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 | |
|---|---|---|---|---|---|---|
3451
PUT
Xerox
XRX
$357M
| $478K | ﹤0.01% |
30,500
-14,800
| -33% | -$234K |
|
3452
CALL
Atlas Energy Solutions
AESI
$1.38B
| $477K | ﹤0.01% |
+21,500
| New | +$450K |
|
3453
CALL
Immatics
IMTX
$1.15B
| $477K | ﹤0.01% |
41,200
+15,200
| +58% | +$181K |
|
3454
PUT
Oshkosh
OSK
$9.41B
| $477K | ﹤0.01% |
5,000
-3,100
| -38% | -$301K |
|
|
PMT
3455
CALL
PennyMac Mortgage Investment
PMT
$855M
| $477K | ﹤0.01% |
38,500
-1,100
| -3% | -$14.4K |
|
|
CMRC
3456
CALL
Commerce.com Inc Series 1
CMRC
$263M
| $476K | ﹤0.01% |
48,300
+37,000
| +327% | +$385K |
|
3457
ProShares UltraShort Bloomberg Natural Gas
KOLD
$120M
| $476K | ﹤0.01% |
+15,612
| New | +$455K |
|
3458
CALL
MINISO
MNSO
$3.75B
| $476K | ﹤0.01% |
18,400
-60,000
| -77% | -$1.34M |
|
|
RVNC
3459
CALL
DELISTED
Revance Therapeutics, Inc.
RVNC
| $476K | ﹤0.01% |
41,500
-3,000
| -7% | -$57.7K |
|
3460
Burford Capital
BUR
$955M
| $475K | ﹤0.01% |
33,943
+9,590
| +39% | +$131K |
|
3461
CALL
CenterPoint Energy
CNP
$29.1B
| $475K | ﹤0.01% |
17,700
+2,000
| +13% | +$57.8K |
|
|
MCHB
3462
PUT
Mechanics Bancorp
MCHB
$3.48B
| $475K | ﹤0.01% |
61,100
+52,900
| +645% | +$470K |
|
3463
IonQ
IONQ
$12.5B
| $475K | ﹤0.01% |
31,988
-8,346
| -21% | -$131K |
|
3464
CALL
Credo Technology Group
CRDO
$36.3B
| $474K | ﹤0.01% |
31,100
-63,000
| -67% | -$994K |
|
3465
CALL
Elanco Animal Health
ELAN
$12.9B
| $474K | ﹤0.01% |
42,200
-43,000
| -50% | -$499K |
|
3466
CALL
Seres Therapeutics
MCRB
$46.5M
| $474K | ﹤0.01% |
9,960
+3,765
| +61% | +$287K |
|
3467
CALL
TeraWulf
WULF
$8.2B
| $474K | ﹤0.01% |
376,600
+163,100
| +76% | +$387K |
|
|
BERY
3468
DELISTED
Berry Global Group, Inc.
BERY
| $474K | ﹤0.01% |
+8,350
| New | +$491K |
|
3469
CALL
Pulmonx
LUNG
$54.1M
| $473K | ﹤0.01% |
45,800
+21,500
| +88% | +$249K |
|
3470
ProShares UltraPro Dow 30
UDOW
$859M
| $473K | ﹤0.01% |
17,594
-10,812
| -38% | -$327K |
|
|
PGTI
3471
DELISTED
PGT, Inc.
PGTI
| $473K | ﹤0.01% |
+17,079
| New | +$471K |
|
|
JNPR
3472
PUT
DELISTED
Juniper Networks
JNPR
| $472K | ﹤0.01% |
17,000
-88,100
| -84% | -$2.54M |
|
3473
PUT
Levi Strauss
LEVI
$9.72B
| $472K | ﹤0.01% |
34,800
+7,400
| +27% | +$103K |
|
3474
CALL
Reliance Steel & Aluminium
RS
$21B
| $472K | ﹤0.01% |
1,800
-9,600
| -84% | -$2.66M |
|
3475
CALL
Cabot Corp
CBT
$4.73B
| $471K | ﹤0.01% |
6,800
+2,200
| +48% | +$153K |
|
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.