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 | |
|---|---|---|---|---|---|---|
3901
CALL
PagerDuty
PD
$822M
| $277K | ﹤0.01% |
21,100
-81,400
| -79% | -$1.19M |
|
3902
PUT
Indivior Pharmaceuticals
INDV
$4.84B
| $276K | ﹤0.01% |
7,700
-1,800
| -19% | -$55K |
|
3903
PUT
Banc of California
BANC
$2.97B
| $276K | ﹤0.01% |
15,000
-279,200
| -95% | -$5M |
|
3904
PUT
Enliven Therapeutics
ELVN
$3.75B
| $276K | ﹤0.01% |
+17,900
| New | +$357K |
|
3905
CALL
Group 1 Automotive
GPI
$4.35B
| $275K | ﹤0.01% |
700
-300
| -30% | -$123K |
|
3906
PUT
Utz Brands
UTZ
$1.25B
| $275K | ﹤0.01% |
26,500
-1,200
| -4% | -$12.9K |
|
3907
LifeMD
LFMD
$182M
| $275K | ﹤0.01% |
80,565
+40,186
| +100% | +$195K |
|
3908
CALL
Louisiana-Pacific
LPX
$5.19B
| $275K | ﹤0.01% |
3,400
-300
| -8% | -$25.3K |
|
3909
PUT
HDFC Bank
HDB
$123B
| $274K | ﹤0.01% |
7,900
-6,100
| -44% | -$219K |
|
3910
Vita Coco
COCO
$3.85B
| $274K | ﹤0.01% |
5,174
-10,560
| -67% | -$495K |
|
|
NAGE
3911
CALL
Niagen Bioscience
NAGE
$252M
| $274K | ﹤0.01% |
43,100
-3,900
| -8% | -$27.1K |
|
3912
Invesco DB Commodity Index Tracking Fund
DBC
$1.69B
| $274K | ﹤0.01% |
+12,246
| New | +$278K |
|
|
GEMI
3913
PUT
Gemini Space Station
GEMI
$515M
| $274K | ﹤0.01% |
27,600
-13,500
| -33% | -$211K |
|
3914
CALL
Kinsale Capital Group
KNSL
$8.55B
| $274K | ﹤0.01% |
700
+400
| +133% | +$163K |
|
|
HPP
3915
PUT
Hudson Pacific Properties
HPP
$785M
| $273K | ﹤0.01% |
25,200
+16,486
| +189% | +$245K |
|
|
GOLD
3916
Gold.com Inc
GOLD
$1.15B
| $272K | ﹤0.01% |
7,997
-19,914
| -71% | -$569K |
|
3917
CALL
Evercore
EVR
$11.8B
| $272K | ﹤0.01% |
800
+600
| +300% | +$193K |
|
3918
CALL
Piper Sandler
PIPR
$5.1B
| $272K | ﹤0.01% |
3,200
+2,800
| +700% | +$236K |
|
3919
PUT
Kimbell Royalty Partners
KRP
$1.45B
| $272K | ﹤0.01% |
23,100
+8,200
| +55% | +$105K |
|
3920
PUT
NextDecade
NEXT
$1.71B
| $271K | ﹤0.01% |
51,500
-58,300
| -53% | -$348K |
|
3921
Bunge Global
BG
$21.1B
| $271K | ﹤0.01% |
3,040
-15,175
| -83% | -$1.4M |
|
3922
CALL
Intapp
INTA
$2.43B
| $270K | ﹤0.01% |
5,900
-600
| -9% | -$24.9K |
|
3923
Ezcorp Inc
EZPW
$1.8B
| $270K | ﹤0.01% |
+13,916
| New | +$262K |
|
3924
CALL
Dakota Gold
DC
$607M
| $269K | ﹤0.01% |
+47,400
| New | +$228K |
|
|
WCC
3925
CALL
WESCO International
WCC
$15.5B
| $269K | ﹤0.01% |
1,100
| – | – |
|
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.