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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
ALGN icon
8851
Align Technology
ALGN
$12B
– –
-19,632
Closed -$6.25M
ALHC icon
8852
Alignment Healthcare
ALHC
$4.02B
– –
-29
Closed -$188
ALK icon
8853
Alaska Air
ALK
$5.15B
– –
-13,008
Closed -$591K
ALLK
8854
DELISTED
Allakos
ALLK
– –
-4,203
Closed -$18.9K
ALLK
8855
PUT
DELISTED
Allakos
ALLK
– –
-5,100
Closed -$22K
ALLO icon
8856
PUT
Allogene Therapeutics
ALLO
$601M
– –
-134,900
Closed -$666K
ALLT icon
8857
CALL
Allot
ALLT
$374M
– –
-1,500
Closed -$4K
ALNY icon
8858
Alnylam Pharmaceuticals
ALNY
$36.3B
– –
-13,723
Closed -$2.72M
ALSN icon
8859
CALL
Allison Transmission
ALSN
$10.1B
– –
-38,800
Closed -$1.75M
ALTG icon
8860
CALL
Alta Equipment Group
ALTG
$210M
– –
-3,000
Closed -$47K
ALZN icon
8861
CALL
Alzamend Neuro
ALZN
$5.06M
– –
-5
Closed -$2K
ALZN icon
8862
Alzamend Neuro
ALZN
$5.06M
– –
0
– –
AMAL icon
8863
Amalgamated Financial
AMAL
$1.48B
– –
-134
Closed -$2K
AMBA icon
8864
Ambarella
AMBA
$2.99B
– –
-20,980
Closed -$1.53M
AMCX icon
8865
AMC Global Media
AMCX
$430M
– –
-4,159
Closed -$60K
AMKR icon
8866
Amkor Technology
AMKR
$16.1B
– –
-12,960
Closed -$315K
AMPH icon
8867
PUT
Amphastar Pharmaceuticals
AMPH
$825M
– –
-500
Closed -$18K
AMRN
8868
Amarin Corp
AMRN
$284M
– –
-2,022
Closed -$51.9K
AMRX icon
8869
CALL
Amneal Pharmaceuticals
AMRX
$5.72B
– –
-6,600
Closed -$9K
AMR icon
8870
Alpha Metallurgical Resources
AMR
$1.82B
– –
-16,765
Closed -$2.56M
AMTX icon
8871
Aemetis
AMTX
$119M
– –
-11,769
Closed -$44.7K
AMWD
8872
DELISTED
American Woodmark
AMWD
– –
-1,110
Closed -$64.5K
ANGI icon
8873
Angi Inc
ANGI
$224M
– –
-364
Closed -$10.2K
ANGO icon
8874
CALL
AngioDynamics
ANGO
$562M
– –
-6,400
Closed -$66K
ANGO icon
8875
PUT
AngioDynamics
ANGO
$562M
– –
-2,400
Closed -$24K
353 354
355
356 357

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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.