Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
3826
Smith & Wesson
SWBI
$657M
| $373K | ﹤0.01% |
+43,019
| New | +$408K |
|
|
WCN
3827
CALL
Waste Connections
WCN
$42.7B
| $373K | ﹤0.01% |
2,000
+800
| +67% | +$154K |
|
3828
CALL
LiveWire
LVWR
$399M
| $372K | ﹤0.01% |
+81,000
| New | +$243K |
|
3829
CALL
Paysign
PAYS
$510M
| $372K | ﹤0.01% |
51,700
+7,100
| +16% | +$25.4K |
|
3830
TripAdvisor
TRIP
$1.74B
| $372K | ﹤0.01% |
28,571
-152,143
| -84% | -$2.03M |
|
3831
Absci
ABSI
$1.21B
| $371K | ﹤0.01% |
144,523
+55,395
| +62% | +$156K |
|
|
ILPT
3832
CALL
Industrial Logistics Properties Trust
ILPT
$603M
| $371K | ﹤0.01% |
81,700
+17,600
| +27% | +$58.3K |
|
3833
CALL
Par Pacific Holdings
PARR
$3.97B
| $371K | ﹤0.01% |
14,000
+13,600
| +3,400% | +$259K |
|
|
AD
3834
PUT
Array Digital Infrastructure
AD
$3.03B
| $371K | ﹤0.01% |
+5,800
| New | +$369K |
|
3835
CALL
ICU Medical
ICUI
$4.14B
| $370K | ﹤0.01% |
2,800
+2,400
| +600% | +$325K |
|
3836
CALL
Vuzix
VUZI
$187M
| $370K | ﹤0.01% |
127,000
-7,000
| -5% | -$16.5K |
|
3837
State Street Technology Select Sector SPDR ETF
XLK
$112B
| $370K | ﹤0.01% |
2,930
-98,496
| -97% | -$10.9M |
|
3838
CALL
iShares iBonds 2030 Term High Yield and Income ETF
IBHJ
$151M
| $369K | ﹤0.01% |
5,300
+4,800
| +960% | +$125K |
|
3839
PUT
Viper Energy
VNOM
$8.21B
| $369K | ﹤0.01% |
9,700
-51,200
| -84% | -$2.07M |
|
3840
CALL
Editas Medicine
EDIT
$402M
| $368K | ﹤0.01% |
167,700
+50,800
| +43% | +$83.1K |
|
3841
Legend Biotech
LEGN
$3.68B
| $368K | ﹤0.01% |
10,371
+1,847
| +22% | +$59.9K |
|
3842
McKesson
MCK
$104B
| $368K | ﹤0.01% |
+503
| New | +$355K |
|
3843
PUT
Ezcorp Inc
EZPW
$1.85B
| $367K | ﹤0.01% |
26,500
-7,400
| -22% | -$107K |
|
3844
CALL
W.R. Berkley
WRB
$28.3B
| $367K | ﹤0.01% |
5,000
-2,600
| -34% | -$186K |
|
3845
PUT
Atkore
ATKR
$2.62B
| $366K | ﹤0.01% |
5,200
-8,100
| -61% | -$525K |
|
3846
PUT
Energizer
ENR
$1.5B
| $366K | ﹤0.01% |
18,200
+9,000
| +98% | +$216K |
|
3847
CALL
Mitsubishi UFJ Financial
MUFG
$253B
| $366K | ﹤0.01% |
26,700
-37,400
| -58% | -$484K |
|
3848
PUT
Oxford Industries
OXM
$613M
| $366K | ﹤0.01% |
9,100
-62,300
| -87% | -$3.13M |
|
3849
PubMatic
PUBM
$605M
| $366K | ﹤0.01% |
29,432
+2,176
| +8% | +$22.9K |
|
3850
CALL
Old Republic International
ORI
$10.8B
| $365K | ﹤0.01% |
9,500
-2,800
| -23% | -$105K |
|
Similar funds
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.