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 | |
|---|---|---|---|---|---|---|
|
VRNA
4351
PUT
DELISTED
Verona Pharma
VRNA
| $310K | ﹤0.01% |
19,300
-15,700
| -45% | -$271K |
|
4352
iShares Global Clean Energy ETF
ICLN
$2.22B
| $309K | ﹤0.01% |
+22,132
| New | +$312K |
|
4353
Energy Fuels
UUUU
$2.68B
| $309K | ﹤0.01% |
49,189
+25,437
| +107% | +$171K |
|
|
ARI
4354
PUT
Apollo Commercial Real Estate
ARI
$864M
| $308K | ﹤0.01% |
27,700
-4,500
| -14% | -$50.4K |
|
|
CALY
4355
PUT
Callaway Golf Company
CALY
$3.28B
| $308K | ﹤0.01% |
19,100
+300
| +2% | +$4.26K |
|
4356
CALL
uniQure
QURE
$2.78B
| $308K | ﹤0.01% |
59,300
+11,900
| +25% | +$68.3K |
|
4357
State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF
SPTM
$13.3B
| $308K | ﹤0.01% |
4,807
-11,217
| -70% | -$684K |
|
4358
PUT
Vitesse Energy
VTS
$644M
| $308K | ﹤0.01% |
13,000
+4,700
| +57% | +$103K |
|
4359
Worthington Enterprises
WOR
$2.74B
| $308K | ﹤0.01% |
+4,958
| New | +$295K |
|
4360
Freshworks
FRSH
$3.21B
| $307K | ﹤0.01% |
+16,912
| New | +$350K |
|
4361
CALL
Goldman Sachs BDC
GSBD
$997M
| $307K | ﹤0.01% |
20,500
+5,200
| +34% | +$78.7K |
|
4362
Ocular Therapeutix
OCUL
$1.83B
| $307K | ﹤0.01% |
33,841
-25,274
| -43% | -$179K |
|
4363
PUT
Pagaya Technologies
PGY
$1.35B
| $307K | ﹤0.01% |
30,400
+21,100
| +227% | +$300K |
|
4364
CALL
Blue Bird Corp
BLBD
$2.29B
| $306K | ﹤0.01% |
8,000
+4,600
| +135% | +$141K |
|
4365
Consolidated Edison
ED
$41.4B
| $306K | ﹤0.01% |
+3,373
| New | +$302K |
|
4366
VanEck JP Morgan EM Local Currency Bond ETF
EMLC
$4.76B
| $306K | ﹤0.01% |
+12,495
| New | +$310K |
|
4367
PUT
National Grid
NGG
$79.3B
| $306K | ﹤0.01% |
4,775
+2,334
| +96% | +$148K |
|
4368
CALL
Tenable Holdings
TENB
$3.47B
| $306K | ﹤0.01% |
6,200
-600
| -9% | -$28.5K |
|
4369
PUT
AAR Corp
AIR
$5.4B
| $305K | ﹤0.01% |
5,100
+4,100
| +410% | +$255K |
|
4370
Aldeyra Therapeutics
ALDX
$97.1M
| $305K | ﹤0.01% |
93,465
+71,887
| +333% | +$236K |
|
|
ITOS
4371
PUT
DELISTED
iTeos Therapeutics
ITOS
| $305K | ﹤0.01% |
22,400
-40,500
| -64% | -$441K |
|
4372
Ocugen
OCGN
$403M
| $305K | ﹤0.01% |
186,557
+125,951
| +208% | +$106K |
|
4373
CALL
Rollins
ROL
$18.6B
| $305K | ﹤0.01% |
6,600
-56,600
| -90% | -$2.5M |
|
|
WW
4374
DELISTED
WW International
WW
| $305K | ﹤0.01% |
+165,055
| New | +$657K |
|
4375
CALL
Extreme Networks
EXTR
$3.8B
| $304K | ﹤0.01% |
26,400
+11,300
| +75% | +$154K |
|
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.