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 | |
|---|---|---|---|---|---|---|
376
CALL
United Rentals
URI
$64.8B
| $43.7M | 0.03% |
60,600
-49,900
| -45% | -$32M |
|
377
PUT
C3.ai
AI
$1.27B
| $43M | 0.02% |
1,588,400
+579,500
| +57% | +$16.3M |
|
378
PUT
Crocs
CROX
$6.77B
| $43M | 0.02% |
298,800
-5,700
| -2% | -$649K |
|
379
PUT
Waste Management
WM
$94.9B
| $42.9M | 0.02% |
201,300
+59,700
| +42% | +$11.7M |
|
380
PUT
Abbott
ABT
$175B
| $42.8M | 0.02% |
376,500
+82,100
| +28% | +$9.41M |
|
381
CALL
EOG Resources
EOG
$76.7B
| $42.7M | 0.02% |
334,000
-63,300
| -16% | -$7.39M |
|
382
CALL
Valero Energy
VLO
$92.3B
| $42.6M | 0.02% |
249,500
-78,600
| -24% | -$11.3M |
|
383
PUT
Celsius Holdings
CELH
$7.28B
| $42.2M | 0.02% |
509,000
-292,900
| -37% | -$20.1M |
|
384
PUT
Cameco
CCJ
$39.4B
| $42M | 0.02% |
968,900
-46,200
| -5% | -$2.02M |
|
385
PUT
Li Auto
LI
$12B
| $41.6M | 0.02% |
1,373,800
-37,900
| -3% | -$1.25M |
|
386
CALL
Ulta Beauty
ULTA
$20.8B
| $41.6M | 0.02% |
79,500
-101,000
| -56% | -$52.2M |
|
387
CALL
Twilio
TWLO
$27.8B
| $41.4M | 0.02% |
676,300
+14,700
| +2% | +$968K |
|
388
CALL
NetApp
NTAP
$32.6B
| $41.2M | 0.02% |
392,900
+104,200
| +36% | +$9.66M |
|
389
CALL
Viking Therapeutics
VKTX
$4.33B
| $41.2M | 0.02% |
502,500
+156,800
| +45% | +$6.98M |
|
390
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$22B
| $41.2M | 0.02% |
+884,677
| New | +$34M |
|
391
PUT
Western Digital
WDC
$192B
| $41.1M | 0.02% |
796,711
-45,379
| -5% | -$1.99M |
|
392
Baidu
BIDU
$36.6B
| $41.1M | 0.02% |
390,036
+263,324
| +208% | +$28M |
|
393
CALL
S&P Global
SPGI
$127B
| $41M | 0.02% |
96,300
+39,100
| +68% | +$16.9M |
|
394
CALL
DexCom
DXCM
$27.6B
| $40.9M | 0.02% |
295,100
-194,800
| -40% | -$24.5M |
|
395
PUT
Atlassian
TEAM
$21.7B
| $40.7M | 0.02% |
208,700
+25,400
| +14% | +$5.54M |
|
396
CALL
Kroger
KR
$35.3B
| $40.5M | 0.02% |
709,700
+116,900
| +20% | +$5.76M |
|
|
397
CALL
Cameco
CCJ
$39.4B
| $40.4M | 0.02% |
932,600
-222,800
| -19% | -$9.77M |
|
398
CALL
Roku
ROKU
$21.2B
| $40.1M | 0.02% |
615,400
-183,100
| -23% | -$14.2M |
|
399
CALL
UiPath
PATH
$5.54B
| $40M | 0.02% |
1,765,900
+1,032,000
| +141% | +$24.2M |
|
400
CALL
Nucor
NUE
$53.7B
| $39.9M | 0.02% |
201,700
-15,600
| -7% | -$2.85M |
|
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.