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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
OLO
8451
CALL
DELISTED
Olo Inc
OLO
$2K ﹤0.01%
400
-11,900
-97% -$85.6K
OPRT icon
8452
CALL
Oportun Financial
OPRT
$257M
$2K ﹤0.01%
400
-1,300
-76% -$6.38K
OVID icon
8453
CALL
Ovid Therapeutics
OVID
$435M
$2K ﹤0.01%
+700
New +$2.38K
PANL icon
8454
PUT
Pangaea Logistics
PANL
$501M
$2K ﹤0.01%
400
-1,100
-73% -$6.79K
PINC
8455
CALL
DELISTED
Premier
PINC
$2K ﹤0.01%
+100
New +$2.85K
PLUR icon
8456
CALL
Pluri
PLUR
$19.2M
$2K ﹤0.01%
325
-138
-30% -$977
QRHC icon
8457
Quest Resource Holding
QRHC
$25.9M
$2K ﹤0.01%
348
-3,713
-91% -$21.2K
RMAX icon
8458
RE/MAX Holdings
RMAX
$200M
$2K ﹤0.01%
+122
New +$2.28K
RMR icon
8459
CALL
The RMR Group
RMR
$342M
$2K ﹤0.01%
+100
New +$2.33K
RYZ
8460
Ryerson Holding Corp
RYZ
$1.6B
$2K ﹤0.01%
51
-646
-93% -$24K
SEER icon
8461
PUT
Seer Inc
SEER
$108M
$2K ﹤0.01%
500
-500
-50% -$1.96K
SGC icon
8462
CALL
Superior Group of Companies
SGC
$193M
$2K ﹤0.01%
+300
New +$2.52K
SGLY icon
8463
PUT
Singularity Future Technology
SGLY
$241K
$2K ﹤0.01%
+560
New +$3.17K
SHIP icon
8464
PUT
Seanergy Maritime Holdings
SHIP
$351M
$2K ﹤0.01%
+500
New +$2.32K
SKIL icon
8465
CALL
Skillsoft
SKIL
$56.9M
$2K ﹤0.01%
+120
New +$3.51K
SPDN icon
8466
Direxion Daily S&P 500 Bear 1X ETF
SPDN
$232M
$2K ﹤0.01%
143
+111
+347% +$1.69K
SPEU icon
8467
State Street SPDR Portfolio Europe ETF
SPEU
$712M
$2K ﹤0.01%
+54
New +$2.1K
SPMD icon
8468
State Street SPDR Portfolio S&P 400 Mid Cap ETF
SPMD
$18.2B
$2K ﹤0.01%
63
-553
-90% -$24.2K
SRRK icon
8469
CALL
Scholar Rock
SRRK
$5.71B
$2K ﹤0.01%
+300
New +$2.27K
TBF icon
8470
ProShares Short 20+ Year Treasury ETF
TBF
$84.9M
$2K ﹤0.01%
+100
New +$2.17K
TEF
8471
DELISTED
Telefonica
TEF
$2K ﹤0.01%
565
-6,739
-92% -$28.6K
TGI
8472
PUT
DELISTED
Triumph Group
TGI
$2K ﹤0.01%
+200
New +$2.28K
THD icon
8473
iShares MSCI Thailand ETF
THD
$361M
$2K ﹤0.01%
+37
New +$2.59K
TIMB icon
8474
TIM SA
TIMB
$10.2B
$2K ﹤0.01%
+161
New +$2.28K
TIXT
8475
DELISTED
TELUS International
TIXT
$2K ﹤0.01%
156
-7,368
-98% -$128K
337 338
339
340 341

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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.