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 | |
|---|---|---|---|---|---|---|
1151
CALL
Revolution Medicines
RVMD
$40.2B
| $4.76M | ﹤0.01% |
48,900
+34,200
| +233% | +$3.45M |
|
1152
CALL
Celcuity
CELC
$4.03B
| $4.75M | ﹤0.01% |
41,600
-400
| -1% | -$43.6K |
|
1153
CALL
eBay
EBAY
$48.6B
| $4.74M | ﹤0.01% |
52,100
-139,400
| -73% | -$12.5M |
|
1154
PUT
Stryker
SYK
$127B
| $4.73M | ﹤0.01% |
14,400
+6,500
| +82% | +$2.33M |
|
1155
CALL
Southern Copper
SCCO
$141B
| $4.73M | ﹤0.01% |
27,775
+2,005
| +8% | +$367K |
|
1156
Spotify
SPOT
$99.2B
| $4.73M | ﹤0.01% |
9,748
-4,232
| -30% | -$2.12M |
|
|
ACLX
1157
CALL
DELISTED
Arcellx
ACLX
| $4.72M | ﹤0.01% |
41,100
+41,000
| +41,000% | +$3.62M |
|
1158
CALL
Bio-Rad Laboratories Class A
BIO
$8.42B
| $4.71M | ﹤0.01% |
16,900
+5,400
| +47% | +$1.56M |
|
1159
PUT
NXP Semiconductors
NXPI
$68B
| $4.7M | ﹤0.01% |
23,900
-6,500
| -21% | -$1.44M |
|
1160
CALL
The RealReal
REAL
$1.34B
| $4.67M | ﹤0.01% |
514,100
+345,400
| +205% | +$4.37M |
|
1161
AST SpaceMobile
ASTS
$16.8B
| $4.66M | ﹤0.01% |
56,256
-366,594
| -87% | -$34.6M |
|
1162
Thermo Fisher Scientific
TMO
$211B
| $4.66M | ﹤0.01% |
+9,480
| New | +$5.14M |
|
1163
CALL
YieldMax TSLA Option Income Strategy ETF
TSLY
$613M
| $4.66M | ﹤0.01% |
199,300
-139,200
| -41% | -$4.67M |
|
1164
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $4.64M | ﹤0.01% |
156,287
-262,331
| -63% | -$8.7M |
|
1165
The Mosaic Company
MOS
$7.09B
| $4.64M | ﹤0.01% |
+181,811
| New | +$4.99M |
|
|
PRMB
1166
Primo Brands
PRMB
$8.24B
| $4.63M | ﹤0.01% |
246,087
-44,423
| -15% | -$858K |
|
1167
PUT
Bank of Montreal
BMO
$125B
| $4.63M | ﹤0.01% |
34,200
+26,500
| +344% | +$3.68M |
|
1168
CALL
Trump Media & Technology Group
DJT
$2.37B
| $4.61M | ﹤0.01% |
+497,300
| New | +$5.71M |
|
1169
PUT
Royal Bank of Canada
RY
$291B
| $4.61M | ﹤0.01% |
28,500
+16,300
| +134% | +$2.73M |
|
1170
CALL
monday.com
MNDY
$3.27B
| $4.6M | ﹤0.01% |
66,500
+39,700
| +148% | +$3.81M |
|
1171
PUT
Stellantis
STLA
$16.5B
| $4.59M | ﹤0.01% |
646,700
-181,400
| -22% | -$1.52M |
|
1172
CALL
Novartis
NVS
$295B
| $4.57M | ﹤0.01% |
29,900
-17,000
| -36% | -$2.61M |
|
1173
CALL
Penumbra
PEN
$12.5B
| $4.56M | ﹤0.01% |
+13,900
| New | +$4.71M |
|
|
PRMB
1174
PUT
Primo Brands
PRMB
$8.24B
| $4.53M | ﹤0.01% |
240,800
+6,400
| +3% | +$124K |
|
|
ACLX
1175
PUT
DELISTED
Arcellx
ACLX
| $4.52M | ﹤0.01% |
39,400
-4,400
| -10% | -$388K |
|
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.