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 | |
|---|---|---|---|---|---|---|
976
PUT
Amprius Technologies
AMPX
$1.31B
| $6.11M | ﹤0.01% |
362,100
+299,600
| +479% | +$3.91M |
|
977
CALL
JetBlue
JBLU
$1.96B
| $6.09M | ﹤0.01% |
1,377,700
+503,100
| +58% | +$2.55M |
|
978
PUT
Sharplink Inc
SBET
$1.22B
| $6.09M | ﹤0.01% |
943,800
-148,300
| -14% | -$1.2M |
|
979
Cameco
CCJ
$38.3B
| $6.07M | ﹤0.01% |
55,851
+7,759
| +16% | +$888K |
|
980
PUT
Expedia Group
EXPE
$31.2B
| $6.05M | ﹤0.01% |
26,200
-35,900
| -58% | -$8.82M |
|
981
CALL
Dutch Bros
BROS
$8.78B
| $6.05M | ﹤0.01% |
119,400
+42,700
| +56% | +$2.34M |
|
982
PUT
Teradyne
TER
$54.8B
| $6.05M | ﹤0.01% |
20,400
-57,900
| -74% | -$16.1M |
|
983
Okta
OKTA
$24.1B
| $6.05M | ﹤0.01% |
76,826
+47,566
| +163% | +$3.95M |
|
984
CALL
AXT Inc
AXTI
$3.09B
| $6.05M | ﹤0.01% |
106,100
+86,700
| +447% | +$2.87M |
|
985
CALL
Plug Power
PLUG
$2.92B
| $6.05M | ﹤0.01% |
2,675,000
-1,761,300
| -40% | -$3.82M |
|
986
PUT
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$162M
| $6.03M | ﹤0.01% |
167,600
+69,300
| +70% | +$2.06M |
|
987
PUT
Alnylam Pharmaceuticals
ALNY
$36.3B
| $6.02M | ﹤0.01% |
18,200
+3,300
| +22% | +$1.12M |
|
988
PUT
ON Semiconductor
ON
$33.8B
| $6.02M | ﹤0.01% |
97,200
-201,700
| -67% | -$12.7M |
|
989
CALL
Global Payments
GPN
$22.1B
| $6.01M | ﹤0.01% |
89,300
-30,500
| -25% | -$2.25M |
|
990
CALL
Cummins
CMI
$91.7B
| $5.97M | ﹤0.01% |
11,100
+2,000
| +22% | +$1.13M |
|
991
CALL
Golar LNG
GLNG
$4.95B
| $5.97M | ﹤0.01% |
110,300
-163,700
| -60% | -$7.22M |
|
992
PUT
Equinor
EQNR
$95.9B
| $5.97M | ﹤0.01% |
141,400
+80,600
| +133% | +$2.43M |
|
993
CALL
CME Group
CME
$92.2B
| $5.97M | ﹤0.01% |
20,200
-9,700
| -32% | -$2.88M |
|
994
PUT
Camtek
CAMT
$6.9B
| $5.96M | ﹤0.01% |
39,300
+36,400
| +1,255% | +$5.52M |
|
995
CALL
Maplebear
CART
$9.92B
| $5.94M | ﹤0.01% |
158,500
-66,000
| -29% | -$2.5M |
|
996
PUT
Northrop Grumman
NOC
$77B
| $5.94M | ﹤0.01% |
8,700
-3,600
| -29% | -$2.49M |
|
997
PUT
Arthur J. Gallagher & Co
AJG
$63.7B
| $5.93M | ﹤0.01% |
27,400
-11,000
| -29% | -$2.54M |
|
998
CALL
Sarepta Therapeutics
SRPT
$1.66B
| $5.93M | ﹤0.01% |
272,700
-335,300
| -55% | -$6.49M |
|
999
CALL
NexGen Energy
NXE
$6.05B
| $5.92M | ﹤0.01% |
510,400
-486,900
| -49% | -$5.81M |
|
1000
PUT
Atlassian
TEAM
$22B
| $5.91M | ﹤0.01% |
86,600
-23,900
| -22% | -$2.36M |
|
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.