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 | |
|---|---|---|---|---|---|---|
|
COLO
4326
Global X MSCI Colombia ETF
COLO
$198M
| $238K | ﹤0.01% |
+8,278
| New | +$234K |
|
4327
PUT
MasTec
MTZ
$22.8B
| $238K | ﹤0.01% |
1,400
-20,600
| -94% | -$2.97M |
|
|
ZENA
4328
PUT
ZenaTech Inc
ZENA
$112M
| $238K | ﹤0.01% |
+65,100
| New | +$188K |
|
4329
PUT
AMN Healthcare
AMN
$1.35B
| $237K | ﹤0.01% |
11,500
-5,400
| -32% | -$112K |
|
4330
Canadian Solar
CSIQ
$927M
| $237K | ﹤0.01% |
21,521
-138,952
| -87% | -$1.34M |
|
4331
PUT
Vanguard S&P 500 Growth ETF
VOOG
$24.9B
| $237K | ﹤0.01% |
3,600
+1,200
| +50% | +$71.4K |
|
4332
PUT
Palladyne AI
PDYN
$229M
| $237K | ﹤0.01% |
27,400
-4,100
| -13% | -$29.1K |
|
|
CADE
4333
PUT
DELISTED
Cadence Bank
CADE
| $236K | ﹤0.01% |
7,400
| – | – |
|
|
EFC
4334
CALL
Ellington Financial
EFC
$1.69B
| $236K | ﹤0.01% |
18,200
+14,400
| +379% | +$183K |
|
|
GMS
4335
DELISTED
GMS Inc
GMS
| $236K | ﹤0.01% |
+2,175
| New | +$168K |
|
4336
iShares Global Clean Energy ETF
ICLN
$2.23B
| $236K | ﹤0.01% |
18,027
+1,910
| +12% | +$23.4K |
|
4337
PUT
Opendoor
OPEN
$3.69B
| $236K | ﹤0.01% |
457,560
-189,927
| -29% | -$137K |
|
4338
Axos Financial
AX
$5.59B
| $235K | ﹤0.01% |
+3,101
| New | +$210K |
|
4339
Bausch + Lomb
BLCO
$5.91B
| $235K | ﹤0.01% |
18,079
-6,716
| -27% | -$80.8K |
|
4340
PUT
Core & Main
CNM
$7.85B
| $235K | ﹤0.01% |
3,900
-29,100
| -88% | -$1.56M |
|
4341
GoPro
GPRO
$120M
| $235K | ﹤0.01% |
311,340
-22,699
| -7% | -$14.8K |
|
|
MASI
4342
CALL
DELISTED
Masimo
MASI
| $235K | ﹤0.01% |
1,400
-1,300
| -48% | -$208K |
|
4343
CALL
PubMatic
PUBM
$606M
| $235K | ﹤0.01% |
18,900
-16,900
| -47% | -$178K |
|
|
4344
CALL
Palladyne AI
PDYN
$229M
| $235K | ﹤0.01% |
27,200
-2,300
| -8% | -$16.3K |
|
4345
TransUnion
TRU
$15.9B
| $234K | ﹤0.01% |
+2,662
| New | +$222K |
|
|
HOLX
4346
DELISTED
Hologic
HOLX
| $233K | ﹤0.01% |
3,576
-8,948
| -71% | -$536K |
|
4347
VanEck High Yield Muni ETF
HYD
$4.45B
| $233K | ﹤0.01% |
4,642
+3,854
| +489% | +$192K |
|
4348
Dorian LPG
LPG
$1.94B
| $233K | ﹤0.01% |
9,589
+7,951
| +485% | +$176K |
|
|
TE
4349
PUT
T1 Energy
TE
$1.04B
| $233K | ﹤0.01% |
189,800
-16,000
| -8% | -$19.5K |
|
|
RZLV
4350
Rezolve AI
RZLV
$897M
| $233K | ﹤0.01% |
75,812
+73,959
| +3,991% | +$146K |
|
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.