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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
ASTE icon
8901
Astec Industries
ASTE
$1.3B
$0 ﹤0.01%
13
-1,233
-99% -$50.8K
ASTE icon
8902
PUT
Astec Industries
ASTE
$1.3B
– –
-3,600
Closed -$148K
ASTI icon
8903
Ascent Solar Technologies
ASTI
$29M
– –
0
– –
ASTS icon
8904
AST SpaceMobile
ASTS
$16.8B
– –
-9,484
Closed -$49.2K
ASUR icon
8905
PUT
Asure Software
ASUR
$220M
– –
-10,300
Closed -$149K
ASX icon
8906
CALL
ASE Group
ASX
$80.8B
– –
-20,900
Closed -$166K
ASYS icon
8907
PUT
Amtech Systems
ASYS
$278M
– –
-1,000
Closed -$9K
ATEN icon
8908
A10 Networks
ATEN
$2.47B
– –
-265
Closed -$3.83K
CVSA
8909
CALL
Covista Inc
CVSA
$3.94B
– –
-200
Closed -$7K
ATNI icon
8910
CALL
ATN International
ATNI
$361M
– –
-13,200
Closed -$540K
ATR icon
8911
AptarGroup
ATR
$8.45B
$0 ﹤0.01%
5
-14
-74% -$1.64K
ATR icon
8912
PUT
AptarGroup
ATR
$8.45B
– –
-300
Closed -$35K
ATRO icon
8913
PUT
Astronics
ATRO
$3.45B
– –
-23,160
Closed -$257K
ATXS
8914
CALL
DELISTED
Astria Therapeutics
ATXS
– –
-1,300
Closed -$17K
AUB icon
8915
Atlantic Union Bankshares
AUB
$5.99B
– –
-758
Closed -$26K
AUB icon
8916
PUT
Atlantic Union Bankshares
AUB
$5.99B
– –
-800
Closed -$28K
AUDC icon
8917
CALL
AudioCodes
AUDC
$244M
– –
-6,200
Closed -$93K
AUDC icon
8918
PUT
AudioCodes
AUDC
$244M
– –
-7,900
Closed -$119K
AVAH icon
8919
Aveanna Healthcare
AVAH
$2.06B
– –
-2,042
Closed -$2.56K
AVAH icon
8920
PUT
Aveanna Healthcare
AVAH
$2.06B
– –
-3,000
Closed -$3K
AVDX
8921
DELISTED
AvidXchange
AVDX
– –
-4,655
Closed -$41.9K
AVIR icon
8922
PUT
Atea Pharmaceuticals
AVIR
$379M
– –
-2,600
Closed -$8K
AWRE icon
8923
Aware
AWRE
$23.6M
$0 ﹤0.01%
34
-767
-96% -$1.26K
AXDX
8924
CALL
DELISTED
Accelerate Diagnostics
AXDX
– –
-630
Closed -$4K
AXS icon
8925
AXIS Capital
AXS
$8.59B
– –
-129
Closed -$7.05K
355 356
357
358 359

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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.