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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
HPQ icon
2701
HP
HPQ
$26.1B
$1.02M ﹤0.01%
32,601
-72,766
-69% -$2.1M
2026 Q1
2 quarters
QNT icon
2702
PUT
Quantinuum Inc
QNT
$1.85B
$1.02M ﹤0.01%
21,200
+19,500
+1,147% +$1.1M
2026 Q2
1 quarter
AXGN icon
2703
Axogen
AXGN
$3.5B
$1.02M ﹤0.01%
24,295
+21,348
+724% +$959K
2026 Q1
2 quarters
AMPX icon
2704
PUT
Amprius Technologies
AMPX
$1.25B
$1.02M ﹤0.01%
105,100
-120,000
-53% -$1.25M
2022 Q4
15 quarters
XERS icon
2705
CALL
Xeris Biopharma Holdings
XERS
$3.02B
$1.01M ﹤0.01%
106,000
-53,100
-33% -$449K
2026 Q1
2 quarters
ETH icon
2706
Grayscale Ethereum Staking Mini ETF Shares
ETH
$1.75B
$1.01M ﹤0.01%
39,738
-37,217
-48% -$769K
2026 Q1
2 quarters
REAX icon
2707
PUT
Real REMAX Group Inc. Common Stock
REAX
$428M
$1.01M ﹤0.01%
61,900
+55,750
+907% +$1.12M
2024 Q1
10 quarters
AUPH icon
2708
CALL
Aurinia Pharmaceuticals
AUPH
$2.17B
$1.01M ﹤0.01%
62,500
-68,900
-52% -$1.1M
2021 Q2
21 quarters
AZTA icon
2709
PUT
Azenta
AZTA
$2.04B
$1.01M ﹤0.01%
29,000
-400
-1% -$12.3K
2023 Q3
12 quarters
ALC icon
2710
Alcon
ALC
$34.8B
$1.01M ﹤0.01%
15,612
+8,346
+115% +$579K
2025 Q4
3 quarters
MBUU icon
2711
PUT
Malibu Boats
MBUU
$403M
$1.01M ﹤0.01%
44,100
+35,700
+425% +$960K
2019 Q2
29 quarters
PHM icon
2712
PUT
Pultegroup
PHM
$23.8B
$1.01M ﹤0.01%
8,700
-2,500
-22% -$314K
2017 Q4
35 quarters
CAMT icon
2713
PUT
Camtek
CAMT
$5B
$1.01M ﹤0.01%
6,500
+3,700
+132% +$544K
2021 Q1
22 quarters
BKD icon
2714
Brookdale Senior Living
BKD
$2.21B
$1.01M ﹤0.01%
93,053
+79,442
+584% +$1.04M
2025 Q1
6 quarters
FMC icon
2715
PUT
FMC
FMC
$879M
$1.01M ﹤0.01%
112,900
-37,800
-25% -$413K
2016 Q1
42 quarters
ABSI icon
2716
Absci
ABSI
$1.74B
$1M ﹤0.01%
93,256
+27,549
+42% +$252K
2026 Q1
2 quarters
NN icon
2717
PUT
NextNav
NN
$1.44B
$1M ﹤0.01%
69,800
+14,700
+27% +$226K
2023 Q4
11 quarters
PLNT icon
2718
Planet Fitness
PLNT
$4.54B
$1M ﹤0.01%
23,743
+2,034
+9% +$104K
2026 Q1
2 quarters
PS icon
2719
CALL
Pershing Square
PS
$17.8B
$1M ﹤0.01%
17,900
+14,200
+384% +$561K
2026 Q2
1 quarter
WCN icon
2720
CALL
Waste Connections
WCN
$48.1B
$1M ﹤0.01%
6,500
+5,200
+400% +$859K
2025 Q4
3 quarters
XRAY icon
2721
CALL
Dentsply Sirona
XRAY
$1.95B
$999K ﹤0.01%
112,800
+101,000
+856% +$1.17M
2018 Q2
33 quarters
CGC icon
2722
CALL
Canopy Growth
CGC
$256M
$999K ﹤0.01%
1,114,200
-289,300
-21% -$278K
2018 Q2
33 quarters
RSKD icon
2723
Riskified
RSKD
$1.37B
$998K ﹤0.01%
+126,192
New +$746K
2026 Q3
0 quarters
FVRR icon
2724
CALL
Fiverr
FVRR
$285M
$997K ﹤0.01%
115,700
+65,000
+128% +$627K
2020 Q1
26 quarters
OPCH icon
2725
Option Care Health
OPCH
$4.75B
$996K ﹤0.01%
44,285
+24,400
+123% +$563K
2026 Q2
1 quarter
107 108
109
110 111

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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.