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 | |
|---|---|---|---|---|---|---|
4926
EverQuote
EVER
$890M
| $108K | ﹤0.01% |
3,991
+2,069
| +108% | +$50.1K |
|
4927
CALL
Genesis Energy
GEL
$1.88B
| $108K | ﹤0.01% |
6,900
-50,600
| -88% | -$794K |
|
4928
TC Energy
TRP
$70.3B
| $107K | ﹤0.01% |
+1,951
| New | +$104K |
|
4929
Fortuna Silver Mines
FSM
$2.54B
| $107K | ﹤0.01% |
+10,934
| New | +$98.4K |
|
4930
PUT
Nuvectis Pharma
NVCT
$677M
| $107K | ﹤0.01% |
+14,200
| New | +$92.6K |
|
|
ODVWW
4931
CALL
DELISTED
Osisko Development Corp. Warrant
ODVWW
| $107K | ﹤0.01% |
30,700
-84,900
| -73% | -$296K |
|
4932
PUT
Sonos
SONO
$1.73B
| $107K | ﹤0.01% |
6,100
-36,200
| -86% | -$631K |
|
4933
IMAX
IMAX
$2.63B
| $107K | ﹤0.01% |
+2,891
| New | +$101K |
|
4934
Arbutus Biopharma
ABUS
$855M
| $107K | ﹤0.01% |
22,203
-18,760
| -46% | -$84.4K |
|
|
QVCGA
4935
CALL
DELISTED
QVC Group Inc Series A
QVCGA
| $107K | ﹤0.01% |
10,200
-5,700
| -36% | -$62K |
|
4936
PUT
CACI
CACI
$11B
| $107K | ﹤0.01% |
200
-800
| -80% | -$452K |
|
4937
YieldMax AMD Option Income Strategy ETF
AMDY
$385M
| $106K | ﹤0.01% |
2,797
-178
| -6% | -$7.77K |
|
4938
Cabot Corp
CBT
$4.56B
| $106K | ﹤0.01% |
1,601
+341
| +27% | +$22.7K |
|
4939
Scotiabank
BNS
$107B
| $106K | ﹤0.01% |
1,439
-32,485
| -96% | -$2.21M |
|
4940
PUT
Republic Services
RSG
$64.9B
| $106K | ﹤0.01% |
500
-15,900
| -97% | -$3.42M |
|
4941
CALL
Revolve Group
RVLV
$1.81B
| $106K | ﹤0.01% |
3,500
+200
| +6% | +$4.83K |
|
4942
CALL
US Foods
USFD
$22.1B
| $105K | ﹤0.01% |
1,400
-14,000
| -91% | -$1.05M |
|
4943
CALL
Holley
HLLY
$324M
| $105K | ﹤0.01% |
25,500
| – | – |
|
4944
PUT
MGIC Investment
MTG
$6.16B
| $105K | ﹤0.01% |
3,600
+3,500
| +3,500% | +$98.3K |
|
4945
PUT
Ecolab
ECL
$78.3B
| $105K | ﹤0.01% |
400
-200
| -33% | -$53.3K |
|
4946
PUT
Annexon
ANNX
$826M
| $105K | ﹤0.01% |
20,900
+20,500
| +5,125% | +$78.4K |
|
4947
Wrap Technologies
WRAP
$101M
| $105K | ﹤0.01% |
44,047
-15,830
| -26% | -$38.2K |
|
4948
PUT
Sprout Social
SPT
$516M
| $105K | ﹤0.01% |
9,300
+6,500
| +232% | +$70.2K |
|
4949
Atmos Energy
ATO
$28.9B
| $105K | ﹤0.01% |
+624
| New | +$108K |
|
4950
PUT
B&G Foods
BGS
$287M
| $104K | ﹤0.01% |
24,300
-119,900
| -83% | -$536K |
|
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.