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 | |
|---|---|---|---|---|---|---|
7101
First Trust NASDAQ Clean Edge Green Energy Index Fund
QCLN
$569M
| $8.38K | ﹤0.01% |
+188
| New | +$8.46K |
|
|
CVSA
7102
Covista Inc
CVSA
$4.55B
| $8.38K | ﹤0.01% |
81
-318
| -80% | -$36.4K |
|
7103
CALL
Bassett Furniture
BSET
$169M
| $8.38K | ﹤0.01% |
500
+300
| +150% | +$4.7K |
|
7104
Farmers National Banc Corp
FMNB
$945M
| $8.38K | ﹤0.01% |
629
-66
| -9% | -$903 |
|
7105
Purple Innovation
PRPL
$34.5M
| $8.35K | ﹤0.01% |
484
-630
| -57% | -$12.6K |
|
7106
PUT
AvePoint
AVPT
$2.76B
| $8.33K | ﹤0.01% |
600
+300
| +100% | +$4.14K |
|
|
GAMB
7107
DELISTED
Gambling.com
GAMB
| $8.28K | ﹤0.01% |
1,517
-16,103
| -91% | -$102K |
|
|
SVC
7108
CALL
Service Properties Trust
SVC
$1.05B
| $8.28K | ﹤0.01% |
900
-12,900
| -93% | -$130K |
|
7109
CALL
AAR Corp
AIR
$5.4B
| $8.28K | ﹤0.01% |
100
-21,300
| -100% | -$1.76M |
|
|
SOBO
7110
PUT
South Bow Corp
SOBO
$7.79B
| $8.24K | ﹤0.01% |
+300
| New | +$8.15K |
|
|
GTY
7111
CALL
Getty Realty Corp
GTY
$2.16B
| $8.21K | ﹤0.01% |
300
-900
| -75% | -$24.9K |
|
|
GTY
7112
PUT
Getty Realty Corp
GTY
$2.16B
| $8.21K | ﹤0.01% |
300
+200
| +200% | +$5.53K |
|
7113
MacroGenics
MGNX
$233M
| $8.21K | ﹤0.01% |
5,097
-2,027
| -28% | -$3.19K |
|
7114
PUT
Telephone and Data Systems
TDS
$3.87B
| $8.2K | ﹤0.01% |
200
-5,200
| -96% | -$203K |
|
7115
PUT
Safe Bulkers
SB
$772M
| $8.19K | ﹤0.01% |
+1,700
| New | +$8.06K |
|
|
STRZ
7116
PUT
Starz Entertainment Corp
STRZ
$439M
| $8.19K | ﹤0.01% |
+700
| New | +$8.02K |
|
7117
CALL
Pulmonx
LUNG
$52.8M
| $8.18K | ﹤0.01% |
3,700
-3,500
| -49% | -$6.58K |
|
7118
PUT
Cadre Holdings
CDRE
$1.31B
| $8.17K | ﹤0.01% |
200
+100
| +100% | +$4.16K |
|
7119
Commercial Metals
CMC
$7.53B
| $8.17K | ﹤0.01% |
+118
| New | +$7.39K |
|
|
CHMI
7120
CALL
Cherry Hill Mortgage Investment Corp
CHMI
$82.3M
| $8.16K | ﹤0.01% |
+3,200
| New | +$7.79K |
|
|
OMDA
7121
Omada Health Inc
OMDA
$1.17B
| $8.16K | ﹤0.01% |
517
+365
| +240% | +$7.4K |
|
7122
CALL
Enlivex Ltd
ENLV
$37.9M
| $8.16K | ﹤0.01% |
773
-554
| -42% | -$8.26K |
|
7123
CALL
Agilon Health
AGL
$1.55B
| $8.13K | ﹤0.01% |
472
-2,680
| -85% | -$52K |
|
7124
Spruce Power Holding Corp
SPRU
$36.6M
| $8.12K | ﹤0.01% |
1,595
+211
| +15% | +$855 |
|
7125
SiriusPoint
SPNT
$3.03B
| $8.1K | ﹤0.01% |
370
-230
| -38% | -$4.61K |
|
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.