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 | |
|---|---|---|---|---|---|---|
|
SRG
3726
PUT
Seritage Growth Properties
SRG
$136M
| $327K | ﹤0.01% |
116,500
+115,500
| +11,550% | +$361K |
|
3727
Navios Maritime Partners
NMM
$2.3B
| $327K | ﹤0.01% |
+4,845
| New | +$302K |
|
3728
PUT
Newmark Group
NMRK
$2.66B
| $327K | ﹤0.01% |
+21,800
| New | +$344K |
|
3729
Direxion Daily S&P 500 Bull 2X ETF
SPUU
$253M
| $326K | ﹤0.01% |
+1,974
| New | +$359K |
|
3730
CALL
Contango Silver & Gold Inc
CTGO
$516M
| $326K | ﹤0.01% |
17,400
-3,900
| -18% | -$103K |
|
3731
PUT
OGE Energy
OGE
$9.78B
| $326K | ﹤0.01% |
6,800
+1,700
| +33% | +$77.8K |
|
3732
PUT
West Pharmaceutical
WST
$24B
| $326K | ﹤0.01% |
+1,300
| New | +$323K |
|
3733
Gildan
GIL
$10.3B
| $326K | ﹤0.01% |
+5,850
| New | +$378K |
|
3734
CALL
Ternium
TX
$9.67B
| $325K | ﹤0.01% |
8,100
-16,100
| -67% | -$667K |
|
3735
CALL
Ultragenyx Pharmaceutical
RARE
$2.45B
| $325K | ﹤0.01% |
+15,500
| New | +$349K |
|
3736
Alcon
ALC
$33.6B
| $325K | ﹤0.01% |
4,308
+598
| +16% | +$47.7K |
|
3737
YieldMax Ultra Option Income Strategy ETF
ULTY
$762M
| $324K | ﹤0.01% |
10,569
-21,725
| -67% | -$755K |
|
3738
PUT
LGI Homes
LGIH
$1.27B
| $324K | ﹤0.01% |
8,200
+5,800
| +242% | +$283K |
|
|
DX
3739
PUT
Dynex Capital
DX
$3.15B
| $324K | ﹤0.01% |
25,400
-104,800
| -80% | -$1.44M |
|
|
BRR
3740
CALL
ProCap Financial Inc
BRR
$154M
| $324K | ﹤0.01% |
153,600
+74,300
| +94% | +$206K |
|
|
UCTT
3741
Ultra Clean Holdings
UCTT
$3.73B
| $324K | ﹤0.01% |
5,210
+5,144
| +7,794% | +$264K |
|
3742
Ezcorp Inc
EZPW
$1.83B
| $324K | ﹤0.01% |
12,760
-1,156
| -8% | -$27.7K |
|
3743
PUT
Precigen
PGEN
$2.24B
| $324K | ﹤0.01% |
83,600
+62,100
| +289% | +$255K |
|
3744
Gates Industrial Corporation Ltd.
GTES
$7.08B
| $323K | ﹤0.01% |
14,295
+13,548
| +1,814% | +$329K |
|
3745
CALL
Domino's
DPZ
$11.5B
| $323K | ﹤0.01% |
900
-6,500
| -88% | -$2.57M |
|
3746
PUT
James Hardie Industries
JHX
$15.3B
| $322K | ﹤0.01% |
17,000
+10,500
| +162% | +$236K |
|
3747
CALL
Magnite
MGNI
$2.76B
| $322K | ﹤0.01% |
27,100
-250,000
| -90% | -$3.35M |
|
3748
PUT
Vericel Corp
VCEL
$2.35B
| $322K | ﹤0.01% |
10,000
| – | – |
|
3749
Fulcrum Therapeutics
FULC
$273M
| $322K | ﹤0.01% |
41,940
+33,926
| +423% | +$315K |
|
3750
CALL
Inspired Entertainment
INSE
$184M
| $322K | ﹤0.01% |
45,100
-1,800
| -4% | -$14.8K |
|
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.