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 | |
|---|---|---|---|---|---|---|
|
SVC
6051
PUT
Service Properties Trust
SVC
$1.05B
| $44K | ﹤0.01% |
3,740
-6,280
| -63% | -$67.8K |
|
|
TPH
6052
CALL
DELISTED
Tri Pointe Homes
TPH
| $44K | ﹤0.01% |
1,400
-19,000
| -93% | -$583K |
|
6053
PUT
Victory Capital Holdings
VCTR
$6.09B
| $44K | ﹤0.01% |
+700
| New | +$42.1K |
|
|
ETHU
6054
2x Ether ETF
ETHU
$735M
| $44K | ﹤0.01% |
789
-13,597
| -95% | -$650K |
|
|
SMC
6055
CALL
Summit Midstream
SMC
$420M
| $44K | ﹤0.01% |
1,800
+800
| +80% | +$22K |
|
6056
CALL
Alamo Group
ALG
$1.91B
| $43K | ﹤0.01% |
+200
| New | +$38.2K |
|
6057
Arcturus Therapeutics
ARCT
$165M
| $43K | ﹤0.01% |
3,320
-429
| -11% | -$5.07K |
|
6058
CALL
Atossa Therapeutics
ATOS
$23M
| $43K | ﹤0.01% |
3,533
+266
| +8% | +$3.18K |
|
|
OPTU
6059
PUT
Optimum Communications Inc
OPTU
$298M
| $43K | ﹤0.01% |
20,200
-2,100
| -9% | -$4.92K |
|
6060
Barnes & Noble Education
BNED
$435M
| $43K | ﹤0.01% |
3,699
-15,786
| -81% | -$168K |
|
6061
CALL
Cushman & Wakefield Ltd
CWK
$3.16B
| $43K | ﹤0.01% |
3,900
+2,700
| +225% | +$26.5K |
|
6062
CALL
Equity Lifestyle Properties
ELS
$13.1B
| $43K | ﹤0.01% |
700
+200
| +40% | +$12.8K |
|
6063
CALL
Freedom Holding
FRHC
$9.44B
| $43K | ﹤0.01% |
300
+200
| +200% | +$29.5K |
|
6064
CALL
Fulton Financial
FULT
$4.68B
| $43K | ﹤0.01% |
2,400
-1,500
| -38% | -$25.6K |
|
|
XRN
6065
Chiron Real Estate Inc
XRN
$535M
| $43K | ﹤0.01% |
1,253
+806
| +180% | +$28.1K |
|
|
GNTY
6066
DELISTED
Guaranty Bancshares
GNTY
| $43K | ﹤0.01% |
+1,034
| New | +$41.8K |
|
6067
Heritage Financial
HFWA
$1.22B
| $43K | ﹤0.01% |
+1,815
| New | +$41.8K |
|
6068
CALL
LENSAR
LNSR
$64.5M
| $43K | ﹤0.01% |
3,300
+200
| +6% | +$2.7K |
|
6069
PUT
Middlesex Water
MSEX
$1.07B
| $43K | ﹤0.01% |
+800
| New | +$47.4K |
|
6070
CALL
Nuvation Bio
NUVB
$2.29B
| $43K | ﹤0.01% |
22,400
+20,800
| +1,300% | +$43.3K |
|
6071
PUT
OneSpan
OSPN
$584M
| $43K | ﹤0.01% |
2,600
+500
| +24% | +$7.76K |
|
6072
CALL
Pangaea Logistics
PANL
$484M
| $43K | ﹤0.01% |
9,200
+8,900
| +2,967% | +$39.5K |
|
6073
CALL
Philips
PHG
$25.5B
| $43K | ﹤0.01% |
1,867
-10,781
| -85% | -$242K |
|
6074
Palomar
PLMR
$3.79B
| $43K | ﹤0.01% |
280
+111
| +66% | +$17.2K |
|
6075
PUT
Pulse Biosciences
PLSE
$2.37B
| $43K | ﹤0.01% |
2,900
-500
| -15% | -$8.3K |
|
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.