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 | |
|---|---|---|---|---|---|---|
1426
PUT
PPG Industries
PPG
$25.9B
| $4.53M | ﹤0.01% |
34,900
-900
| -3% | -$126K |
|
1427
PUT
ResMed
RMD
$28.3B
| $4.52M | ﹤0.01% |
30,600
+30,100
| +6,020% | +$5.44M |
|
1428
Paychex
PAYX
$40.4B
| $4.52M | ﹤0.01% |
39,204
+17,281
| +79% | +$2.08M |
|
1429
Vodafone
VOD
$34.9B
| $4.52M | ﹤0.01% |
476,448
+236,040
| +98% | +$2.23M |
|
1430
CALL
Toro Company
TTC
$8.93B
| $4.51M | ﹤0.01% |
54,300
+43,300
| +394% | +$4.17M |
|
1431
GSK
GSK
$103B
| $4.51M | ﹤0.01% |
124,463
-26,816
| -18% | -$952K |
|
1432
CALL
Cinemark Holdings
CNK
$3.82B
| $4.5M | ﹤0.01% |
245,100
+37,900
| +18% | +$635K |
|
1433
PUT
Signet Jewelers
SIG
$3.55B
| $4.5M | ﹤0.01% |
62,600
+27,800
| +80% | +$2.06M |
|
1434
CALL
Jack Henry & Associates
JKHY
$10.7B
| $4.49M | ﹤0.01% |
29,700
+28,700
| +2,870% | +$4.63M |
|
1435
CALL
Asana
ASAN
$1.58B
| $4.49M | ﹤0.01% |
245,100
+128,600
| +110% | +$2.69M |
|
1436
PUT
Acadia Pharmaceuticals
ACAD
$4.25B
| $4.48M | ﹤0.01% |
215,000
+204,500
| +1,948% | +$5.55M |
|
1437
CALL
Starwood Property Trust
STWD
$6.12B
| $4.46M | ﹤0.01% |
230,400
+163,500
| +244% | +$3.32M |
|
|
CYBR
1438
PUT
DELISTED
CyberArk
CYBR
| $4.45M | ﹤0.01% |
27,200
+17,700
| +186% | +$2.84M |
|
1439
Dell
DELL
$283B
| $4.45M | ﹤0.01% |
+64,522
| New | +$3.84M |
|
|
MASI
1440
DELISTED
Masimo
MASI
| $4.44M | ﹤0.01% |
50,689
+46,724
| +1,178% | +$5.44M |
|
1441
CALL
Elastic
ESTC
$6.1B
| $4.44M | ﹤0.01% |
54,700
+2,700
| +5% | +$184K |
|
1442
CALL
SiriusXM
SIRI
$10B
| $4.44M | ﹤0.01% |
98,200
+67,990
| +225% | +$3.16M |
|
1443
CALL
Albertsons Companies
ACI
$5.4B
| $4.44M | ﹤0.01% |
195,000
+3,900
| +2% | +$87.1K |
|
1444
CALL
Nasdaq
NDAQ
$52.1B
| $4.44M | ﹤0.01% |
91,300
+13,100
| +17% | +$664K |
|
1445
CALL
American Eagle Outfitters
AEO
$2.85B
| $4.43M | ﹤0.01% |
266,700
+47,900
| +22% | +$708K |
|
1446
CALL
InMode
INMD
$872M
| $4.42M | ﹤0.01% |
145,000
+43,100
| +42% | +$1.69M |
|
1447
CALL
Newell Brands
NWL
$2.16B
| $4.4M | ﹤0.01% |
487,700
+140,400
| +40% | +$1.4M |
|
|
SGI
1448
PUT
Somnigroup International
SGI
$15.1B
| $4.4M | ﹤0.01% |
101,600
-45,000
| -31% | -$2M |
|
|
COOP
1449
PUT
DELISTED
Mr. Cooper
COOP
| $4.39M | ﹤0.01% |
81,900
-6,100
| -7% | -$335K |
|
1450
CALL
Iron Mountain
IRM
$38.2B
| $4.38M | ﹤0.01% |
73,700
-79,700
| -52% | -$4.87M |
|
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.