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 | |
|---|---|---|---|---|---|---|
3326
BHP
BHP
$209B
| $487K | ﹤0.01% |
8,070
+1,647
| +26% | +$93.6K |
|
3327
PUT
Ashland
ASH
$3.11B
| $487K | ﹤0.01% |
8,300
-3,100
| -27% | -$164K |
|
3328
Amer Sports
AS
$20.5B
| $487K | ﹤0.01% |
+13,037
| New | +$447K |
|
3329
CALL
Fiverr
FVRR
$421M
| $486K | ﹤0.01% |
24,600
+4,700
| +24% | +$101K |
|
3330
CALL
Corvus Pharmaceuticals
CRVS
$1.06B
| $486K | ﹤0.01% |
63,100
+16,100
| +34% | +$127K |
|
3331
PUT
Digital Turbine
APPS
$1.01B
| $485K | ﹤0.01% |
97,000
-18,600
| -16% | -$105K |
|
3332
Eagle Bancorp
EGBN
$845M
| $485K | ﹤0.01% |
22,635
+18,512
| +449% | +$357K |
|
3333
NovaGold Resources
NG
$2.51B
| $484K | ﹤0.01% |
+51,957
| New | +$482K |
|
3334
Union Pacific
UNP
$179B
| $483K | ﹤0.01% |
+2,090
| New | +$477K |
|
3335
PUT
NOV
NOV
$7.25B
| $483K | ﹤0.01% |
30,900
-30,200
| -49% | -$448K |
|
3336
MBIA
MBI
$279M
| $483K | ﹤0.01% |
67,452
-188,188
| -74% | -$1.36M |
|
3337
CALL
Snap-on
SNA
$21.7B
| $482K | ﹤0.01% |
1,400
-100
| -7% | -$34.2K |
|
3338
PUT
Kimco Realty
KIM
$17.9B
| $482K | ﹤0.01% |
23,800
-5,900
| -20% | -$123K |
|
3339
FerroAtlántica
GSM
$615M
| $482K | ﹤0.01% |
103,847
-78,925
| -43% | -$364K |
|
3340
CALL
Texas Roadhouse
TXRH
$13.4B
| $481K | ﹤0.01% |
2,900
-5,800
| -67% | -$981K |
|
3341
CALL
Xerox
XRX
$354M
| $481K | ﹤0.01% |
202,900
+33,200
| +20% | +$98.3K |
|
3342
CALL
Mistras Group
MG
$489M
| $481K | ﹤0.01% |
38,000
+34,100
| +874% | +$385K |
|
3343
PUT
Entergy
ETR
$53.5B
| $481K | ﹤0.01% |
5,200
-17,200
| -77% | -$1.63M |
|
|
ABX
3344
Abacus Global Management
ABX
$1.01B
| $480K | ﹤0.01% |
56,194
+32,910
| +141% | +$217K |
|
3345
CALL
Targa Resources
TRGP
$56.3B
| $480K | ﹤0.01% |
2,600
-22,000
| -89% | -$3.71M |
|
3346
CALL
iRhythm Holdings
IRTC
$3.77B
| $479K | ﹤0.01% |
2,700
+1,300
| +93% | +$230K |
|
3347
IQVIA
IQV
$39.7B
| $479K | ﹤0.01% |
2,124
-9,150
| -81% | -$1.99M |
|
3348
CALL
Arbutus Biopharma
ABUS
$867M
| $478K | ﹤0.01% |
99,400
+15,500
| +18% | +$69.7K |
|
3349
CALL
Immunovant
IMVT
$8.01B
| $478K | ﹤0.01% |
18,800
+3,800
| +25% | +$84.7K |
|
|
SMLR
3350
PUT
DELISTED
Semler Scientific
SMLR
| $477K | ﹤0.01% |
31,200
-4,700
| -13% | -$107K |
|
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.