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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4851
PUT
Incyte
INCY
$23.5B
| $122K | ﹤0.01% |
1,300
-36,700
| -97% | -$3.66M |
|
4852
PUT
Janux Therapeutics
JANX
$935M
| $122K | ﹤0.01% |
8,800
-20,800
| -70% | -$285K |
|
4853
PUT
FuelCell Energy
FCEL
$1.7B
| $122K | ﹤0.01% |
18,700
-88,900
| -83% | -$686K |
|
4854
Direxion Daily S&P Oil & Gas Exp. & Prod. Bear 2X ETF
DRIP
$103M
| $122K | ﹤0.01% |
+2,947
| New | +$191K |
|
4855
CALL
Gran Tierra Energy
GTE
$260M
| $122K | ﹤0.01% |
+13,600
| New | +$86.2K |
|
4856
PUT
Badger Meter
BMI
$3.66B
| $122K | ﹤0.01% |
800
+700
| +700% | +$110K |
|
4857
PUT
EnerSys
ENS
$6.95B
| $122K | ﹤0.01% |
700
-100
| -13% | -$16.9K |
|
|
ACH
4858
CALL
Accendra Health
ACH
$240M
| $122K | ﹤0.01% |
53,300
+43,500
| +444% | +$100K |
|
4859
Cogent Biosciences
COGT
$6.79B
| $121K | ﹤0.01% |
+3,153
| New | +$116K |
|
|
ATYR
4860
CALL
aTyr Pharma
ATYR
$46.4M
| $121K | ﹤0.01% |
155,500
-7,800
| -5% | -$6.58K |
|
4861
PUT
Yelp
YELP
$1.38B
| $121K | ﹤0.01% |
4,900
+4,200
| +600% | +$106K |
|
4862
PUT
Legend Biotech
LEGN
$4.3B
| $121K | ﹤0.01% |
6,700
-30,100
| -82% | -$574K |
|
4863
Americold
COLD
$4.09B
| $121K | ﹤0.01% |
10,571
-5,798
| -35% | -$72.7K |
|
4864
Sixth Street Specialty
TSLX
$1.59B
| $121K | ﹤0.01% |
+6,590
| New | +$130K |
|
4865
CALL
Lear
LEA
$7.19B
| $121K | ﹤0.01% |
1,000
-900
| -47% | -$112K |
|
4866
PUT
CenterPoint Energy
CNP
$29.1B
| $121K | ﹤0.01% |
2,800
-8,200
| -75% | -$338K |
|
|
ORKA
4867
Oruka Therapeutics
ORKA
$5.56B
| $121K | ﹤0.01% |
+2,463
| New | +$85.6K |
|
|
LENZ
4868
PUT
LENZ Therapeutics
LENZ
$172M
| $121K | ﹤0.01% |
13,200
+5,900
| +81% | +$82.9K |
|
4869
CALL
Charles River Laboratories
CRL
$10.9B
| $121K | ﹤0.01% |
700
-800
| -53% | -$148K |
|
4870
Super Micro Computer
SMCI
$19.5B
| $121K | ﹤0.01% |
+5,299
| New | +$159K |
|
4871
PUT
FTAI Infrastructure
FIP
$500M
| $121K | ﹤0.01% |
24,400
+14,900
| +157% | +$83.5K |
|
4872
CALL
Pricesmart
PSMT
$5.75B
| $120K | ﹤0.01% |
+800
| New | +$117K |
|
4873
CALL
Astronics
ATRO
$3.45B
| $120K | ﹤0.01% |
2,160
-120
| -5% | -$7.25K |
|
|
MESO
4874
PUT
Mesoblast
MESO
$1.99B
| $120K | ﹤0.01% |
7,800
+1,300
| +20% | +$21.6K |
|
4875
CALL
Valmont Industries
VMI
$9.44B
| $120K | ﹤0.01% |
+300
| New | +$131K |
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,156 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.