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 | |
|---|---|---|---|---|---|---|
|
IRBT
2451
PUT
DELISTED
iRobot
IRBT
| $1.91M | ﹤0.01% |
217,800
-88,100
| -29% | -$1.42M |
|
2452
CALL
Guidewire Software
GWRE
$11.5B
| $1.9M | ﹤0.01% |
16,300
-12,200
| -43% | -$1.39M |
|
2453
CALL
Acadia Healthcare
ACHC
$3.17B
| $1.9M | ﹤0.01% |
24,000
-9,500
| -28% | -$777K |
|
2454
Air Products & Chemicals
APD
$66.3B
| $1.9M | ﹤0.01% |
7,838
-23,907
| -75% | -$5.86M |
|
|
TPH
2455
CALL
DELISTED
Tri Pointe Homes
TPH
| $1.9M | ﹤0.01% |
49,100
+40,700
| +485% | +$1.43M |
|
2456
PUT
ImmunityBio
IBRX
$7.44B
| $1.9M | ﹤0.01% |
353,100
+266,700
| +309% | +$1.21M |
|
2457
Groupon
GRPN
$980M
| $1.89M | ﹤0.01% |
+142,048
| New | +$2.16M |
|
2458
CALL
Banc of California
BANC
$3.28B
| $1.89M | ﹤0.01% |
124,400
-37,600
| -23% | -$523K |
|
2459
PUT
Manchester United
MANU
$3.91B
| $1.89M | ﹤0.01% |
135,500
-170,600
| -56% | -$3.01M |
|
|
CALY
2460
CALL
Callaway Golf Company
CALY
$3.26B
| $1.89M | ﹤0.01% |
116,900
+82,000
| +235% | +$1.17M |
|
2461
Perion Network
PERI
$367M
| $1.89M | ﹤0.01% |
+84,035
| New | +$2.14M |
|
2462
CALL
Sociedad Química y Minera de Chile
SQM
$19.6B
| $1.89M | ﹤0.01% |
38,400
-38,100
| -50% | -$1.79M |
|
2463
PUT
Lightspeed Commerce
LSPD
$1.3B
| $1.89M | ﹤0.01% |
134,200
+47,500
| +55% | +$754K |
|
2464
Quest Diagnostics
DGX
$25.1B
| $1.88M | ﹤0.01% |
+14,148
| New | +$1.84M |
|
2465
iShares MSCI Mexico ETF
EWW
$1.89B
| $1.88M | ﹤0.01% |
+27,172
| New | +$1.81M |
|
2466
Tradeweb Markets
TW
$21.3B
| $1.88M | ﹤0.01% |
18,081
-3,028
| -14% | -$304K |
|
2467
PUT
BorgWarner
BWA
$13.2B
| $1.88M | ﹤0.01% |
54,200
+31,400
| +138% | +$1.03M |
|
2468
CALL
Canadian Solar
CSIQ
$906M
| $1.88M | ﹤0.01% |
95,200
-24,000
| -20% | -$517K |
|
2469
Alliance Resource Partners
ARLP
$3.18B
| $1.88M | ﹤0.01% |
93,769
+67,411
| +256% | +$1.37M |
|
2470
PUT
Range Resources
RRC
$9.11B
| $1.88M | ﹤0.01% |
54,600
-6,700
| -11% | -$207K |
|
2471
PUT
Republic Services
RSG
$66.7B
| $1.88M | ﹤0.01% |
9,800
-2,900
| -23% | -$515K |
|
2472
PUT
Assured Guaranty
AGO
$3.78B
| $1.88M | ﹤0.01% |
21,500
+17,400
| +424% | +$1.47M |
|
2473
CALL
Herbalife
HLF
$1.23B
| $1.87M | ﹤0.01% |
186,100
+54,400
| +41% | +$585K |
|
2474
CALL
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $1.87M | ﹤0.01% |
15,900
+3,700
| +30% | +$232K |
|
2475
Fomento Económico Mexicano
FMX
$43.3B
| $1.87M | ﹤0.01% |
+14,331
| New | +$1.87M |
|
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.