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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
HOLO icon
9101
PUT
MicroCloud Hologram
HOLO
$36.4M
– –
-245
Closed -$4K
HOMB icon
9102
Home BancShares
HOMB
$6.16B
– –
-3,054
Closed -$85K
HOMB icon
9103
PUT
Home BancShares
HOMB
$6.16B
– –
-16,800
Closed -$474K
HON icon
9104
Honeywell
HON
$78B
– –
-50,085
Closed -$10.1M
HOOK
9105
DELISTED
HOOKIPA Pharma
HOOK
$0 ﹤0.01%
+341
New +$421
HOWL icon
9106
CALL
Werewolf Therapeutics
HOWL
$17.5M
– –
-3,400
Closed -$3K
HPQ icon
9107
HP
HPQ
$22.4B
– –
-4,502
Closed -$115K
HSAI
9108
Hesai Group
HSAI
$2.32B
– –
-38,595
Closed -$679K
HSBC icon
9109
HSBC
HSBC
$349B
– –
-37,320
Closed -$2.12M
HSY icon
9110
Hershey
HSY
$34.9B
– –
-5,145
Closed -$848K
HTBK
9111
DELISTED
Heritage Commerce
HTBK
– –
-453
Closed -$4.15K
HTOO icon
9112
Fusion Fuel Green
HTOO
$8.74M
$0 ﹤0.01%
+3
New +$28
HUBB icon
9113
PUT
Hubbell
HUBB
$25.8B
– –
-3,500
Closed -$1.16M
AGIG
9114
Abundia Global Impact Group
AGIG
$45.3M
– –
-2,877
Closed -$22K
HUYA
9115
Huya Inc
HUYA
$551M
– –
-562,323
Closed -$2.04M
HVT icon
9116
Haverty Furniture Companies
HVT
$398M
– –
-4,227
Closed -$82.6K
HY icon
9117
Hyster-Yale Materials Handling
HY
$594M
– –
-77
Closed -$3.07K
HYMC icon
9118
Hycroft Mining Holding Corp
HYMC
$1.87B
– –
-5,139
Closed -$16.8K
HYMB icon
9119
State Street SPDR Nuveen ICE High Yield Municipal Bond ETF
HYMB
$3.06B
– –
-1,548
Closed -$39K
HZO icon
9120
MarineMax
HZO
$739M
– –
-256
Closed -$5.67K
IART icon
9121
Integra LifeSciences
IART
$1.44B
– –
-935
Closed -$13.6K
IART icon
9122
PUT
Integra LifeSciences
IART
$1.44B
– –
-1,000
Closed -$21K
IBKR icon
9123
Interactive Brokers
IBKR
$40.9B
– –
-22,264
Closed -$1.06M
IBM icon
9124
IBM
IBM
$194B
– –
-15,625
Closed -$4.03M
IBN icon
9125
ICICI Bank
IBN
$105B
– –
-116,892
Closed -$3.87M
363 364
365
366 367

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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.