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 | |
|---|---|---|---|---|---|---|
2576
CALL
BioCryst Pharmaceuticals
BCRX
$2.37B
| $1.22M | ﹤0.01% |
136,200
+75,900
| +126% | +$707K |
|
2577
PUT
Axcelis
ACLS
$4.12B
| $1.22M | ﹤0.01% |
17,500
+8,300
| +90% | +$474K |
|
2578
EOG Resources
EOG
$78B
| $1.22M | ﹤0.01% |
+10,192
| New | +$1.16M |
|
2579
Global E Online
GLBE
$6.08B
| $1.22M | ﹤0.01% |
36,352
-3,242
| -8% | -$109K |
|
2580
CALL
Amkor Technology
AMKR
$16.1B
| $1.22M | ﹤0.01% |
58,000
-45,000
| -44% | -$830K |
|
2581
PUT
Northern Trust
NTRS
$22.2B
| $1.22M | ﹤0.01% |
9,600
-17,700
| -65% | -$1.81M |
|
|
AKRO
2582
PUT
DELISTED
Akero Therapeutics
AKRO
| $1.22M | ﹤0.01% |
22,800
-55,000
| -71% | -$2.5M |
|
2583
PUT
Clover Health Investments
CLOV
$2.28B
| $1.22M | ﹤0.01% |
436,100
+132,900
| +44% | +$437K |
|
|
EUAD
2584
Select STOXX Europe Aerospace & Defense ETF
EUAD
$1.14B
| $1.21M | ﹤0.01% |
+28,140
| New | +$1.05M |
|
2585
Compass Minerals
CMP
$1.24B
| $1.21M | ﹤0.01% |
60,396
+37,736
| +167% | +$610K |
|
2586
Nektar Therapeutics
NKTR
$2.39B
| $1.21M | ﹤0.01% |
46,953
+24,024
| +105% | +$270K |
|
|
DAY
2587
PUT
DELISTED
Dayforce
DAY
| $1.21M | ﹤0.01% |
21,900
+3,200
| +17% | +$183K |
|
2588
PUT
ICICI Bank
IBN
$106B
| $1.21M | ﹤0.01% |
36,000
-20,500
| -36% | -$678K |
|
2589
Keros Therapeutics
KROS
$199M
| $1.21M | ﹤0.01% |
90,735
+20,223
| +29% | +$273K |
|
|
VNET
2590
CALL
VNET Group
VNET
$2.05B
| $1.21M | ﹤0.01% |
175,400
-71,800
| -29% | -$430K |
|
2591
CALL
US Foods
USFD
$21.4B
| $1.21M | ﹤0.01% |
15,700
-40,000
| -72% | -$2.85M |
|
|
ETH
2592
CALL
Grayscale Ethereum Staking Mini ETF Shares
ETH
$1.7B
| $1.21M | ﹤0.01% |
+50,900
| New | +$1.05M |
|
2593
CALL
Intellia Therapeutics
NTLA
$1.5B
| $1.21M | ﹤0.01% |
128,600
+32,100
| +33% | +$264K |
|
2594
PUT
Qorvo
QRVO
$7.63B
| $1.21M | ﹤0.01% |
14,200
-48,900
| -77% | -$3.53M |
|
|
HPP
2595
PUT
Hudson Pacific Properties
HPP
$834M
| $1.2M | ﹤0.01% |
62,786
+41,972
| +202% | +$681K |
|
2596
PUT
Louisiana-Pacific
LPX
$5.2B
| $1.2M | ﹤0.01% |
14,000
+1,900
| +16% | +$169K |
|
2597
CALL
Polaris
PII
$4.15B
| $1.2M | ﹤0.01% |
29,600
-33,500
| -53% | -$1.26M |
|
2598
UBS Group
UBS
$170B
| $1.2M | ﹤0.01% |
35,546
+3,283
| +10% | +$102K |
|
2599
CALL
Hawaiian Electric Industries
HE
$2.33B
| $1.2M | ﹤0.01% |
112,900
-89,100
| -44% | -$930K |
|
2600
PUT
Bank OZK
OZK
$5.49B
| $1.2M | ﹤0.01% |
25,500
-120,600
| -83% | -$5.28M |
|
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.