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 | |
|---|---|---|---|---|---|---|
6976
CALL
Invesco Mortgage Capital
IVR
$809M
| $15.4K | ﹤0.01% |
+1,900
| New | +$16.2K |
|
6977
Lineage Cell Therapeutics
LCTX
$274M
| $15.3K | ﹤0.01% |
+9,698
| New | +$16.4K |
|
6978
Build-A-Bear
BBW
$427M
| $15.3K | ﹤0.01% |
409
-886
| -68% | -$46.7K |
|
6979
PUT
Aemetis
AMTX
$103M
| $15.3K | ﹤0.01% |
4,800
-12,500
| -72% | -$22.7K |
|
6980
CALL
Willdan Group
WLDN
$1.1B
| $15.3K | ﹤0.01% |
200
-6,600
| -97% | -$698K |
|
6981
CALL
America Movil
AMX
$78.3B
| $15.3K | ﹤0.01% |
600
-1,600
| -73% | -$36.5K |
|
6982
Watsco Inc
WSO
$15.3B
| $15.3K | ﹤0.01% |
42
-729
| -95% | -$282K |
|
6983
John Wiley & Sons Class A
WLY
$2.58B
| $15.3K | ﹤0.01% |
+401
| New | +$13K |
|
6984
Byrna Technologies
BYRN
$72.2M
| $15.2K | ﹤0.01% |
+1,661
| New | +$21.8K |
|
6985
Amplify Cybersecurity ETF
HACK
$2.7B
| $15.2K | ﹤0.01% |
203
-332
| -62% | -$25.6K |
|
6986
ProShares Ultra Technology
ROM
$1.2B
| $15.2K | ﹤0.01% |
+194
| New | +$17.3K |
|
|
ONTF
6987
DELISTED
ON24
ONTF
| $15.2K | ﹤0.01% |
+1,875
| New | +$15K |
|
6988
Waterstone Financial
WSBF
$355M
| $15.2K | ﹤0.01% |
842
-1,464
| -63% | -$26K |
|
6989
Boise Cascade
BCC
$2.67B
| $15.2K | ﹤0.01% |
200
-297
| -60% | -$23.8K |
|
6990
CALL
Third Coast Bancshares
TCBX
$664M
| $15.1K | ﹤0.01% |
+400
| New | +$15.8K |
|
6991
PUT
LifeVantage
LFVN
$79M
| $15.1K | ﹤0.01% |
3,500
-100
| -3% | -$524 |
|
6992
CALL
DXC Technology
DXC
$1.51B
| $15.1K | ﹤0.01% |
1,200
+200
| +20% | +$2.69K |
|
6993
PUT
FNB Corp
FNB
$6.67B
| $15K | ﹤0.01% |
900
-100
| -10% | -$1.73K |
|
6994
CALL
Zai Lab
ZLAB
$2.32B
| $15K | ﹤0.01% |
800
-6,300
| -89% | -$117K |
|
6995
PUT
NMI Holdings
NMIH
$3.24B
| $15K | ﹤0.01% |
400
+300
| +300% | +$11.6K |
|
6996
VanEck ChiNext Innovators ETF
CNXT
$115M
| $15K | ﹤0.01% |
329
-232
| -41% | -$10.6K |
|
|
MBX
6997
CALL
MBX Biosciences
MBX
$2.87B
| $14.9K | ﹤0.01% |
500
-4,800
| -91% | -$163K |
|
6998
CALL
Horizon Bancorp
HBNC
$1.05B
| $14.9K | ﹤0.01% |
900
| – | – |
|
6999
Academy Sports + Outdoors
ASO
$2.97B
| $14.9K | ﹤0.01% |
+264
| New | +$15K |
|
7000
PUT
NatWest
NWG
$72.1B
| $14.9K | ﹤0.01% |
+1,000
| New | +$16.6K |
|
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.