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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$7.93B
Cap. Flow %
-5.08%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Consumer Discretionary 0.22%
3 Healthcare 0.17%
4 Communication Services 0.15%
5 Financials 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CMC icon
8626
Commercial Metals
CMC
$7.63B
– –
-441
Closed -$21.5K
CMCL icon
8627
Caledonia Mining Corp
CMCL
$360M
– –
-905
Closed -$9.29K
CMCO icon
8628
CALL
Columbus McKinnon
CMCO
$465M
– –
-5,600
Closed -$208K
CMCT
8629
Creative Media & Community Trust
CMCT
$8.25M
– –
0
– –
CME icon
8630
CME Group
CME
$92.2B
– –
-11,162
Closed -$2.75M
CMTG icon
8631
PUT
Claros Mortgage Trust
CMTG
$306M
– –
-9,900
Closed -$44K
CNBS icon
8632
Amplify Seymour Cannabis ETF
CNBS
$70.8M
– –
-751
Closed -$18K
CNMD icon
8633
CALL
CONMED
CNMD
$1.29B
– –
-2,100
Closed -$143K
CNMD icon
8634
PUT
CONMED
CNMD
$1.29B
– –
-9,500
Closed -$650K
CNO icon
8635
CNO Financial Group
CNO
$4.97B
$0 ﹤0.01%
+1
New +$40
CNX icon
8636
CNX Resources
CNX
$4.85B
– –
-27,005
Closed -$813K
CNXC icon
8637
Concentrix
CNXC
$1.36B
– –
-3,513
Closed -$168K
CODX
8638
Co-Diagnostics
CODX
$7.74M
$0 ﹤0.01%
62
-855
-93% -$16.3K
CODX
8639
PUT
Co-Diagnostics
CODX
$7.74M
– –
-1,400
Closed -$31K
COF icon
8640
Capital One
COF
$124B
– –
-37,719
Closed -$7.13M
COGT icon
8641
Cogent Biosciences
COGT
$6.79B
$0 ﹤0.01%
12
-46,598
-100% -$365K
COGT icon
8642
PUT
Cogent Biosciences
COGT
$6.79B
– –
-47,100
Closed -$367K
CONY icon
8643
YieldMax COIN Option Income Strategy ETF
CONY
$321M
– –
-6,600
Closed -$860K
COO icon
8644
Cooper Companies
COO
$13.7B
– –
-1,846
Closed -$165K
COOP
8645
DELISTED
Mr. Cooper
COOP
– –
-743
Closed -$77.6K
COOK icon
8646
PUT
Traeger
COOK
$170M
– –
-394
Closed -$47K
COSM icon
8647
Cosmos Holdings
COSM
$12.4M
$0 ﹤0.01%
205
-1,213
-86% -$750
COST icon
8648
Costco
COST
$415B
– –
-8,469
Closed -$8.26M
CPF icon
8649
CALL
Central Pacific Financial
CPF
$1.01B
– –
-100
Closed -$2K
CPK icon
8650
Chesapeake Utilities
CPK
$3.26B
– –
-144
Closed -$17K
344 345
346
347 348

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.