B 1.96%
26,912,500
-6,536,500
-20% -$2.34B
2014 Q4
46 quarters
NVDA icon
9
PUT
NVIDIA
NVDA
$4.83T
$3.28B 1.92%
16,385,300
-2,824,200
-15% -$581M
2021 Q2
20 quarters
TSLA icon
10
CALL
Tesla
TSLA
$1.52T
$2.94B 1.73%
7,001,500
-2,194,900
-24% -$873M
2021 Q2
20 quarters
TSLA icon
11
PUT
Tesla
TSLA
$1.52T
$2.44B 1.43%
5,799,800
-2,512,600
-30% -$999M
2021 Q2
20 quarters
GOOGL icon
12
CALL
Alphabet (Google) Class A
GOOGL
$3.55T
$2.37B 1.39%
6,656,100
-541,100
-8% -$195M
2015 Q4
42 quarters
AAPL icon
13
CALL
Apple
AAPL
$5.1T
$2.36B 1.39%
8,168,800
-591,300
-7% -$169M
2015 Q1
45 quarters
MU icon
14
CALL
Micron Technology
MU
$900B
$2.2B 1.29%
1,906,800
-121,000
-6% -$90.7M
2021 Q1
21 quarters
META icon
15
CALL
Meta Platforms (Facebook)
META
$1.64T
$2.04B 1.2%
3,620,200
-489,500
-12% -$299M
2014 Q4
46 quarters
SNDK icon
16
PUT
Sandisk
SNDK
$148B
$1.97B 1.15%
864,500
+578,300
+202% +$826M
2025 Q1
5 quarters
AMD icon
17
PUT
Advanced Micro Devices
AMD
$798B
$1.96B 1.15%
3,374,900
-106,000
-3% -$43.5M
2015 Q1
45 quarters
GOOGL icon
18
PUT
Alphabet (Google) Class A
GOOGL
$3.55T
$1.93B 1.13%
5,428,100
+375,000
+7% +$135M
2015 Q4
42 quarters
MSFT icon
19
CALL
Microsoft
MSFT
$4.13T
$1.74B 1.02%
4,655,800
+477,400
+11% +$193M
2014 Q4
46 quarters
AAPL icon
20
PUT
Apple
AAPL
$5.1T
$1.72B 1.01%
5,954,700
-68,200
-1% -$19.5M
2015 Q1
45 quarters
AMD icon
21
CALL
Advanced Micro Devices
AMD
$798B
$1.71B 1.01%
2,951,000
+3,400
+0.1% +$1.39M
2015 Q3
43 quarters
GDX icon
22
PUT
VanEck Gold Miners ETF
GDX
$26.1B
$1.62B 0.95%
3,966,700
+690,600
+21% +$61M
2014 Q4
46 quarters
GLD icon
23
CALL
SPDR Gold Trust
GLD
$136B
$1.45B 0.85%
3,937,600
-1,552,900
-28% -$643M
2015 Q1
45 quarters
AMZN icon
24
CALL
Amazon
AMZN
$2.88T
$1.24B 0.73%
5,219,400
-1,781,100
-25% -$447M
2015 Q1
45 quarters
META icon
25
PUT
Meta Platforms (Facebook)
META
$1.64T
$1.17B 0.69%
2,084,500
-417,000
-17% -$255M
2014 Q4
46 quarters
1
2 3 4 5

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Simplex Trading's Q2 2026 Portfolio in Review

As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.

Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
  • Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
  • Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
  • Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
  • Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
  • Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.