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 | |
|---|---|---|---|---|---|---|
5226
CALL
Churchill Downs
CHDN
$5.76B
| $101K | ﹤0.01% |
1,000
-1,100
| -52% | -$108K |
|
|
CPRX
5227
CALL
DELISTED
Catalyst Pharmaceutical
CPRX
| $101K | ﹤0.01% |
4,700
-9,800
| -68% | -$231K |
|
|
AGNT
5228
PUT
AGNT Inc
AGNT
$641M
| $101K | ﹤0.01% |
11,200
+2,700
| +32% | +$23.6K |
|
5229
Gray Television
GTN
$417M
| $101K | ﹤0.01% |
22,424
+8,099
| +57% | +$31.4K |
|
5230
NewAmsterdam Pharma
NAMS
$3.33B
| $101K | ﹤0.01% |
5,604
+3,076
| +122% | +$56.1K |
|
5231
Rocket Pharmaceuticals
RCKT
$351M
| $101K | ﹤0.01% |
+41,379
| New | +$210K |
|
5232
AngioDynamics
ANGO
$610M
| $100K | ﹤0.01% |
10,120
+1,715
| +20% | +$16.8K |
|
5233
Brookdale Senior Living
BKD
$3.49B
| $100K | ﹤0.01% |
14,444
-7,920
| -35% | -$51.5K |
|
5234
Cognex
CGNX
$10.4B
| $100K | ﹤0.01% |
3,162
-2,400
| -43% | -$68.8K |
|
5235
Fortune Brands Innovations
FBIN
$5.88B
| $100K | ﹤0.01% |
+1,948
| New | +$102K |
|
5236
CALL
The Honest Company
HNST
$409M
| $100K | ﹤0.01% |
19,700
-10,200
| -34% | -$48.9K |
|
5237
CALL
Kulicke & Soffa
KLIC
$4.62B
| $100K | ﹤0.01% |
2,900
-11,500
| -80% | -$374K |
|
5238
CALL
La-Z-Boy
LZB
$1.61B
| $100K | ﹤0.01% |
2,700
-9,300
| -78% | -$372K |
|
5239
PUT
Sky Harbour Group
SKYH
$361M
| $100K | ﹤0.01% |
10,300
-5,300
| -34% | -$57.3K |
|
5240
CALL
Verastem
VSTM
$536M
| $100K | ﹤0.01% |
24,100
-21,800
| -47% | -$137K |
|
|
ARDT
5241
Ardent Health
ARDT
$1.54B
| $100K | ﹤0.01% |
7,354
+6,666
| +969% | +$89.7K |
|
5242
CALL
Consensus Cloud Solutions
CCSI
$657M
| $99K | ﹤0.01% |
4,300
-600
| -12% | -$12.9K |
|
5243
CALL
Carlyle Secured Lending
CGBD
$702M
| $99K | ﹤0.01% |
7,300
-2,600
| -26% | -$37K |
|
5244
loanDepot
LDI
$542M
| $99K | ﹤0.01% |
+77,958
| New | +$95.3K |
|
|
MVO
5245
PUT
DELISTED
MV Oil Trust
MVO
| $99K | ﹤0.01% |
17,300
+17,100
| +8,550% | +$99.2K |
|
|
NUVL
5246
CALL
DELISTED
Nuvalent
NUVL
| $99K | ﹤0.01% |
1,300
-9,900
| -88% | -$724K |
|
|
PBPB
5247
DELISTED
Potbelly
PBPB
| $99K | ﹤0.01% |
+8,140
| New | +$80K |
|
5248
Post Holdings
POST
$4.21B
| $99K | ﹤0.01% |
917
+263
| +40% | +$29.5K |
|
5249
Procept Biorobotics
PRCT
$1.02B
| $99K | ﹤0.01% |
1,732
-4,790
| -73% | -$271K |
|
5250
CALL
Sprott Junior Gold Miners ETF
SGDJ
$276M
| $99K | ﹤0.01% |
2,200
+2,100
| +2,100% | +$98.4K |
|
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.