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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
551
PUT
CarMax
KMX
$8.15B
| $25M | 0.01% |
323,700
+59,900
| +23% | +$4.74M |
|
552
CALL
Live Nation Entertainment
LYV
$41.4B
| $25M | 0.01% |
228,200
-241,800
| -51% | -$23.4M |
|
553
PUT
Seagate
STX
$205B
| $24.9M | 0.01% |
227,600
-107,700
| -32% | -$11M |
|
|
DOCU
554
CALL
DocuSign
DOCU
$9.14B
| $24.9M | 0.01% |
401,100
+133,200
| +50% | +$7.47M |
|
555
PUT
Digital Realty Trust
DLR
$66B
| $24.9M | 0.01% |
153,800
-115,200
| -43% | -$17.7M |
|
556
CALL
Truist Financial
TFC
$63.2B
| $24.9M | 0.01% |
581,300
+26,200
| +5% | +$1.11M |
|
557
CALL
Warner Bros
WBD
$64.8B
| $24.7M | 0.01% |
2,992,500
+941,600
| +46% | +$7.36M |
|
558
PUT
DexCom
DXCM
$27.6B
| $24.7M | 0.01% |
368,000
+17,100
| +5% | +$1.4M |
|
559
CALL
Rio Tinto
RIO
$150B
| $24.6M | 0.01% |
346,200
+69,300
| +25% | +$4.45M |
|
560
CALL
Prologis
PLD
$135B
| $24.6M | 0.01% |
195,100
+45,200
| +30% | +$5.61M |
|
561
PUT
SoFi Technologies
SOFI
$21.9B
| $24.4M | 0.01% |
3,104,500
-199,000
| -6% | -$1.45M |
|
562
PUT
Darden Restaurants
DRI
$22.2B
| $24.3M | 0.01% |
148,200
+51,300
| +53% | +$7.77M |
|
563
CALL
BP
BP
$112B
| $24.2M | 0.01% |
770,700
-139,700
| -15% | -$4.73M |
|
564
PUT
American International
AIG
$41.5B
| $24.2M | 0.01% |
330,300
-58,400
| -15% | -$4.35M |
|
565
CALL
Ross Stores
ROST
$76.4B
| $24.2M | 0.01% |
160,700
+78,000
| +94% | +$11.5M |
|
566
PUT
Etsy
ETSY
$7.64B
| $24.2M | 0.01% |
435,400
-20,900
| -5% | -$1.19M |
|
567
CALL
Amphenol
APH
$194B
| $24.1M | 0.01% |
370,200
-46,600
| -11% | -$3.02M |
|
568
PUT
Tractor Supply
TSCO
$15.4B
| $24.1M | 0.01% |
414,500
-35,000
| -8% | -$1.88M |
|
569
PUT
Lumen
LUMN
$6.9B
| $24.1M | 0.01% |
3,394,200
+2,419,500
| +248% | +$10.3M |
|
570
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $24M | 0.01% |
525,200
-49,100
| -9% | -$1.07M |
|
571
CALL
Wheaton Precious Metals
WPM
$50.6B
| $23.9M | 0.01% |
392,000
+85,600
| +28% | +$5.09M |
|
572
CALL
Duke Energy
DUK
$99.7B
| $23.9M | 0.01% |
207,600
+2,300
| +1% | +$256K |
|
573
PUT
Steel Dynamics
STLD
$34.4B
| $23.9M | 0.01% |
189,800
+81,200
| +75% | +$9.87M |
|
574
CALL
Aflac
AFL
$62.9B
| $23.7M | 0.01% |
211,700
+54,500
| +35% | +$5.54M |
|
575
CALL
Dominion Energy
D
$62.5B
| $23.6M | 0.01% |
408,800
+10,700
| +3% | +$585K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.