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 | |
|---|---|---|---|---|---|---|
|
WW
3576
CALL
DELISTED
WW International
WW
| $653K | ﹤0.01% |
353,000
-266,800
| -43% | -$1.06M |
|
3577
CALL
Designer Brands
DBI
$322M
| $652K | ﹤0.01% |
59,700
+11,600
| +24% | +$111K |
|
3578
Nutrien
NTR
$33.3B
| $652K | ﹤0.01% |
12,018
-4,053
| -25% | -$211K |
|
3579
Intuitive Surgical
ISRG
$130B
| $651K | ﹤0.01% |
1,632
-31,953
| -95% | -$12.1M |
|
3580
MGIC Investment
MTG
$6.47B
| $651K | ﹤0.01% |
+29,153
| New | +$582K |
|
3581
Powell Industries
POWL
$7.32B
| $651K | ﹤0.01% |
13,743
-363
| -3% | -$15.5K |
|
3582
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.95B
| $650K | ﹤0.01% |
22,900
-9,100
| -28% | -$228K |
|
3583
CALL
Trimble
TRMB
$13.6B
| $650K | ﹤0.01% |
10,100
-23,100
| -70% | -$1.32M |
|
|
JMIA
3584
PUT
Jumia Technologies
JMIA
$741M
| $649K | ﹤0.01% |
126,800
-131,500
| -51% | -$588K |
|
3585
Teladoc Health
TDOC
$1.69B
| $649K | ﹤0.01% |
43,002
-5,348
| -11% | -$97.1K |
|
3586
Allegro MicroSystems
ALGM
$8.29B
| $648K | ﹤0.01% |
+24,040
| New | +$695K |
|
3587
PUT
Telephone and Data Systems
TDS
$3.87B
| $648K | ﹤0.01% |
40,500
-34,700
| -46% | -$592K |
|
3588
Franklin Resources
BEN
$17.3B
| $647K | ﹤0.01% |
+23,024
| New | +$634K |
|
3589
CALL
Klaviyo
KVYO
$5.65B
| $647K | ﹤0.01% |
25,400
+15,900
| +167% | +$425K |
|
3590
CALL
Vertex
VERX
$2.14B
| $647K | ﹤0.01% |
20,400
+19,400
| +1,940% | +$523K |
|
3591
Atlas Energy Solutions
AESI
$1.37B
| $645K | ﹤0.01% |
+28,531
| New | +$532K |
|
3592
Silicon Laboratories
SLAB
$7.17B
| $645K | ﹤0.01% |
4,491
+2,303
| +105% | +$305K |
|
3593
CALL
Xenon Pharmaceuticals
XENE
$6.28B
| $645K | ﹤0.01% |
15,000
+12,500
| +500% | +$575K |
|
3594
CALL
Apple Hospitality REIT
APLE
$3.97B
| $643K | ﹤0.01% |
39,300
-104,000
| -73% | -$1.7M |
|
3595
CALL
Crescent Energy
CRGY
$3.44B
| $643K | ﹤0.01% |
54,100
+40,500
| +298% | +$456K |
|
3596
ProShares Short QQQ
PSQ
$840M
| $643K | ﹤0.01% |
+14,694
| New | +$670K |
|
3597
PUT
Carlyle Group
CG
$16.7B
| $642K | ﹤0.01% |
13,700
+4,300
| +46% | +$186K |
|
3598
CALL
Erie Indemnity
ERIE
$12.7B
| $642K | ﹤0.01% |
1,600
-700
| -30% | -$258K |
|
3599
CALL
Denison Mines
DNN
$2.49B
| $640K | ﹤0.01% |
328,600
-36,900
| -10% | -$70K |
|
3600
CALL
Magnolia Oil & Gas
MGY
$5.55B
| $638K | ﹤0.01% |
24,600
+3,600
| +17% | +$79K |
|
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.