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 | |
|---|---|---|---|---|---|---|
751
Zoetis
ZTS
$31.6B
| $8.83M | 0.01% |
74,697
+6,117
| +9% | +$756K |
|
|
HUT
752
PUT
Hut 8
HUT
$12.6B
| $8.82M | 0.01% |
188,000
-360,400
| -66% | -$19.5M |
|
753
CALL
Cytokinetics
CYTK
$11B
| $8.79M | 0.01% |
133,300
+24,200
| +22% | +$1.54M |
|
754
CALL
Alamos Gold
AGI
$12.4B
| $8.78M | 0.01% |
197,600
-55,100
| -22% | -$2.43M |
|
755
PUT
Abbott
ABT
$180B
| $8.76M | 0.01% |
85,300
-105,300
| -55% | -$11.9M |
|
756
CALL
Illinois Tool Works
ITW
$81.2B
| $8.75M | 0.01% |
33,600
+27,900
| +489% | +$7.59M |
|
757
PUT
Affirm
AFRM
$23.7B
| $8.74M | 0.01% |
190,800
-305,100
| -62% | -$17.6M |
|
758
PUT
GSK
GSK
$103B
| $8.7M | 0.01% |
157,600
-106,400
| -40% | -$5.77M |
|
759
PUT
iShares Gold Trust
IAU
$63B
| $8.68M | 0.01% |
98,500
-404,400
| -80% | -$37.1M |
|
760
CALL
Union Pacific
UNP
$182B
| $8.66M | 0.01% |
35,700
-96,000
| -73% | -$23.5M |
|
761
PUT
AeroVironment
AVAV
$7.65B
| $8.66M | 0.01% |
47,300
+19,800
| +72% | +$5.22M |
|
762
CALL
Medtronic
MDT
$106B
| $8.66M | 0.01% |
99,900
-103,100
| -51% | -$9.88M |
|
763
CALL
CarMax
KMX
$8.32B
| $8.65M | 0.01% |
208,000
-57,900
| -22% | -$2.53M |
|
764
PUT
Estee Lauder
EL
$29B
| $8.63M | 0.01% |
120,200
-59,100
| -33% | -$6.04M |
|
765
PUT
Workday
WDAY
$33.3B
| $8.63M | 0.01% |
66,400
+28,300
| +74% | +$4.49M |
|
766
CALL
Celsius Holdings
CELH
$6.88B
| $8.6M | 0.01% |
242,500
-403,400
| -62% | -$19.1M |
|
767
CALL
Duke Energy
DUK
$101B
| $8.59M | 0.01% |
65,600
-136,900
| -68% | -$17.1M |
|
768
PUT
Snap
SNAP
$7.4B
| $8.58M | 0.01% |
1,866,300
-551,400
| -23% | -$3.25M |
|
769
PUT
Sable Offshore Corp
SOC
$911M
| $8.58M | 0.01% |
519,200
-584,000
| -53% | -$6.82M |
|
770
CALL
Interactive Brokers
IBKR
$40.8B
| $8.56M | 0.01% |
+127,700
| New | +$9.11M |
|
771
CALL
Opendoor
OPEN
$3.78B
| $8.51M | 0.01% |
2,765,200
-3,148,200
| -53% | -$17M |
|
|
FLG
772
CALL
Flagstar Bank National Association
FLG
$5.78B
| $8.5M | 0.01% |
+645,600
| New | +$8.46M |
|
773
PUT
Dollar General
DG
$25.8B
| $8.5M | 0.01% |
71,600
-116,400
| -62% | -$16.6M |
|
774
PUT
Ferrari
RACE
$63.4B
| $8.5M | 0.01% |
25,100
+1,300
| +5% | +$455K |
|
775
CALL
Generac Holdings
GNRC
$11.9B
| $8.48M | 0.01% |
43,400
-8,900
| -17% | -$1.71M |
|
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.