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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
BELFB
8526
Bel Fuse Inc Class B
BELFB
$3.88B
$0 ﹤0.01%
5
-9
-64% -$719
BEPC icon
8527
Brookfield Renewable
BEPC
$6.12B
– –
-18,964
Closed -$520K
BEP icon
8528
Brookfield Renewable
BEP
$10B
– –
-9,969
Closed -$223K
BFAM icon
8529
CALL
Bright Horizons
BFAM
$3.99B
– –
-200
Closed -$22K
BF.B icon
8530
Brown-Forman Class B
BF.B
$12B
– –
-23,579
Closed -$795K
BGSF icon
8531
CALL
BGSF Inc
BGSF
$59.1M
– –
-1,000
Closed -$5K
BGSF icon
8532
BGSF Inc
BGSF
$59.1M
$0 ﹤0.01%
97
-915
-90% -$4.33K
BGSF icon
8533
PUT
BGSF Inc
BGSF
$59.1M
– –
-1,000
Closed -$5K
BHF icon
8534
Brighthouse Financial
BHF
$3.63B
– –
-117
Closed -$6.54K
BBT
8535
Beacon Financial Corp
BBT
$2.53B
– –
-1,128
Closed -$32K
BHR
8536
CALL
Braemar Hotels & Resorts
BHR
$153M
– –
-13,900
Closed -$41K
BIB icon
8537
ProShares Ultra NASDAQ Biotechnology
BIB
$82.2M
– –
-67
Closed -$3K
CMRC
8538
Commerce.com Inc Series 1
CMRC
$224M
– –
-9,384
Closed -$59.6K
BIOX icon
8539
Bioceres Crop Solutions
BIOX
$21.9M
– –
-111
Closed -$611
BIZD icon
8540
VanEck BDC Income ETF
BIZD
$1.58B
– –
-3,352
Closed -$55K
BKCH icon
8541
Global X Blockchain ETF
BKCH
$219M
– –
-73
Closed -$3K
BKH icon
8542
Black Hills Corp
BKH
$5.73B
– –
-67
Closed -$3.97K
BLCN
8543
CALL
DELISTED
Siren ETF Trust Siren NexGen Economy ETF
BLCN
– –
-3,600
Closed -$92K
BLDP
8544
CALL
Ballard Power Systems
BLDP
$874M
– –
-2,100
Closed -$3K
BLFS icon
8545
PUT
BioLife Solutions
BLFS
$1.46B
– –
-400
Closed -$10K
BLKB icon
8546
CALL
Blackbaud
BLKB
$1.5B
– –
-5,800
Closed -$428K
BLND icon
8547
PUT
Blend Labs
BLND
$409M
– –
-1,000
Closed -$4K
BMRA icon
8548
Biomerica
BMRA
$4.9M
$0 ﹤0.01%
+185
New +$914
BNGO icon
8549
CALL
Bionano Genomics
BNGO
$12.7M
– –
-1,860
Closed -$9K
BNGO icon
8550
Bionano Genomics
BNGO
$12.7M
– –
-14
Closed –
340 341
342
343 344

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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.