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 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
JOYY
3751
PUT
JOYY Inc
JOYY
$3.93B
| $321K | ﹤0.01% |
5,500
+1,400
| +34% | +$88.5K |
|
3752
Indivior Pharmaceuticals
INDV
$4.18B
| $321K | ﹤0.01% |
10,533
+448
| +4% | +$14.8K |
|
3753
ProShares UltraShort Silver
ZSL
$74.3M
| $321K | ﹤0.01% |
14,257
+1,968
| +16% | +$49.5K |
|
3754
CALL
Privia Health
PRVA
$2.56B
| $321K | ﹤0.01% |
15,600
+14,700
| +1,633% | +$331K |
|
3755
PUT
Landstar System
LSTR
$5.77B
| $321K | ﹤0.01% |
2,000
+600
| +43% | +$92.1K |
|
|
WCN
3756
Waste Connections
WCN
$37.9B
| $320K | ﹤0.01% |
+1,971
| New | +$329K |
|
|
TUZ
3757
PUT
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $320K | ﹤0.01% |
5,000
+500
| +11% | +$32K |
|
3758
CALL
Select Water Solutions
WTTR
$2.58B
| $320K | ﹤0.01% |
20,900
+18,300
| +704% | +$239K |
|
|
ALMS
3759
CALL
Alumis Inc
ALMS
$933M
| $319K | ﹤0.01% |
14,500
-25,100
| -63% | -$627K |
|
3760
Birkenstock
BIRK
$5.44B
| $319K | ﹤0.01% |
8,910
-39,536
| -82% | -$1.54M |
|
3761
Global X MSCI Argentina ETF
ARGT
$706M
| $319K | ﹤0.01% |
3,420
-2,061
| -38% | -$190K |
|
3762
CALL
Rigel Pharmaceuticals
RIGL
$877M
| $319K | ﹤0.01% |
11,800
+7,500
| +174% | +$252K |
|
3763
CALL
Corporacion America
CAAP
$3.97B
| $319K | ﹤0.01% |
12,600
+8,600
| +215% | +$234K |
|
3764
Peapack-Gladstone Financial
PGC
$781M
| $319K | ﹤0.01% |
+9,050
| New | +$294K |
|
3765
PUT
New Fortress Energy
NFE
$33.8M
| $318K | ﹤0.01% |
10,786
-6,570
| -38% | -$384K |
|
|
ABVX
3766
Abivax
ABVX
$8.3B
| $317K | ﹤0.01% |
2,850
+1,615
| +131% | +$191K |
|
3767
PUT
NiSource
NI
$18.9B
| $317K | ﹤0.01% |
6,800
+6,100
| +871% | +$275K |
|
3768
DexCom
DXCM
$32.5B
| $317K | ﹤0.01% |
+5,052
| New | +$352K |
|
|
NNDM
3769
CALL
Nano Dimension
NNDM
$342M
| $317K | ﹤0.01% |
186,600
-6,900
| -4% | -$12.6K |
|
3770
CALL
LKQ Corp
LKQ
$5.76B
| $317K | ﹤0.01% |
10,800
-49,800
| -82% | -$1.6M |
|
3771
CALL
Jackson Financial
JXN
$8.77B
| $317K | ﹤0.01% |
3,000
+800
| +36% | +$89.5K |
|
3772
Clearwater Paper
CLW
$314M
| $317K | ﹤0.01% |
22,052
+15,246
| +224% | +$248K |
|
3773
CALL
Zimmer Biomet
ZBH
$16.8B
| $316K | ﹤0.01% |
3,500
+1,400
| +67% | +$128K |
|
3774
PUT
Mistras Group
MG
$657M
| $316K | ﹤0.01% |
21,400
+10,700
| +100% | +$154K |
|
3775
PUT
Veeva Systems
VEEV
$45.6B
| $316K | ﹤0.01% |
1,800
-15,000
| -89% | -$2.95M |
|
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's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- 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 2,157 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.