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 | |
|---|---|---|---|---|---|---|
926
CALL
Cadence Design Systems
CDNS
$91.1B
| $8.81M | 0.01% |
28,200
-18,500
| -40% | -$6.04M |
|
927
PUT
Ferrari
RACE
$63.2B
| $8.8M | 0.01% |
23,800
+2,900
| +14% | +$1.16M |
|
928
CALL
Bitdeer Technologies
BTDR
$2.96B
| $8.8M | 0.01% |
784,600
+169,400
| +28% | +$2.73M |
|
929
CALL
Hershey
HSY
$34.9B
| $8.79M | 0.01% |
48,300
+2,300
| +5% | +$420K |
|
930
PUT
Hecla Mining
HL
$10.3B
| $8.78M | ﹤0.01% |
457,300
-278,800
| -38% | -$4.26M |
|
931
CALL
HP
HPQ
$22.4B
| $8.74M | ﹤0.01% |
392,500
-156,100
| -28% | -$3.98M |
|
|
CFLT
932
PUT
DELISTED
Confluent
CFLT
| $8.74M | ﹤0.01% |
289,100
-104,700
| -27% | -$2.57M |
|
933
CALL
Plug Power
PLUG
$3.06B
| $8.74M | ﹤0.01% |
4,436,300
+48,600
| +1% | +$127K |
|
934
PUT
FirstEnergy
FE
$28.6B
| $8.68M | ﹤0.01% |
193,900
+25,700
| +15% | +$1.18M |
|
935
PUT
AB InBev
BUD
$155B
| $8.66M | ﹤0.01% |
135,300
-30,600
| -18% | -$1.9M |
|
936
BJs Wholesale Club
BJ
$11.7B
| $8.66M | ﹤0.01% |
96,184
+40,723
| +73% | +$3.74M |
|
937
PUT
Vanguard Consumer Discretionary ETF
VCR
$5.81B
| $8.65M | ﹤0.01% |
11,600
-300
| -3% | -$117K |
|
938
Zoetis
ZTS
$31.3B
| $8.63M | ﹤0.01% |
68,580
+59,251
| +635% | +$7.73M |
|
939
Futu Holdings
FUTU
$13.9B
| $8.63M | ﹤0.01% |
52,535
+8,683
| +20% | +$1.49M |
|
940
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$152B
| $8.62M | ﹤0.01% |
116,100
+32,900
| +40% | +$2.21M |
|
|
PSKY
941
CALL
Paramount Skydance Corp
PSKY
$9.5B
| $8.6M | ﹤0.01% |
641,800
-208,000
| -24% | -$3.25M |
|
942
CALL
Pagaya Technologies
PGY
$1.35B
| $8.59M | ﹤0.01% |
411,600
+272,600
| +196% | +$6.94M |
|
|
CTRA
943
CALL
DELISTED
Coterra Energy
CTRA
| $8.55M | ﹤0.01% |
324,900
+63,000
| +24% | +$1.59M |
|
944
PUT
Amplify Online Retail ETF
IBUY
$106M
| $8.54M | ﹤0.01% |
307,300
+146,800
| +91% | +$10.9M |
|
945
CALL
Teucrium Corn Fund
CORN
$190M
| $8.51M | ﹤0.01% |
+429,200
| New | +$7.62M |
|
946
CALL
Fastenal
FAST
$53B
| $8.51M | ﹤0.01% |
212,000
+133,600
| +170% | +$5.62M |
|
947
PUT
Canadian Natural Resources
CNQ
$98B
| $8.48M | ﹤0.01% |
250,500
+29,100
| +13% | +$944K |
|
948
PUT
GitLab
GTLB
$5.1B
| $8.45M | ﹤0.01% |
225,200
-4,000
| -2% | -$173K |
|
949
CALL
American Conservative Values ETF
ACVF
$149M
| $8.45M | ﹤0.01% |
881,700
-628,100
| -42% | -$30.9M |
|
950
PUT
Bunge Global
BG
$23.7B
| $8.44M | ﹤0.01% |
94,800
-14,600
| -13% | -$1.35M |
|
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.