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 | |
|---|---|---|---|---|---|---|
|
AIBU
5201
Direxion Daily AI and Big Data Bull 2X ETF
AIBU
$22.4M
| $104K | ﹤0.01% |
2,481
+1,844
| +289% | +$58.4K |
|
5202
AAR Corp
AIR
$5.56B
| $103K | ﹤0.01% |
+1,511
| New | +$90.7K |
|
5203
CALL
Astronics
ATRO
$3.38B
| $103K | ﹤0.01% |
3,720
+1,200
| +48% | +$28K |
|
5204
PUT
Brookdale Senior Living
BKD
$3.49B
| $103K | ﹤0.01% |
14,900
-8,000
| -35% | -$52K |
|
5205
Helmerich & Payne
HP
$3.37B
| $103K | ﹤0.01% |
6,799
+3,557
| +110% | +$65.2K |
|
5206
CALL
Intapp
INTA
$2.47B
| $103K | ﹤0.01% |
2,000
-800
| -29% | -$43.7K |
|
|
KLG
5207
DELISTED
WK Kellogg Co
KLG
| $103K | ﹤0.01% |
+6,479
| New | +$113K |
|
5208
PUT
NNN REIT
NNN
$9.16B
| $103K | ﹤0.01% |
2,400
-3,700
| -61% | -$154K |
|
5209
Portillo's
PTLO
$334M
| $103K | ﹤0.01% |
8,881
-23,790
| -73% | -$274K |
|
5210
PUT
Regenxbio
RGNX
$648M
| $103K | ﹤0.01% |
12,600
+7,600
| +152% | +$63.6K |
|
5211
PUT
Shoals Technologies Group
SHLS
$1.49B
| $103K | ﹤0.01% |
24,400
+3,200
| +15% | +$13.9K |
|
|
SY
5212
So-Young International
SY
$184M
| $103K | ﹤0.01% |
33,230
+33,059
| +19,333% | +$32.5K |
|
5213
PUT
Synaptics
SYNA
$4.25B
| $103K | ﹤0.01% |
1,600
-4,600
| -74% | -$271K |
|
5214
BioCryst Pharmaceuticals
BCRX
$2.35B
| $102K | ﹤0.01% |
11,484
-21,665
| -65% | -$202K |
|
5215
PUT
Babcock & Wilcox
BW
$1.41B
| $102K | ﹤0.01% |
106,800
+64,000
| +150% | +$43.7K |
|
5216
REX FANG & Innovation Equity Premium Income ETF
FEPI
$643M
| $102K | ﹤0.01% |
2,259
+379
| +20% | +$16.1K |
|
5217
PUT
FingerMotion
FNGR
$14.5M
| $102K | ﹤0.01% |
+50,600
| New | +$124K |
|
5218
CALL
IHS Holding
IHS
$2.76B
| $102K | ﹤0.01% |
+18,400
| New | +$99.1K |
|
5219
CALL
Kilroy Realty
KRC
$4.6B
| $102K | ﹤0.01% |
3,000
-500
| -14% | -$16.3K |
|
5220
CALL
Oshkosh
OSK
$8.82B
| $102K | ﹤0.01% |
900
-1,400
| -61% | -$136K |
|
5221
PUT
PSQ Holdings
PSQH
$13.9M
| $102K | ﹤0.01% |
3,327
-393
| -11% | -$12K |
|
|
TRVG
5222
trivago
TRVG
$378M
| $102K | ﹤0.01% |
27,310
+724
| +3% | +$2.98K |
|
|
NWECW
5223
CALL
DELISTED
NORTHWESTERN CORPORATION WARANTS
NWECW
| $102K | ﹤0.01% |
2,000
+900
| +82% | +$45.9K |
|
5224
Butterfly Network
BFLY
$2.14B
| $101K | ﹤0.01% |
50,540
+15,811
| +46% | +$36.3K |
|
5225
CALL
Corporacion America
CAAP
$4.26B
| $101K | ﹤0.01% |
5,000
+2,400
| +92% | +$47.2K |
|
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.