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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
AREC icon
8451
PUT
American Resources Corp
AREC
$186M
– –
-500
Closed -$1K
ARES icon
8452
Ares Management
ARES
$28.5B
– –
-946
Closed -$163K
ARKK icon
8453
ARK Innovation ETF
ARKK
$5.89B
– –
-86,790
Closed -$4.93M
ARKO icon
8454
CALL
ARKO Corp
ARKO
$890M
– –
-2,600
Closed -$17K
ARKQ icon
8455
ARK Autonomous Technology & Robotics ETF
ARKQ
$1.88B
– –
-78
Closed -$6K
ARKW icon
8456
ARK Web x.0 ETF
ARKW
$1.64B
– –
-1,261
Closed -$136K
AROW icon
8457
Arrow Financial
AROW
$652M
$0 ﹤0.01%
+22
New +$588
ARRY icon
8458
Array Technologies
ARRY
$818M
– –
-24,731
Closed -$159K
ARW icon
8459
Arrow Electronics
ARW
$10.9B
– –
-46
Closed -$5.07K
ASAN icon
8460
Asana
ASAN
$1.58B
– –
-4,585
Closed -$87K
ASEA icon
8461
Global X FTSE Southeast Asia ETF
ASEA
$97.8M
$0 ﹤0.01%
16
-83
-84% -$1.32K
ASHS icon
8462
Xtrackers Harvest CSI 500 China A-Shares Small Cap ETF
ASHS
$32.6M
$0 ﹤0.01%
24
-904
-97% -$25.8K
ASLE icon
8463
AerSale
ASLE
$292M
– –
-20,719
Closed -$148K
ASIX icon
8464
CALL
AdvanSix
ASIX
$567M
– –
-500
Closed -$14K
ASML icon
8465
ASML
ASML
$675B
– –
-10,781
Closed -$7.84M
ASND icon
8466
Ascendis Pharma A/S
ASND
$16.7B
– –
-6,288
Closed -$898K
ASTL icon
8467
Algoma Steel
ASTL
$455M
– –
-5,426
Closed -$40.8K
ASUR icon
8468
PUT
Asure Software
ASUR
$220M
– –
-2,700
Closed -$25K
ATAI icon
8469
AtaiBeckley Inc
ATAI
$2.66B
– –
-121,984
Closed -$205K
LONA
8470
CALL
LeonaBio Inc
LONA
$69.4M
– –
-410
Closed -$2K
LONA
8471
LeonaBio Inc
LONA
$69.4M
$0 ﹤0.01%
32
-186
-85% -$824
LONA
8472
PUT
LeonaBio Inc
LONA
$69.4M
– –
-490
Closed -$2K
ATHM icon
8473
Autohome
ATHM
$2.43B
– –
-1,081
Closed -$30.7K
ATHM icon
8474
PUT
Autohome
ATHM
$2.43B
– –
-4,200
Closed -$108K
ATNI icon
8475
CALL
ATN International
ATNI
$361M
– –
-100
Closed -$1K
337 338
339
340 341

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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.