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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
IMMP
9151
Immutep
IMMP
$57.8M
$0 ﹤0.01%
61
+10
+20% +$17
IMO icon
9152
Imperial Oil
IMO
$62.3B
– –
-2,407
Closed -$172K
IMPP icon
9153
Imperial Petroleum
IMPP
$220M
– –
-19,950
Closed -$54.9K
IMUX icon
9154
PUT
Immunic
IMUX
$195M
– –
-960
Closed -$10K
IMXI icon
9155
CALL
International Money Express
IMXI
$401M
– –
-3,000
Closed -$37K
INCR
9156
Intercure
INCR
$54.5M
$0 ﹤0.01%
+240
New +$355
INFU icon
9157
CALL
InfuSystem Holdings
INFU
$179M
– –
-300
Closed -$1K
ING icon
9158
ING
ING
$92.7B
– –
-9,703
Closed -$196K
INO icon
9159
Inovio Pharmaceuticals
INO
$83.9M
– –
-8,176
Closed -$15.7K
INSE icon
9160
Inspired Entertainment
INSE
$175M
– –
-1,985
Closed -$15.4K
INSM icon
9161
Insmed
INSM
$23.3B
– –
-14,467
Closed -$1.11M
INZY
9162
DELISTED
Inozyme Pharma
INZY
– –
-16,349
Closed -$40.5K
IONQ icon
9163
IonQ
IONQ
$12.7B
– –
-505
Closed -$16.9K
IPGP icon
9164
CALL
IPG Photonics
IPGP
$4.09B
– –
-200
Closed -$12K
IPGP icon
9165
PUT
IPG Photonics
IPGP
$4.09B
– –
-200
Closed -$12K
IQ icon
9166
iQIYI
IQ
$1.17B
– –
-202,804
Closed -$365K
IQV icon
9167
IQVIA
IQV
$34.6B
– –
-2,847
Closed -$429K
IRBT
9168
DELISTED
iRobot
IRBT
– –
-82,058
Closed -$227K
IRIX icon
9169
IRIDEX
IRIX
$16M
– –
-125
Closed –
IRMD icon
9170
iRadimed
IRMD
$1.2B
– –
-907
Closed -$47K
IRMD icon
9171
PUT
iRadimed
IRMD
$1.2B
– –
-2,300
Closed -$120K
IRS
9172
IRSA Inversiones y Representaciones
IRS
$1.28B
– –
-1,444
Closed -$20.6K
IRWD icon
9173
Ironwood Pharmaceuticals
IRWD
$624M
$0 ﹤0.01%
776
-1,703
-69% -$1.34K
ISPY icon
9174
ProShares S&P 500 High Income ETF
ISPY
$1.23B
$0 ﹤0.01%
+22
New +$880
ITGR icon
9175
PUT
Integer Holdings
ITGR
$3.31B
– –
-100
Closed -$11K
365 366
367
368 369

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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.