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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
ANGO icon
8551
AngioDynamics
ANGO
$562M
$1K ﹤0.01%
126
+120
+2,000% +$1.16K
ARCO icon
8552
CALL
Arcos Dorados Holdings
ARCO
$1.73B
$1K ﹤0.01%
+100
New +$855
ASA
8553
ASA Gold and Precious Metals
ASA
$948M
$1K ﹤0.01%
+68
New +$1.1K
ASPS icon
8554
PUT
Altisource Portfolio Solutions
ASPS
$65.4M
$1K ﹤0.01%
850
+37
+5% +$1.37K
ASTI icon
8555
PUT
Ascent Solar Technologies
ASTI
$29M
$1K ﹤0.01%
+1
New +$4.16K
ATRA icon
8556
CALL
Atara Biotherapeutics
ATRA
$71.2M
$1K ﹤0.01%
40
-288
-88% -$16.3K
AXDX
8557
DELISTED
Accelerate Diagnostics
AXDX
$1K ﹤0.01%
124
-487
-80% -$3.66K
BCTXW
8558
PUT
DELISTED
BriaCell Therapeutics Corp Warrant
BCTXW
$1K ﹤0.01%
300
+100
+50% +$275
BDTX icon
8559
Black Diamond Therapeutics
BDTX
$101M
$1K ﹤0.01%
+350
New +$715
BHR
8560
CALL
Braemar Hotels & Resorts
BHR
$153M
$1K ﹤0.01%
400
– –
BIOX icon
8561
CALL
Bioceres Crop Solutions
BIOX
$21.9M
$1K ﹤0.01%
100
-200
-67% -$2.35K
BNDD icon
8562
Quadratic Deflation ETF
BNDD
$65.4M
$1K ﹤0.01%
+8
New +$1K
BOC icon
8563
PUT
Boston Omaha
BOC
$429M
$1K ﹤0.01%
100
-500
-83% -$10.2K
BRF icon
8564
VanEck Brazil Small-Cap ETF
BRF
$21.6M
$1K ﹤0.01%
63
-9,435
-99% -$147K
BURU
8565
PUT
DELISTED
NUBURU INC
BURU
$1K ﹤0.01%
8
-67
-89% -$16.3K
CAF
8566
CALL
Morgan Stanley China A Share Fund
CAF
$334M
$1K ﹤0.01%
100
– –
CALF icon
8567
Pacer US Small Cap Cash Cows 100 ETF
CALF
$3.59B
$1K ﹤0.01%
+47
New +$1.78K
CBAT icon
8568
PUT
CBAK Energy Technology Ltd
CBAT
$46.3M
$1K ﹤0.01%
+1,000
New +$973
CELC icon
8569
Celcuity
CELC
$4.03B
$1K ﹤0.01%
+118
New +$1.23K
CENN icon
8570
Cenntro
CENN
$8.23M
$1K ﹤0.01%
9
-15
-63% -$3.17K
CEPU
8571
CALL
Central Puerto
CEPU
$2.22B
$1K ﹤0.01%
200
-2,200
-92% -$14.1K
CFFN icon
8572
PUT
Capitol Federal Financial
CFFN
$1.08B
$1K ﹤0.01%
+200
New +$1.24K
CLPR
8573
Clipper Realty
CLPR
$46.5M
$1K ﹤0.01%
283
+78
+38% +$425
CMBM
8574
CALL
DELISTED
Cambium Networks
CMBM
$1K ﹤0.01%
100
-400
-80% -$6.2K
COGT icon
8575
PUT
Cogent Biosciences
COGT
$6.79B
$1K ﹤0.01%
100
-1,200
-92% -$13.8K
341 342
343
344 345

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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.