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 |
Pfizer
PFE
|
+$89.5M |
| 2 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$85.5M |
| 3 |
Boeing
BA
|
+$71M |
| 4 |
Intel
INTC
|
+$60.7M |
| 5 |
Meta Platforms (Facebook)
META
|
+$48.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$117M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$104M |
| 3 |
Alibaba
BABA
|
+$82.8M |
| 4 |
Walt Disney
DIS
|
+$68.5M |
| 5 |
Citigroup
C
|
+$59.8M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.38% |
| 2 | Healthcare | 0.27% |
| 3 | Consumer Discretionary | 0.25% |
| 4 | Industrials | 0.17% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4251
PUT
Glaukos
GKOS
$9.49B
| $339K | ﹤0.01% |
3,600
-31,700
| -90% | -$2.83M |
|
4252
CALL
Genie Energy
GNE
$370M
| $339K | ﹤0.01% |
22,500
+11,800
| +110% | +$227K |
|
4253
Mercer International
MERC
$40.5M
| $339K | ﹤0.01% |
34,162
-17,164
| -33% | -$154K |
|
4254
Trex
TREX
$4.4B
| $338K | ﹤0.01% |
3,390
-8,768
| -72% | -$781K |
|
4255
PUT
Stoke Therapeutics
STOK
$1.84B
| $337K | ﹤0.01% |
+25,000
| New | +$151K |
|
4256
PUT
Tenaris
TS
$28.2B
| $337K | ﹤0.01% |
8,600
-19,800
| -70% | -$686K |
|
|
SRCL
4257
PUT
DELISTED
Stericycle Inc
SRCL
| $337K | ﹤0.01% |
6,400
+1,400
| +28% | +$70.4K |
|
4258
Eversource Energy
ES
$28.1B
| $336K | ﹤0.01% |
5,631
+803
| +17% | +$46.2K |
|
4259
PUT
Gaming and Leisure Properties
GLPI
$13B
| $336K | ﹤0.01% |
7,300
+6,200
| +564% | +$285K |
|
|
HIMX
4260
PUT
Himax Technologies
HIMX
$2.03B
| $336K | ﹤0.01% |
62,900
+29,200
| +87% | +$167K |
|
4261
CALL
O-I Glass
OI
$1.18B
| $336K | ﹤0.01% |
20,300
+18,100
| +823% | +$286K |
|
4262
PUT
Armstrong World Industries
AWI
$7.37B
| $335K | ﹤0.01% |
2,700
+500
| +23% | +$55.2K |
|
|
DRD
4263
PUT
DRDGold
DRD
$1.75B
| $335K | ﹤0.01% |
40,900
+19,100
| +88% | +$145K |
|
4264
PUT
IPG Photonics
IPGP
$3.4B
| $335K | ﹤0.01% |
3,700
-3,700
| -50% | -$348K |
|
4265
CALL
X4 Pharmaceuticals
XFOR
$377M
| $335K | ﹤0.01% |
8,037
+6,957
| +644% | +$194K |
|
4266
PUT
CNX Resources
CNX
$4.91B
| $334K | ﹤0.01% |
14,100
-8,300
| -37% | -$172K |
|
4267
PUT
Cooper Companies
COO
$14.2B
| $334K | ﹤0.01% |
3,300
-16,300
| -83% | -$1.58M |
|
4268
CALL
Camden Property Trust
CPT
$11.5B
| $334K | ﹤0.01% |
3,400
-10,900
| -76% | -$1.05M |
|
|
SCS
4269
CALL
DELISTED
Steelcase
SCS
| $334K | ﹤0.01% |
25,600
-45,000
| -64% | -$578K |
|
4270
PUT
10x Genomics
TXG
$5.88B
| $334K | ﹤0.01% |
8,900
-6,500
| -42% | -$286K |
|
|
AIRC
4271
PUT
DELISTED
Apartment Income REIT Corp.
AIRC
| $334K | ﹤0.01% |
10,300
+6,800
| +194% | +$221K |
|
|
BLUE
4272
DELISTED
bluebird bio
BLUE
| $333K | ﹤0.01% |
13,027
+364
| +3% | +$9.33K |
|
4273
CALL
Dorchester Minerals
DMLP
$1.3B
| $333K | ﹤0.01% |
9,900
+400
| +4% | +$12.6K |
|
4274
CALL
Phathom Pharmaceuticals
PHAT
$928M
| $333K | ﹤0.01% |
31,400
+18,400
| +142% | +$156K |
|
4275
Pultegroup
PHM
$25.2B
| $332K | ﹤0.01% |
+2,759
| New | +$296K |
|
Similar funds
Simplex Trading's Q1 2024 Portfolio in Review
As of Q1 2024, Simplex Trading held 10,366 positions worth $173B, up 11% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading's Q1 2024 filing shows 1,549 new, 3,675 increased, 3,484 reduced and 1,506 closed positions. Its largest new stake was Boeing: 345,653 shares worth $66.7M. The largest sale was NVIDIA, an estimated $117M.
By sector, the portfolio is most concentrated in Technology at 0.38% of assets, up from 0.33% a quarter earlier, followed by Healthcare and Consumer Discretionary.
- Simplex Trading's largest Q1 2024 buy was Boeing: 345,653 shares worth $66.7M.
- Simplex Trading added most to Pfizer in Q1 2024, an estimated $89.5M increase.
- Simplex Trading's biggest Q1 2024 reduction was NVIDIA, cutting an estimated $117M.
- Simplex Trading fully exited Citigroup in Q1 2024, selling an estimated $59.8M.
- Simplex Trading's ten largest holdings make up 47% of its $173B portfolio in Q1 2024.
- Simplex Trading opened 1,549 new positions and closed 1,506 in Q1 2024.
- Simplex Trading's portfolio value rose 11% quarter-over-quarter to $173B.
Based on Simplex Trading's 13F filing for Q1 2024, filed 25 Apr 2024.