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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
SLAI
8576
DELISTED
SOLAI Ltd ADS
SLAI
– –
-149
Closed -$2.38K
SLAI
8577
PUT
DELISTED
SOLAI Ltd ADS
SLAI
– –
-286
Closed -$5K
BV icon
8578
CALL
BrightView Holdings
BV
$1.31B
– –
-1,500
Closed -$23K
BVS icon
8579
Bioventus
BVS
$799M
– –
-21,180
Closed -$212K
BWEN icon
8580
PUT
Broadwind
BWEN
$113M
– –
-1,200
Closed -$2K
BXC icon
8581
PUT
BlueLinx
BXC
$455M
– –
-100
Closed -$10K
BYSI icon
8582
CALL
BeyondSpring
BYSI
$46.1M
– –
-900
Closed -$1K
BYSI icon
8583
BeyondSpring
BYSI
$46.1M
– –
-9
Closed –
BZ icon
8584
Kanzhun
BZ
$6.89B
– –
-51,946
Closed -$845K
BZH icon
8585
Beazer Homes USA
BZH
$907M
– –
-21,715
Closed -$521K
CAH icon
8586
Cardinal Health
CAH
$53.4B
– –
-6,311
Closed -$804K
CAR icon
8587
Avis
CAR
$5.63B
– –
-14,034
Closed -$1.13M
CARE icon
8588
Carter Bankshares
CARE
$756M
– –
-5,062
Closed -$89K
CARS icon
8589
PUT
Cars.com
CARS
$641M
– –
-33,500
Closed -$580K
CASI
8590
DELISTED
CASI Pharmaceuticals
CASI
$0 ﹤0.01%
+114
New +$279
CATO icon
8591
CALL
Cato Corp
CATO
$65.9M
– –
-3,300
Closed -$12K
CATO icon
8592
Cato Corp
CATO
$65.9M
– –
-472
Closed -$1.58K
CAVA icon
8593
CAVA Group
CAVA
$7.22B
– –
-38,526
Closed -$4.18M
CBSH icon
8594
CALL
Commerce Bancshares
CBSH
$8.5B
– –
-772
Closed -$45K
CBT icon
8595
PUT
Cabot Corp
CBT
$4.65B
– –
-1,900
Closed -$173K
CCB icon
8596
Coastal Financial
CCB
$1.1B
– –
-100
Closed -$8.74K
CCAP icon
8597
Crescent Capital BDC
CCAP
$399M
$0 ﹤0.01%
51
+27
+113% +$503
CCCC icon
8598
C4 Therapeutics
CCCC
$376M
– –
-6,871
Closed -$20.5K
CCEP icon
8599
Coca-Cola Europacific Partners
CCEP
$46.5B
– –
-6,536
Closed -$533K
CCEP icon
8600
PUT
Coca-Cola Europacific Partners
CCEP
$46.5B
– –
-11,600
Closed -$890K
342 343
344
345 346

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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.