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 | |
|---|---|---|---|---|---|---|
6451
PUT
Ameren
AEE
$30.4B
| $28K | ﹤0.01% |
300
-700
| -70% | -$68K |
|
6452
PUT
AnaptysBio
ANAB
$1.54B
| $28K | ﹤0.01% |
1,300
-4,500
| -78% | -$94.2K |
|
|
OPTU
6453
Optimum Communications Inc
OPTU
$298M
| $28K | ﹤0.01% |
+13,532
| New | +$31.7K |
|
6454
CALL
AZZ Inc
AZZ
$4.24B
| $28K | ﹤0.01% |
300
+100
| +50% | +$8.82K |
|
|
BLDP
6455
Ballard Power Systems
BLDP
$754M
| $28K | ﹤0.01% |
18,048
+10,098
| +127% | +$13.5K |
|
6456
PUT
Broadstone Net Lease
BNL
$4.25B
| $28K | ﹤0.01% |
1,800
-4,500
| -71% | -$72.1K |
|
6457
BRC Inc
BRCC
$122M
| $28K | ﹤0.01% |
21,555
+15,971
| +286% | +$29.5K |
|
6458
PUT
Baytex Energy
BTE
$2.96B
| $28K | ﹤0.01% |
16,100
+3,600
| +29% | +$6.3K |
|
6459
CALL
Custom Truck One Source
CTOS
$2.21B
| $28K | ﹤0.01% |
+5,700
| New | +$24.6K |
|
6460
Direxion Daily Healthcare Bull 3X ETF
CURE
$190M
| $28K | ﹤0.01% |
+357
| New | +$28.9K |
|
6461
CALL
iMGP DBi Managed Futures Strategy ETF
DBMF
$4B
| $28K | ﹤0.01% |
+1,100
| New | +$27.8K |
|
6462
Digi International
DGII
$2.47B
| $28K | ﹤0.01% |
825
+312
| +61% | +$9.54K |
|
6463
PUT
Gold Royalty Corp
GROY
$602M
| $28K | ﹤0.01% |
13,100
+10,100
| +337% | +$17.7K |
|
6464
Horizon Technology Finance
HRZN
$294M
| $28K | ﹤0.01% |
3,947
+3,060
| +345% | +$23.8K |
|
6465
CALL
Hancock Whitney
HWC
$6.19B
| $28K | ﹤0.01% |
500
| – | – |
|
|
JNPR
6466
CALL
DELISTED
Juniper Networks
JNPR
| $28K | ﹤0.01% |
44,100
-21,900
| -33% | -$785K |
|
6467
CALL
Limoneira
LMNR
$244M
| $28K | ﹤0.01% |
+1,800
| New | +$28.5K |
|
6468
PUT
MediaAlpha
MAX
$746M
| $28K | ﹤0.01% |
2,600
+2,400
| +1,200% | +$23.2K |
|
6469
CALL
Nomura Holdings
NMR
$28.3B
| $28K | ﹤0.01% |
+4,400
| New | +$25.7K |
|
|
NOTE
6470
PUT
DELISTED
FiscalNote
NOTE
| $28K | ﹤0.01% |
4,417
+1,734
| +65% | +$13K |
|
6471
CALL
NRC Health Common Stock
NRC
$412M
| $28K | ﹤0.01% |
1,700
+1,600
| +1,600% | +$21.6K |
|
6472
CALL
Pacira BioSciences
PCRX
$1.04B
| $28K | ﹤0.01% |
1,200
+700
| +140% | +$17.6K |
|
6473
PUT
Qualys
QLYS
$4.76B
| $28K | ﹤0.01% |
200
-300
| -60% | -$39.7K |
|
6474
QuickLogic
QUIK
$211M
| $28K | ﹤0.01% |
4,599
-1,809
| -28% | -$9.94K |
|
|
6475
PUT
QuickLogic
QUIK
$211M
| $28K | ﹤0.01% |
4,600
-1,400
| -23% | -$7.69K |
|
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.