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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+6.46%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
BLK icon
6201
Blackrock
BLK
$170B
$34K ﹤0.01%
50
– –
CLSD
6202
CALL
DELISTED
Clearside Biomedical
CLSD
$34K ﹤0.01%
2,060
-233
-10% -$4.01K
CRBU icon
6203
Caribou Biosciences
CRBU
$150M
$34K ﹤0.01%
8,061
+6,868
+576% +$30.9K
CSTL icon
6204
PUT
Castle Biosciences
CSTL
$813M
$34K ﹤0.01%
+2,500
New +$50.7K
EVER icon
6205
CALL
EverQuote
EVER
$886M
$34K ﹤0.01%
5,300
+4,500
+563% +$38K
FAF icon
6206
CALL
First American
FAF
$7.71B
$34K ﹤0.01%
600
+200
+50% +$11.3K
FDL icon
6207
CALL
First Trust Morningstar Dividend Leaders Index Fund
FDL
$7.74B
$34K ﹤0.01%
1,000
+300
+43% +$10.4K
DMC
6208
Del Monte Corp
DMC
$1.41B
$34K ﹤0.01%
+1,336
New +$36.9K
GB
6209
CALL
DELISTED
Global Blue Group Holding
GB
$34K ﹤0.01%
7,000
+6,000
+600% +$31.9K
GLDD
6210
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
$34K ﹤0.01%
+4,200
New +$27.3K
GPMT
6211
Granite Point Mortgage Trust
GPMT
$64.7M
$34K ﹤0.01%
6,495
-10,198
-61% -$48.4K
HPP
6212
PUT
Hudson Pacific Properties
HPP
$766M
$34K ﹤0.01%
1,171
+542
+86% +$19.4K
IGC icon
6213
CALL
IGC Pharma
IGC
$26M
$34K ﹤0.01%
109,700
-1,000
-0.9% -$324
IGE icon
6214
iShares North American Natural Resources ETF
IGE
$741M
$34K ﹤0.01%
887
+95
+12% +$3.67K
INN
6215
CALL
Summit Hotel Properties
INN
$748M
$34K ﹤0.01%
5,300
-10,700
-67% -$70.8K
KN icon
6216
CALL
Knowles
KN
$3.08B
$34K ﹤0.01%
1,900
-200
-10% -$3.36K
KULR icon
6217
CALL
KULR Technology Group
KULR
$120M
$34K ﹤0.01%
6,825
– –
LOMA
6218
Loma Negra
LOMA
$1.38B
$34K ﹤0.01%
+5,077
New +$33.1K
MCS icon
6219
PUT
Marcus Corp
MCS
$912M
$34K ﹤0.01%
2,300
– –
KG
6220
Kestrel Group
KG
$67.1M
$34K ﹤0.01%
810
-691
-46% -$29.5K
MHO icon
6221
PUT
M/I Homes
MHO
$3.87B
$34K ﹤0.01%
400
-600
-60% -$42.5K
MOV icon
6222
PUT
Movado Group
MOV
$849M
$34K ﹤0.01%
1,300
-3,000
-70% -$78.5K
MSA icon
6223
CALL
Mine Safety
MSA
$6.73B
$34K ﹤0.01%
200
+100
+100% +$14.3K
MSA icon
6224
PUT
Mine Safety
MSA
$6.73B
$34K ﹤0.01%
+200
New +$28.6K
NRIX icon
6225
CALL
Nurix Therapeutics
NRIX
$2.45B
$34K ﹤0.01%
3,500
+2,500
+250% +$25.5K
247 248
249
250 251

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.