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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
+21.82%
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
$175B
AUM Growth
+$18.5B
Cap. Flow
-$10.5B
Cap. Flow %
-6.03%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,525
Increased
3,308
Reduced
3,590
Closed
1,431

Top Buys

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$172M
2
AAPL icon
Apple
AAPL
+$156M
3
AVGO icon
Broadcom
AVGO
+$101M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$57.2M
5
UNH icon
UnitedHealth
UNH
+$55.1M

Top Sells

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$140M
2
AMZN icon
Amazon
AMZN
+$47.9M
3
NFLX icon
Netflix
NFLX
+$38.3M
4
TSM icon
TSMC
TSM
+$37.3M
5
PFE icon
Pfizer
PFE
+$36.9M

Sector Composition

Rank Sector Weight
1 Technology 0.74%
2 Communication Services 0.19%
3 Consumer Discretionary 0.18%
4 Healthcare 0.17%
5 Financials 0.14%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
BCH icon
8626
Banco de Chile
BCH
$20.6B
– –
-29
Closed –
BCO icon
8627
CALL
Brink's
BCO
$5.02B
– –
-300
Closed -$25K
BCO icon
8628
Brink's
BCO
$5.02B
– –
-52
Closed -$4.53K
BDC icon
8629
Belden
BDC
$4B
– –
-19
Closed -$2K
BDSX icon
8630
CALL
Biodesix
BDSX
$228M
– –
-370
Closed -$1K
BDTX icon
8631
PUT
Black Diamond Therapeutics
BDTX
$101M
– –
-700
Closed -$1K
BEEM icon
8632
PUT
Beam Global
BEEM
$22.4M
– –
-800
Closed -$1K
BEKE icon
8633
KE Holdings
BEKE
$16.8B
– –
-570,560
Closed -$11M
BELFB
8634
Bel Fuse Inc Class B
BELFB
$3.88B
– –
-5
Closed -$377
BEN icon
8635
Franklin Resources
BEN
$16.9B
– –
-34,775
Closed -$717K
BFAM icon
8636
Bright Horizons
BFAM
$3.99B
– –
-75
Closed -$9K
BGSF icon
8637
BGSF Inc
BGSF
$59.1M
– –
-97
Closed -$391
BILS icon
8638
State Street SPDR Bloomberg 3-12 Month T-Bill ETF
BILS
$3.84B
– –
-100
Closed -$9K
BIS icon
8639
ProShares UltraShort NASDAQ Biotechnology
BIS
$2.3M
$0 ﹤0.01%
+3
New +$115
BITO icon
8640
ProShares Bitcoin Strategy ETF
BITO
$1.4B
– –
-138,514
Closed -$2.54M
BJRI icon
8641
BJ's Restaurants
BJRI
$1.41B
– –
-3,452
Closed -$136K
BKE icon
8642
Buckle
BKE
$2.19B
– –
-3,949
Closed -$156K
BKLN icon
8643
Invesco Senior Loan ETF
BKLN
$7.1B
– –
-2,396
Closed -$49K
BL icon
8644
BlackLine
BL
$1.69B
– –
-1,774
Closed -$91.6K
BLBD icon
8645
Blue Bird Corp
BLBD
$2.41B
– –
-19,045
Closed -$725K
BLDP
8646
PUT
Ballard Power Systems
BLDP
$874M
– –
-1,800
Closed -$1K
BLDR icon
8647
Builders FirstSource
BLDR
$7.84B
– –
-2,341
Closed -$270K
BLFS icon
8648
BioLife Solutions
BLFS
$1.46B
$0 ﹤0.01%
+42
New +$947
BLK icon
8649
Blackrock
BLK
$164B
– –
-1,931
Closed -$1.83M
BLUE
8650
CALL
DELISTED
bluebird bio
BLUE
– –
-563,500
Closed -$2.75M
344 345
346
347 348

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Simplex Trading's Q2 2025 Portfolio in Review

As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.

Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.

  • Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
  • Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
  • Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
  • Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
  • Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
  • Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
  • Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.

Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.