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 | |
|---|---|---|---|---|---|---|
326
PUT
D.R. Horton
DHI
$40.4B
| $53.8M | 0.03% |
327,200
-151,100
| -32% | -$22.7M |
|
327
CALL
Zillow
Z
$7.18B
| $53.4M | 0.03% |
1,096,300
+422,200
| +63% | +$23M |
|
328
CALL
Diamondback Energy
FANG
$57.1B
| $53.4M | 0.03% |
269,400
-67,400
| -20% | -$11.4M |
|
329
PUT
Ford
F
$57.5B
| $53.2M | 0.03% |
4,008,100
+842,600
| +27% | +$10.2M |
|
330
PUT
Devon Energy
DVN
$51.8B
| $52.8M | 0.03% |
1,052,500
+229,900
| +28% | +$10.2M |
|
331
CALL
Northrop Grumman
NOC
$74.6B
| $52.6M | 0.03% |
109,800
+24,200
| +28% | +$11.1M |
|
|
332
Meta Platforms (Facebook)
META
$1.59T
| $52.5M | 0.03% |
+108,215
| New | +$48.3M |
|
333
PUT
Danaher
DHR
$127B
| $52.1M | 0.03% |
255,000
+63,900
| +33% | +$15.6M |
|
334
CALL
Roblox
RBLX
$35.5B
| $52.1M | 0.03% |
1,364,800
-1,406,300
| -51% | -$57.1M |
|
335
CALL
Marathon Digital Holdings
MARA
$4.73B
| $52M | 0.03% |
2,302,900
-2,353,500
| -51% | -$51.4M |
|
336
CALL
Pinterest
PINS
$12.6B
| $51.6M | 0.03% |
1,488,700
-380,600
| -20% | -$13.8M |
|
337
CALL
DoorDash
DASH
$77.4B
| $51.4M | 0.03% |
372,900
-66,700
| -15% | -$7.86M |
|
338
PUT
American Tower
AMT
$77.4B
| $51.1M | 0.03% |
258,700
+48,500
| +23% | +$9.66M |
|
339
CALL
Trade Desk
TTD
$8.26B
| $50.9M | 0.03% |
581,800
+22,000
| +4% | +$1.67M |
|
340
PUT
Wingstop
WING
$3.76B
| $50.8M | 0.03% |
138,600
+49,300
| +55% | +$15.3M |
|
341
CALL
Blackrock
BLK
$164B
| $49.8M | 0.03% |
59,700
-6,600
| -10% | -$5.3M |
|
342
CALL
DuPont de Nemours
DD
$18.9B
| $49.7M | 0.03% |
516,160
+316,834
| +159% | +$28.2M |
|
343
CALL
NXP Semiconductors
NXPI
$70.4B
| $49.6M | 0.03% |
200,100
+101,300
| +103% | +$23.4M |
|
344
PUT
Coca-Cola
KO
$354B
| $49.5M | 0.03% |
809,200
-253,100
| -24% | -$15.2M |
|
345
PUT
e.l.f. Beauty
ELF
$4.66B
| $49.3M | 0.03% |
251,400
+71,500
| +40% | +$12.7M |
|
346
PUT
Analog Devices
ADI
$188B
| $49M | 0.03% |
247,500
+93,700
| +61% | +$18M |
|
347
CALL
United Airlines
UAL
$38.1B
| $48.9M | 0.03% |
1,021,000
+157,100
| +18% | +$6.73M |
|
348
CALL
SLB Ltd
SLB
$71.3B
| $48.9M | 0.03% |
925,100
-26,200
| -3% | -$1.32M |
|
349
PUT
Dell
DELL
$285B
| $48.6M | 0.03% |
426,200
+280,200
| +192% | +$26.1M |
|
350
PUT
Digital Realty Trust
DLR
$66B
| $48.5M | 0.03% |
336,600
+69,700
| +26% | +$9.85M |
|
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.