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 | |
|---|---|---|---|---|---|---|
7001
PUT
DiaMedica Therapeutics
DMAC
$378M
| $14.9K | ﹤0.01% |
2,200
+700
| +47% | +$5.55K |
|
7002
CALL
Bain Capital Specialty
BCSF
$821M
| $14.9K | ﹤0.01% |
1,200
-9,900
| -89% | -$130K |
|
7003
VanEck Fallen Angel High Yield Bond ETF
ANGL
$3.09B
| $14.9K | ﹤0.01% |
518
+473
| +1,051% | +$13.9K |
|
7004
PUT
BayCom
BCML
$370M
| $14.9K | ﹤0.01% |
+500
| New | +$14.7K |
|
|
GOOD
7005
PUT
Gladstone Commercial Corp
GOOD
$631M
| $14.9K | ﹤0.01% |
1,300
-2,100
| -62% | -$24.6K |
|
7006
Zumiez
ZUMZ
$320M
| $14.8K | ﹤0.01% |
670
+285
| +74% | +$6.95K |
|
7007
PUT
Leggett & Platt
LEG
$1.46B
| $14.8K | ﹤0.01% |
1,500
-219,900
| -99% | -$2.51M |
|
7008
California Water Service
CWT
$3.08B
| $14.8K | ﹤0.01% |
+326
| New | +$14.6K |
|
7009
Editas Medicine
EDIT
$442M
| $14.8K | ﹤0.01% |
5,981
-133,791
| -96% | -$283K |
|
7010
PUT
Star Group
SGU
$427M
| $14.7K | ﹤0.01% |
+1,200
| New | +$15.2K |
|
7011
Akebia Therapeutics
AKBA
$349M
| $14.7K | ﹤0.01% |
10,589
-10,306
| -49% | -$14.2K |
|
7012
CALL
Korro Bio
KRRO
$166M
| $14.7K | ﹤0.01% |
1,300
| – | – |
|
|
BLCN
7013
CALL
DELISTED
Siren ETF Trust Siren NexGen Economy ETF
BLCN
| $14.7K | ﹤0.01% |
700
-2,500
| -78% | -$58K |
|
7014
OneSpan
OSPN
$575M
| $14.7K | ﹤0.01% |
1,394
-2,168
| -61% | -$24.6K |
|
7015
First American
FAF
$7.3B
| $14.7K | ﹤0.01% |
243
+198
| +440% | +$12.7K |
|
|
FPS
7016
PUT
Forgent Power Solutions
FPS
$10.5B
| $14.6K | ﹤0.01% |
+500
| New | +$16.6K |
|
|
SRTA
7017
PUT
Strata Critical Medical Inc
SRTA
$446M
| $14.6K | ﹤0.01% |
3,500
+400
| +13% | +$1.93K |
|
|
GDEN
7018
DELISTED
Golden Entertainment
GDEN
| $14.6K | ﹤0.01% |
548
-511
| -48% | -$14.2K |
|
7019
CALL
RXO
RXO
$4.76B
| $14.6K | ﹤0.01% |
1,000
-800
| -44% | -$11.7K |
|
7020
Capital Group Dividend Value ETF
CGDV
$36.7B
| $14.6K | ﹤0.01% |
+343
| New | +$15.2K |
|
7021
PUT
Arqit Quantum
ARQQ
$299M
| $14.6K | ﹤0.01% |
1,100
-100
| -8% | -$1.88K |
|
7022
PUT
Grupo Cibest SA
CIB
$19.2B
| $14.6K | ﹤0.01% |
200
-4,500
| -96% | -$331K |
|
7023
iShares Core S&P Small-Cap ETF
IJR
$110B
| $14.5K | ﹤0.01% |
+117
| New | +$14.9K |
|
7024
NBT Bancorp
NBTB
$2.72B
| $14.5K | ﹤0.01% |
+341
| New | +$14.8K |
|
7025
PUT
Scansource
SCSC
$1.1B
| $14.5K | ﹤0.01% |
+400
| New | +$15.3K |
|
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.