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 |
Netflix
NFLX
|
+$73.1M |
| 2 |
Western Digital
WDC
|
+$51.8M |
| 3 |
iShares Semiconductor ETF
SOXX
|
+$46M |
| 4 |
Meta Platforms (Facebook)
META
|
+$41.8M |
| 5 |
Alibaba
BABA
|
+$37.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$262M |
| 2 |
Microsoft
MSFT
|
+$194M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$149M |
| 4 |
Apple
AAPL
|
+$119M |
| 5 |
Amazon
AMZN
|
+$107M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.59% |
| 2 | Consumer Discretionary | 0.21% |
| 3 | Healthcare | 0.2% |
| 4 | Industrials | 0.18% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3726
CALL
HCI Group
HCI
$2.29B
| $326K | ﹤0.01% |
1,700
-9,700
| -85% | -$1.83M |
|
3727
Biohaven
BHVN
$2.07B
| $325K | ﹤0.01% |
28,812
-32,484
| -53% | -$402K |
|
|
DAY
3728
PUT
DELISTED
Dayforce
DAY
| $325K | ﹤0.01% |
4,700
-5,600
| -54% | -$385K |
|
|
LAND
3729
CALL
Gladstone Land Corp
LAND
$366M
| $325K | ﹤0.01% |
35,500
+18,900
| +114% | +$173K |
|
3730
Option Care Health
OPCH
$3.53B
| $325K | ﹤0.01% |
10,191
+1,049
| +11% | +$30.8K |
|
|
CIM
3731
CALL
Chimera Investment
CIM
$1.06B
| $324K | ﹤0.01% |
26,100
-3,100
| -11% | -$39.4K |
|
3732
CALL
Columbia Banking Systems
COLB
$8.84B
| $324K | ﹤0.01% |
11,600
+9,700
| +511% | +$263K |
|
3733
PUT
Talphera
TLPH
$67.5M
| $324K | ﹤0.01% |
+284,400
| New | +$343K |
|
3734
Rayonier
RYN
$6.64B
| $324K | ﹤0.01% |
14,955
-38,493
| -72% | -$870K |
|
3735
CALL
HEICO Corp Class A
HEI.A
$36.8B
| $324K | ﹤0.01% |
1,000
-500
| -33% | -$124K |
|
3736
CALL
Delek US
DK
$3.85B
| $323K | ﹤0.01% |
10,900
-119,400
| -92% | -$4.26M |
|
3737
PUT
Globe Life
GL
$13.9B
| $322K | ﹤0.01% |
2,300
-1,100
| -32% | -$149K |
|
|
INV
3738
Innventure Inc
INV
$249M
| $321K | ﹤0.01% |
+76,878
| New | +$323K |
|
3739
CALL
Costamare
CMRE
$1.86B
| $321K | ﹤0.01% |
41,600
-21,400
| -34% | -$296K |
|
3740
CALL
BTCS Inc
BTCS
$51.8M
| $321K | ﹤0.01% |
121,600
-17,000
| -12% | -$61.3K |
|
3741
PUT
Cheniere Energy
CQP
$31B
| $321K | ﹤0.01% |
6,000
-500
| -8% | -$26.5K |
|
3742
CALL
Weatherford International
WFRD
$5.99B
| $321K | ﹤0.01% |
4,100
-15,000
| -79% | -$1.09M |
|
3743
Cognex
CGNX
$10B
| $321K | ﹤0.01% |
8,909
+889
| +11% | +$36K |
|
3744
PUT
CVR Energy
CVI
$3.39B
| $321K | ﹤0.01% |
12,600
+4,300
| +52% | +$146K |
|
3745
PUT
Ormat Technologies
ORA
$6.05B
| $320K | ﹤0.01% |
2,900
-7,200
| -71% | -$788K |
|
3746
PUT
Anavex Life Sciences
AVXL
$238M
| $320K | ﹤0.01% |
89,900
-94,100
| -51% | -$576K |
|
3747
PUT
CPI Aerostructures
CVU
$66M
| $319K | ﹤0.01% |
+80,600
| New | +$221K |
|
3748
PUT
Eastman Chemical
EMN
$7.79B
| $319K | ﹤0.01% |
5,000
-2,100
| -30% | -$129K |
|
3749
PUT
Triple Flag Precious Metals
TFPM
$5.9B
| $319K | ﹤0.01% |
9,600
+4,800
| +100% | +$150K |
|
3750
PUT
AbCellera Biologics
ABCL
$1.62B
| $319K | ﹤0.01% |
93,200
+7,700
| +9% | +$34.4K |
|
Similar funds
Simplex Trading's Q4 2025 Portfolio in Review
As of Q4 2025, Simplex Trading held 10,526 positions worth $177B, down 9% from $195B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading withdrew a net $23.2B in Q4 2025, closing 2,184 positions and reducing 4,088 holdings. Its most notable exit was iShares Russell 2000 ETF, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.59% of assets, down from 0.79% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Western Digital worth $58.9M.
- Simplex Trading's largest Q4 2025 buy was Western Digital: 341,762 shares worth $58.9M.
- Simplex Trading added most to Netflix in Q4 2025, an estimated $73.1M increase.
- Simplex Trading's biggest Q4 2025 reduction was NVIDIA, cutting an estimated $262M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2025, selling an estimated $149M.
- Simplex Trading's ten largest holdings make up 49% of its $177B portfolio in Q4 2025.
- Simplex Trading opened 1,476 new positions and closed 2,184 in Q4 2025.
- Simplex Trading's portfolio value fell 9% quarter-over-quarter to $177B.
Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.