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 | Miscellaneous | 98.27% |
| 2 | Technology | 0.59% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.18% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1051
PUT
Ulta Beauty
ULTA
$24.1B
| $7.14M | ﹤0.01% |
11,800
-18,100
| -61% | -$9.95M |
|
1052
GraniteShares 2x Long AMD Daily ETF
AMDL
$921M
| $7.14M | ﹤0.01% |
459,058
-332,407
| -42% | -$6.02M |
|
1053
CALL
Generac Holdings
GNRC
$11.1B
| $7.13M | ﹤0.01% |
52,300
+16,800
| +47% | +$2.71M |
|
1054
eBay
EBAY
$46B
| $7.13M | ﹤0.01% |
81,860
+80,937
| +8,769% | +$7.01M |
|
1055
PUT
Sibanye-Stillwater
SBSW
$9.05B
| $7.11M | ﹤0.01% |
498,800
-107,100
| -18% | -$1.3M |
|
1056
PUT
Toronto Dominion Bank
TD
$199B
| $7.1M | ﹤0.01% |
75,400
-7,800
| -9% | -$659K |
|
1057
PUT
Marathon Petroleum
MPC
$109B
| $7.09M | ﹤0.01% |
43,600
-44,500
| -51% | -$8.32M |
|
1058
PUT
uniQure
QURE
$3.09B
| $7.08M | ﹤0.01% |
295,800
-90,200
| -23% | -$3.48M |
|
|
DENT
1059
CALL
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $7.08M | ﹤0.01% |
1,505,800
+80,100
| +6% | +$376K |
|
1060
CALL
ProShares Ether Strategy ETF
EETH
$68.2M
| $7.04M | ﹤0.01% |
214,200
-230,300
| -52% | -$11.5M |
|
1061
CALL
Hilton Worldwide
HLT
$70B
| $7.04M | ﹤0.01% |
24,500
-900
| -4% | -$245K |
|
1062
PUT
Northrop Grumman
NOC
$73.2B
| $7.01M | ﹤0.01% |
12,300
+1,600
| +15% | +$929K |
|
1063
Synopsys
SNPS
$75.5B
| $7.01M | ﹤0.01% |
+14,916
| New | +$6.63M |
|
1064
GE Vernova
GEV
$251B
| $7M | ﹤0.01% |
+10,711
| New | +$6.52M |
|
|
ARR
1065
PUT
Armour Residential REIT
ARR
$2.31B
| $6.99M | ﹤0.01% |
395,300
-38,400
| -9% | -$637K |
|
1066
CALL
Baker Hughes
BKR
$63B
| $6.97M | ﹤0.01% |
153,100
+28,900
| +23% | +$1.37M |
|
1067
Dow Inc
DOW
$21.3B
| $6.95M | ﹤0.01% |
297,320
-63,441
| -18% | -$1.46M |
|
1068
CALL
2x Long VIX Futures ETF
UVIX
$174M
| $6.95M | ﹤0.01% |
28,445
+11,870
| +72% | +$2.17M |
|
1069
PUT
Cardinal Health
CAH
$57.5B
| $6.95M | ﹤0.01% |
33,800
-9,700
| -22% | -$1.83M |
|
1070
CALL
Match Group
MTCH
$9.61B
| $6.94M | ﹤0.01% |
214,800
-17,100
| -7% | -$562K |
|
1071
CALL
Cytokinetics
CYTK
$10.1B
| $6.93M | ﹤0.01% |
109,100
-8,000
| -7% | -$498K |
|
1072
PUT
Travelers Companies
TRV
$77B
| $6.9M | ﹤0.01% |
23,800
-3,000
| -11% | -$844K |
|
1073
CALL
Abercrombie & Fitch
ANF
$6.65B
| $6.9M | ﹤0.01% |
54,800
-21,100
| -28% | -$1.84M |
|
|
TIGR
1074
PUT
UP Fintech Holding
TIGR
$914M
| $6.89M | ﹤0.01% |
720,800
-284,000
| -28% | -$2.71M |
|
1075
CALL
Advance Auto Parts
AAP
$2.67B
| $6.89M | ﹤0.01% |
175,200
+73,800
| +73% | +$3.7M |
|
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's Q4 2025 filing shows 1,476 new, 2,599 increased, 4,088 reduced and 2,184 closed positions. Its largest new stake was Western Digital: 341,762 shares worth $58.9M. The largest sale was NVIDIA, an estimated $262M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.