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 |
Netflix
NFLX
|
+$73.1M |
| 2 |
Western Digital
WDC
|
+$51.8M |
| 3 |
iShares Semiconductor ETF
SOXX
|
+$46M |
| 4 |
Meta Platforms (Facebook)
META
|
+$41.8M |
| 5 |
Alibaba
BABA
|
+$37.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$262M |
| 2 |
Microsoft
MSFT
|
+$194M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$149M |
| 4 |
Apple
AAPL
|
+$119M |
| 5 |
Amazon
AMZN
|
+$107M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.59% |
| 2 | Consumer Discretionary | 0.21% |
| 3 | Healthcare | 0.2% |
| 4 | Industrials | 0.18% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
BTCL
7351
PUT
T-Rex 2X Long Bitcoin Daily Target ETF
BTCL
$22.2M
| $5.77K | ﹤0.01% |
400
| – | – |
|
7352
CALL
Frontdoor
FTDR
$5.27B
| $5.77K | ﹤0.01% |
100
-1,400
| -93% | -$82.3K |
|
|
EWCZ
7353
PUT
DELISTED
European Wax Center
EWCZ
| $5.76K | ﹤0.01% |
1,600
-16,800
| -91% | -$62.8K |
|
|
BTOP
7354
CALL
DELISTED
Bitwise Bitcoin and Ether Equal Weight Strategy ETF
BTOP
| $5.75K | ﹤0.01% |
+200
| New | +$6.38K |
|
|
KW
7355
DELISTED
Kennedy-Wilson Holdings
KW
| $5.75K | ﹤0.01% |
595
-3,815
| -87% | -$34.2K |
|
|
PVL
7356
Permianville Royalty Trust
PVL
$55.8M
| $5.73K | ﹤0.01% |
3,185
+391
| +14% | +$706 |
|
7357
Choice Hotels
CHH
$5.26B
| $5.71K | ﹤0.01% |
60
-1,172
| -95% | -$112K |
|
7358
PUT
Organogenesis Holdings
ORGO
$324M
| $5.7K | ﹤0.01% |
1,100
-1,900
| -63% | -$9.21K |
|
7359
Westamerica Bancorp
WABC
$1.39B
| $5.69K | ﹤0.01% |
+119
| New | +$5.71K |
|
7360
El Pollo Loco
LOCO
$503M
| $5.69K | ﹤0.01% |
544
-4,821
| -90% | -$49.8K |
|
7361
PUT
VOC Energy
VOC
$56.4M
| $5.67K | ﹤0.01% |
2,100
| – | – |
|
|
BCYC
7362
CALL
Bicycle Therapeutics
BCYC
$269M
| $5.66K | ﹤0.01% |
800
-9,500
| -92% | -$70K |
|
7363
PUT
Fidelity National Financial
FNF
$14.4B
| $5.66K | ﹤0.01% |
800
-1,700
| -68% | -$96.8K |
|
7364
InspireMD
NSPR
$31.4M
| $5.65K | ﹤0.01% |
3,175
+2,713
| +587% | +$5.66K |
|
|
VIVO
7365
VivoPower PLC
VIVO
$97.4M
| $5.64K | ﹤0.01% |
2,489
-3,264
| -57% | -$11.2K |
|
7366
CALL
Design Therapeutics
DSGN
$751M
| $5.63K | ﹤0.01% |
600
-600
| -50% | -$4.7K |
|
7367
CALL
Myers Industries
MYE
$1.24B
| $5.62K | ﹤0.01% |
+300
| New | +$5.33K |
|
7368
PUT
Telos
TLS
$331M
| $5.61K | ﹤0.01% |
1,100
-100
| -8% | -$624 |
|
|
AIFU
7369
CALL
AIFU Inc
AIFU
$193M
| $5.61K | ﹤0.01% |
105
-50
| -32% | -$3.85K |
|
|
FIRY
7370
PUT
Firy Inc
FIRY
$154M
| $5.6K | ﹤0.01% |
1,300
-11,400
| -90% | -$70.4K |
|
7371
CALL
Arlo Technologies
ARLO
$1.58B
| $5.6K | ﹤0.01% |
400
-16,600
| -98% | -$261K |
|
7372
PUT
FormFactor
FORM
$6.51B
| $5.58K | ﹤0.01% |
100
-1,300
| -93% | -$65.5K |
|
|
CEGX
7373
Tradr 2X Long CEG Daily ETF
CEGX
$19.3M
| $5.57K | ﹤0.01% |
199
-174
| -47% | -$5.37K |
|
7374
CALL
Outset Medical
OM
$86.4M
| $5.57K | ﹤0.01% |
1,500
+100
| +7% | +$858 |
|
7375
PUT
Pharvaris
PHVS
$2.28B
| $5.55K | ﹤0.01% |
+200
| New | +$4.82K |
|
Similar funds
Simplex Trading's Q4 2025 Portfolio in Review
As of Q4 2025, Simplex Trading held 10,526 positions worth $177B, down 9% from $195B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading withdrew a net $23.2B in Q4 2025, closing 2,184 positions and reducing 4,088 holdings. Its most notable exit was iShares Russell 2000 ETF, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.59% of assets, down from 0.79% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Western Digital worth $58.9M.
- Simplex Trading's largest Q4 2025 buy was Western Digital: 341,762 shares worth $58.9M.
- Simplex Trading added most to Netflix in Q4 2025, an estimated $73.1M increase.
- Simplex Trading's biggest Q4 2025 reduction was NVIDIA, cutting an estimated $262M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2025, selling an estimated $149M.
- Simplex Trading's ten largest holdings make up 49% of its $177B portfolio in Q4 2025.
- Simplex Trading opened 1,476 new positions and closed 2,184 in Q4 2025.
- Simplex Trading's portfolio value fell 9% quarter-over-quarter to $177B.
Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.