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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
526
CALL
Invesco Aerospace & Defense ETF
PPA
$8.03B
| $23.5M | 0.02% |
207,100
-29,600
| -13% | -$2.47M |
|
527
CALL
Akamai
AKAM
$18.1B
| $23.4M | 0.02% |
219,700
-180,700
| -45% | -$18M |
|
528
CALL
Clorox
CLX
$11.6B
| $23.4M | 0.02% |
178,400
+111,400
| +166% | +$16.9M |
|
|
SCIU
529
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $23M | 0.02% |
834,500
+370,700
| +80% | +$10.2M |
|
530
PUT
Abbott
ABT
$175B
| $23M | 0.02% |
237,800
-11,400
| -5% | -$1.2M |
|
531
CALL
Marathon Digital Holdings
MARA
$4.73B
| $23M | 0.02% |
2,707,600
+953,600
| +54% | +$12.8M |
|
532
PUT
SoFi Technologies
SOFI
$21.9B
| $22.9M | 0.02% |
2,872,200
+191,200
| +7% | +$1.68M |
|
533
CALL
Albemarle
ALB
$13.9B
| $22.8M | 0.02% |
134,100
-76,800
| -36% | -$15.3M |
|
534
PUT
PBF Energy
PBF
$7.61B
| $22.8M | 0.02% |
425,300
+158,300
| +59% | +$7.54M |
|
|
B
535
PUT
Barrick Mining
B
$62.8B
| $22.7M | 0.02% |
1,562,600
+58,900
| +4% | +$966K |
|
536
PUT
CME Group
CME
$90.1B
| $22.7M | 0.02% |
113,500
+77,200
| +213% | +$15.3M |
|
537
CALL
Cummins
CMI
$91.2B
| $22.7M | 0.02% |
99,200
+32,500
| +49% | +$7.85M |
|
538
PUT
Dollar Tree
DLTR
$23.5B
| $22.6M | 0.02% |
212,600
-5,600
| -3% | -$750K |
|
539
CALL
Sony
SONY
$123B
| $22.6M | 0.02% |
1,371,500
+534,000
| +64% | +$9.32M |
|
540
Salesforce
CRM
$133B
| $22.5M | 0.02% |
111,199
+89,806
| +420% | +$19.4M |
|
|
WBA
541
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $22.5M | 0.02% |
1,012,500
+98,900
| +11% | +$2.63M |
|
542
Procter & Gamble
PG
$347B
| $22.4M | 0.02% |
153,335
-15,725
| -9% | -$2.4M |
|
543
CALL
EQT Corp
EQT
$33.8B
| $22.4M | 0.02% |
550,900
+29,300
| +6% | +$1.21M |
|
544
PUT
Skyworks Solutions
SWKS
$9.5B
| $22.2M | 0.02% |
225,400
-8,000
| -3% | -$851K |
|
545
CALL
Emerson Electric
EMR
$78.2B
| $22.2M | 0.02% |
229,800
-36,800
| -14% | -$3.5M |
|
546
PUT
Avis
CAR
$5.81B
| $22.2M | 0.02% |
123,400
-19,300
| -14% | -$4.18M |
|
547
Alibaba
BABA
$279B
| $22.1M | 0.02% |
255,365
-10,434
| -4% | -$955K |
|
548
PUT
KLA
KLAC
$280B
| $22.1M | 0.02% |
482,000
-202,000
| -30% | -$9.69M |
|
|
WBA
549
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $22.1M | 0.02% |
993,000
+335,000
| +51% | +$8.91M |
|
550
CALL
Northrop Grumman
NOC
$74.6B
| $22.1M | 0.02% |
50,100
-4,700
| -9% | -$2.06M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.