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 | |
|---|---|---|---|---|---|---|
3326
Millicom
TIGO
$16B
| $590K | ﹤0.01% |
15,772
+14,851
| +1,612% | +$509K |
|
|
YSG
3327
CALL
Yatsen Holding
YSG
$318M
| $590K | ﹤0.01% |
61,300
+59,400
| +3,126% | +$340K |
|
3328
CALL
Telesat
TSAT
$575M
| $589K | ﹤0.01% |
24,100
-8,700
| -27% | -$153K |
|
3329
PureCycle Technologies
PCT
$1.2B
| $588K | ﹤0.01% |
+42,922
| New | +$380K |
|
3330
Ryder
R
$10.3B
| $588K | ﹤0.01% |
3,704
+3,589
| +3,121% | +$527K |
|
3331
CALL
Woodward
WWD
$25B
| $588K | ﹤0.01% |
2,400
-18,800
| -89% | -$3.85M |
|
3332
Goldman Sachs Physical Gold ETF Shares
AAAU
$2.48B
| $587K | ﹤0.01% |
17,974
+9,804
| +120% | +$318K |
|
3333
CALL
Mettler-Toledo International
MTD
$27B
| $587K | ﹤0.01% |
500
-700
| -58% | -$782K |
|
3334
CALL
Public Storage
PSA
$60.5B
| $586K | ﹤0.01% |
2,000
-6,600
| -77% | -$1.95M |
|
3335
United States Natural Gas Fund
UNG
$458M
| $586K | ﹤0.01% |
+38,361
| New | +$662K |
|
3336
Frontline
FRO
$8.59B
| $583K | ﹤0.01% |
35,536
-77,398
| -69% | -$1.31M |
|
3337
CALL
Ingersoll Rand
IR
$33.1B
| $582K | ﹤0.01% |
7,000
-14,600
| -68% | -$1.15M |
|
3338
PUT
Banco Santander
SAN
$200B
| $581K | ﹤0.01% |
70,000
+53,500
| +324% | +$398K |
|
3339
PUT
Genie Energy
GNE
$378M
| $580K | ﹤0.01% |
21,600
+20,100
| +1,340% | +$385K |
|
3340
CALL
Maravai LifeSciences
MRVI
$987M
| $580K | ﹤0.01% |
241,000
-263,400
| -52% | -$554K |
|
3341
PUT
Ocular Therapeutix
OCUL
$1.89B
| $580K | ﹤0.01% |
62,500
-41,900
| -40% | -$328K |
|
|
DCH
3342
Dauch Corp
DCH
$1.32B
| $579K | ﹤0.01% |
141,975
+140,107
| +7,500% | +$564K |
|
|
KEEL
3343
CALL
Keel Infrastructure Corp
KEEL
$2.45B
| $579K | ﹤0.01% |
689,900
-613,900
| -47% | -$567K |
|
|
HTT
3344
PUT
High Templar Tech Ltd
HTT
$376M
| $579K | ﹤0.01% |
184,500
-23,200
| -11% | -$64.4K |
|
3345
CALL
Axcelis
ACLS
$3.94B
| $578K | ﹤0.01% |
8,300
-10,600
| -56% | -$605K |
|
3346
CALL
HCI Group
HCI
$2.25B
| $578K | ﹤0.01% |
+3,800
| New | +$583K |
|
3347
CALL
NET Power
NPWR
$128M
| $578K | ﹤0.01% |
234,100
+224,200
| +2,265% | +$471K |
|
3348
CALL
Fiverr
FVRR
$398M
| $577K | ﹤0.01% |
19,700
-1,400
| -7% | -$40.3K |
|
3349
PUT
Sterling Infrastructure
STRL
$19.5B
| $576K | ﹤0.01% |
2,500
-9,700
| -80% | -$1.69M |
|
3350
Celldex Therapeutics
CLDX
$2.8B
| $575K | ﹤0.01% |
28,271
+26,233
| +1,287% | +$511K |
|
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.