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 | |
|---|---|---|---|---|---|---|
426
CALL
Synopsys
SNPS
$72.3B
| $36.7M | 0.02% |
64,300
+24,100
| +60% | +$13.3M |
|
427
PUT
Boston Scientific
BSX
$63.9B
| $36.7M | 0.02% |
536,500
+305,700
| +132% | +$19.7M |
|
428
CALL
Okta
OKTA
$23.8B
| $36.7M | 0.02% |
351,000
-285,400
| -45% | -$26.3M |
|
429
CALL
Wynn Resorts
WYNN
$9.79B
| $36.7M | 0.02% |
358,800
-161,500
| -31% | -$16M |
|
430
CALL
Affirm
AFRM
$24.8B
| $36.7M | 0.02% |
983,900
-605,800
| -38% | -$24.2M |
|
431
PUT
Thermo Fisher Scientific
TMO
$196B
| $36.6M | 0.02% |
62,900
+700
| +1% | +$393K |
|
432
CALL
NextEra Energy
NEE
$186B
| $36.5M | 0.02% |
571,800
-268,400
| -32% | -$15.7M |
|
433
PUT
Mercado Libre
MELI
$91.2B
| $36.4M | 0.02% |
24,100
-11,400
| -32% | -$18.7M |
|
434
PUT
Blackrock
BLK
$164B
| $36.2M | 0.02% |
43,400
-31,600
| -42% | -$25.4M |
|
|
WBA
435
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $36.2M | 0.02% |
1,668,000
-565,300
| -25% | -$12.6M |
|
436
CALL
Rivian
RIVN
$24.9B
| $36.1M | 0.02% |
3,300,000
+126,000
| +4% | +$1.82M |
|
437
CALL
Duke Energy
DUK
$99.7B
| $36.1M | 0.02% |
373,000
+109,900
| +42% | +$10.4M |
|
438
CALL
Chewy
CHWY
$8.81B
| $35.9M | 0.02% |
2,258,600
+1,333,000
| +144% | +$23.9M |
|
439
PUT
DaVita
DVA
$14.9B
| $35.9M | 0.02% |
260,100
-122,600
| -32% | -$14.7M |
|
440
CALL
KLA
KLAC
$280B
| $35.9M | 0.02% |
514,000
-334,000
| -39% | -$21.4M |
|
441
PUT
Constellation Energy
CEG
$98.2B
| $35.9M | 0.02% |
194,200
+123,700
| +175% | +$17.6M |
|
442
PUT
Snap
SNAP
$7.52B
| $35.9M | 0.02% |
3,126,000
+422,100
| +16% | +$5.66M |
|
|
443
CALL
Mercado Libre
MELI
$91.2B
| $35.8M | 0.02% |
23,700
-16,800
| -41% | -$27.5M |
|
444
CALL
Air Products & Chemicals
APD
$66.1B
| $35.8M | 0.02% |
147,900
+27,000
| +22% | +$6.62M |
|
445
CALL
Hershey
HSY
$35B
| $35.8M | 0.02% |
184,100
-23,800
| -11% | -$4.59M |
|
446
PUT
Gilead Sciences
GILD
$162B
| $35.7M | 0.02% |
487,900
+67,300
| +16% | +$5.18M |
|
447
PUT
Phillips 66
PSX
$84.8B
| $35.7M | 0.02% |
218,800
-45,700
| -17% | -$6.59M |
|
448
CALL
Zoom
ZM
$25.2B
| $35.7M | 0.02% |
546,400
-351,000
| -39% | -$23.4M |
|
449
PUT
Northrop Grumman
NOC
$74.6B
| $35.5M | 0.02% |
74,200
-3,200
| -4% | -$1.47M |
|
450
PUT
Align Technology
ALGN
$12.4B
| $35.5M | 0.02% |
108,300
-20,500
| -16% | -$6.01M |
|
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.