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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
PSO icon
9726
Pearson
PSO
$9.73B
– –
-355
Closed -$3.66K
PSO icon
9727
PUT
Pearson
PSO
$9.73B
– –
-900
Closed -$9K
PTC icon
9728
PTC
PTC
$13.2B
– –
-17,607
Closed -$2.33M
BCIC
9729
BCP Investment Corp
BCIC
$87.3M
– –
-114
Closed -$2.27K
BCIC
9730
PUT
BCP Investment Corp
BCIC
$87.3M
– –
-100
Closed -$2K
PUK icon
9731
CALL
Prudential
PUK
$36.2B
– –
-1,000
Closed -$27K
PUMP icon
9732
ProPetro Holding
PUMP
$1.66B
– –
-5,794
Closed -$42.5K
PUMP icon
9733
PUT
ProPetro Holding
PUMP
$1.66B
– –
-15,700
Closed -$112K
RPC
9734
CALL
Ridgepost Capital
RPC
$910M
– –
-700
Closed -$7K
HTT
9735
High Templar Tech Ltd
HTT
$382M
– –
-5,000
Closed -$7.22K
QGEN icon
9736
Qiagen
QGEN
$8.51B
– –
-613
Closed -$29.5K
QQQE icon
9737
Direxion NASDAQ-100 Equal Weighted Index ETF
QQQE
$1.35B
– –
-144
Closed -$10K
QTEC icon
9738
CALL
First Trust NASDAQ-100 Technology Index Fund
QTEC
$4.55B
– –
-100
Closed -$13K
QUAL icon
9739
iShares MSCI USA Quality Factor ETF
QUAL
$45.6B
– –
-88
Closed -$10K
QUBT icon
9740
Quantum Computing Inc
QUBT
$1.82B
– –
-14,722
Closed -$19.4K
QUIK icon
9741
CALL
QuickLogic
QUIK
$246M
– –
-4,800
Closed -$28K
RACE icon
9742
Ferrari
RACE
$63.6B
– –
-7,519
Closed -$2.19M
RAPT
9743
DELISTED
RAPT Therapeutics
RAPT
$0 ﹤0.01%
5
-235
-98% -$36.6K
RBA icon
9744
RB Global
RBA
$20.4B
– –
-44,542
Closed -$2.51M
RBOT
9745
CALL
DELISTED
Vicarious Surgical
RBOT
– –
-163
Closed -$11K
RCKT icon
9746
Rocket Pharmaceuticals
RCKT
$348M
– –
-3,385
Closed -$68.4K
RCI icon
9747
PUT
Rogers Communications
RCI
$18B
– –
-17,000
Closed -$788K
RDHL
9748
CALL
Redhill Biopharma
RDHL
$4.17M
– –
-648
Closed -$66K
RDHL
9749
PUT
Redhill Biopharma
RDHL
$4.17M
– –
-108
Closed -$11K
RDI icon
9750
Reading International Class A
RDI
$32.7M
– –
-476
Closed -$1K
388 389
390
391 392

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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.