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 | |
|---|---|---|---|---|---|---|
5251
Vanguard Russell 1000 Growth ETF
VONG
$42.5B
| $99K | ﹤0.01% |
+908
| New | +$89.4K |
|
|
IELG
5252
CALL
DELISTED
ISHARES ENHANCED U.S. LARGE CAP ETF
IELG
| $99K | ﹤0.01% |
5,000
+900
| +22% | +$17.8K |
|
|
BDN
5253
Brandywine Realty Trust
BDN
$525M
| $98K | ﹤0.01% |
22,963
+1,988
| +9% | +$8.26K |
|
|
DHC
5254
Diversified Healthcare Trust
DHC
$2.17B
| $98K | ﹤0.01% |
27,499
+22,469
| +447% | +$64.8K |
|
5255
ProShares UltraShort Dow 30
DXD
$42.6M
| $98K | ﹤0.01% |
4,074
+3,035
| +292% | +$83.9K |
|
5256
Neonode
NEON
$13.4M
| $98K | ﹤0.01% |
3,859
-20,525
| -84% | -$245K |
|
5257
PUT
Pinnacle West Capital
PNW
$12.3B
| $98K | ﹤0.01% |
1,100
-7,800
| -88% | -$713K |
|
5258
Under Armour Class C
UA
$2.85B
| $98K | ﹤0.01% |
15,188
+1,123
| +8% | +$6.63K |
|
5259
PUT
WPP
WPP
$4.41B
| $98K | ﹤0.01% |
2,800
+900
| +47% | +$33.7K |
|
5260
CALL
Celldex Therapeutics
CLDX
$3.02B
| $97K | ﹤0.01% |
4,800
-2,400
| -33% | -$46.7K |
|
5261
Elbit Systems
ESLT
$36.8B
| $97K | ﹤0.01% |
216
-7,702
| -97% | -$3.12M |
|
5262
CALL
Fresenius Medical Care
FMS
$13.8B
| $97K | ﹤0.01% |
3,400
-25,800
| -88% | -$692K |
|
5263
Freshworks
FRSH
$3.11B
| $97K | ﹤0.01% |
6,569
-15,002
| -70% | -$216K |
|
5264
Globant
GLOB
$1.57B
| $97K | ﹤0.01% |
1,077
+657
| +156% | +$70.2K |
|
|
ADAM
5265
CALL
Adamas Trust
ADAM
$804M
| $97K | ﹤0.01% |
14,500
-6,300
| -30% | -$40K |
|
5266
Ocean Power Technologies
OPTT
$43.5M
| $97K | ﹤0.01% |
204,516
+119,900
| +142% | +$56.9K |
|
5267
Stellus Capital Investment Corp
SCM
$216M
| $97K | ﹤0.01% |
+7,019
| New | +$92.7K |
|
5268
CALL
Kyverna Therapeutics
KYTX
$455M
| $97K | ﹤0.01% |
+31,600
| New | +$78.2K |
|
|
ETHW
5269
PUT
Bitwise Ethereum ETF
ETHW
$201M
| $97K | ﹤0.01% |
+5,400
| New | +$85.1K |
|
5270
Apogee Enterprises
APOG
$832M
| $96K | ﹤0.01% |
2,380
+2,102
| +756% | +$86.8K |
|
5271
CALL
Archrock
AROC
$6.21B
| $96K | ﹤0.01% |
3,900
+1,700
| +77% | +$41.7K |
|
5272
PUT
Butterfly Network
BFLY
$2.18B
| $96K | ﹤0.01% |
48,400
-13,200
| -21% | -$30.3K |
|
5273
PUT
Bio-Rad Laboratories Class A
BIO
$8.74B
| $96K | ﹤0.01% |
400
-700
| -64% | -$165K |
|
5274
PUT
FormFactor
FORM
$8.21B
| $96K | ﹤0.01% |
2,800
+1,000
| +56% | +$30.4K |
|
5275
Fortrea Holdings
FTRE
$1.81B
| $96K | ﹤0.01% |
+19,515
| New | +$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.