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 | |
|---|---|---|---|---|---|---|
|
LAC
5701
Lithium Americas
LAC
$1.01B
| $89K | ﹤0.01% |
+13,302
| New | +$69.1K |
|
5702
CALL
Lifecore Biomedical
LFCR
$166M
| $89K | ﹤0.01% |
16,900
+15,900
| +1,590% | +$114K |
|
5703
Outset Medical
OM
$84.7M
| $89K | ﹤0.01% |
2,687
-454
| -14% | -$23K |
|
5704
PUT
Park Hotels & Resorts
PK
$3.03B
| $89K | ﹤0.01% |
5,100
-100
| -2% | -$1.62K |
|
5705
CALL
Perdoceo Education
PRDO
$1.99B
| $89K | ﹤0.01% |
5,100
+4,500
| +750% | +$79.5K |
|
5706
Invesco Dorsey Wright Technology Momentum ETF
PTF
$593M
| $89K | ﹤0.01% |
1,565
+1,542
| +6,704% | +$82K |
|
5707
PUT
Protagonist Therapeutics
PTGX
$8.79B
| $89K | ﹤0.01% |
3,100
-16,200
| -84% | -$441K |
|
5708
PUT
Resources Connection
RGP
$151M
| $89K | ﹤0.01% |
6,800
+400
| +6% | +$5.34K |
|
5709
PUT
Sonos
SONO
$1.73B
| $89K | ﹤0.01% |
4,700
-6,800
| -59% | -$121K |
|
5710
ProShares UltraShort Russell2000
TWM
$44.3M
| $89K | ﹤0.01% |
1,716
-866
| -34% | -$51.1K |
|
5711
Direxion Daily Utilities Bull 3X ETF
UTSL
$40M
| $89K | ﹤0.01% |
3,911
+2,600
| +198% | +$51.5K |
|
5712
CALL
Brady Corp
BRC
$4.44B
| $88K | ﹤0.01% |
1,500
-6,200
| -81% | -$370K |
|
5713
PUT
Bit Digital
BTBT
$463M
| $88K | ﹤0.01% |
31,000
-30,400
| -50% | -$83.8K |
|
5714
iHeartMedia
IHRT
$543M
| $88K | ﹤0.01% |
42,572
-144,136
| -77% | -$339K |
|
|
KALV
5715
CALL
DELISTED
KalVista Pharmaceuticals
KALV
| $88K | ﹤0.01% |
7,500
-402,100
| -98% | -$5.36M |
|
5716
CALL
Monro
MNRO
$383M
| $88K | ﹤0.01% |
2,800
+1,500
| +115% | +$46.4K |
|
|
5717
PUT
Monro
MNRO
$383M
| $88K | ﹤0.01% |
2,800
-4,700
| -63% | -$145K |
|
5718
PUT
Napco Security Technologies
NSSC
$1.32B
| $88K | ﹤0.01% |
2,200
-1,400
| -39% | -$54.9K |
|
5719
PUT
Seanergy Maritime Holdings
SHIP
$379M
| $88K | ﹤0.01% |
10,200
-17,900
| -64% | -$142K |
|
5720
ProShares UltraShort Real Estate
SRS
$15.3M
| $88K | ﹤0.01% |
1,518
+747
| +97% | +$45.5K |
|
|
YALA
5721
Yalla Group
YALA
$818M
| $88K | ﹤0.01% |
18,397
+2,211
| +14% | +$11.4K |
|
|
MOR
5722
DELISTED
MorphoSys AG American Depositary Shares
MOR
| $88K | ﹤0.01% |
4,859
-117,755
| -96% | -$1.74M |
|
5723
CALL
Arbutus Biopharma
ABUS
$857M
| $87K | ﹤0.01% |
33,800
-51,800
| -61% | -$134K |
|
5724
PUT
FuelCell Energy
FCEL
$1.73B
| $87K | ﹤0.01% |
2,463
+1,606
| +187% | +$59.2K |
|
5725
CALL
IDEAYA Biosciences
IDYA
$3.42B
| $87K | ﹤0.01% |
2,000
+300
| +18% | +$12.9K |
|
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.