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 | |
|---|---|---|---|---|---|---|
3376
PUT
Trex
TREX
$4.57B
| $511K | ﹤0.01% |
8,300
+100
| +1% | +$6.86K |
|
3377
CALL
Evercore
EVR
$13.2B
| $510K | ﹤0.01% |
3,700
+3,600
| +3,600% | +$489K |
|
3378
CALL
FuelCell Energy
FCEL
$1.72B
| $510K | ﹤0.01% |
13,287
+784
| +6% | +$40.9K |
|
3379
PUT
Hartford Financial Services
HIG
$38.4B
| $510K | ﹤0.01% |
7,200
-2,000
| -22% | -$145K |
|
3380
PUT
Royal Gold
RGLD
$17.1B
| $510K | ﹤0.01% |
4,800
+200
| +4% | +$22.7K |
|
3381
Revvity
RVTY
$12.1B
| $510K | ﹤0.01% |
+4,613
| New | +$542K |
|
|
WIRE
3382
PUT
DELISTED
Encore Wire Corp
WIRE
| $510K | ﹤0.01% |
2,800
-200
| -7% | -$33.9K |
|
3383
Brunswick
BC
$5.24B
| $509K | ﹤0.01% |
+6,444
| New | +$531K |
|
3384
PUT
Amplify Junior Silver Miners ETF
SILJ
$3.29B
| $508K | ﹤0.01% |
84,100
+20,200
| +32% | +$191K |
|
3385
CALL
Fidelity National Financial
FNF
$14B
| $507K | ﹤0.01% |
12,300
-28,700
| -70% | -$1.15M |
|
|
AVID
3386
PUT
DELISTED
Avid Technology Inc
AVID
| $507K | ﹤0.01% |
18,900
+13,700
| +263% | +$360K |
|
3387
Costamare
CMRE
$1.89B
| $506K | ﹤0.01% |
52,669
+32,253
| +158% | +$329K |
|
3388
PUT
VeriSign
VRSN
$24.8B
| $506K | ﹤0.01% |
2,500
+300
| +14% | +$62.3K |
|
3389
CALL
Iridium Communications
IRDM
$4.87B
| $504K | ﹤0.01% |
11,100
-3,200
| -22% | -$166K |
|
3390
PUT
Verra Mobility
VRRM
$636M
| $504K | ﹤0.01% |
27,000
+22,400
| +487% | +$434K |
|
|
SII
3391
Sprott
SII
$2.7B
| $503K | ﹤0.01% |
16,513
+15,451
| +1,455% | +$508K |
|
3392
PUT
Woodside Energy
WDS
$41.4B
| $503K | ﹤0.01% |
21,600
-400
| -2% | -$9.74K |
|
3393
Ameren
AEE
$31B
| $502K | ﹤0.01% |
+6,720
| New | +$548K |
|
3394
CALL
Amplitude
AMPL
$1.15B
| $502K | ﹤0.01% |
43,400
+5,400
| +14% | +$62.5K |
|
3395
PUT
Exelon
EXC
$48.2B
| $502K | ﹤0.01% |
13,300
-1,900
| -13% | -$77.4K |
|
3396
CALL
Radian Group
RDN
$5.18B
| $502K | ﹤0.01% |
20,000
-7,600
| -28% | -$201K |
|
3397
CALL
Alamo Group
ALG
$2B
| $501K | ﹤0.01% |
+2,900
| New | +$520K |
|
3398
Grab
GRAB
$13.7B
| $501K | ﹤0.01% |
141,620
+112,581
| +388% | +$402K |
|
3399
PUT
Flywire
FLYW
$1.99B
| $500K | ﹤0.01% |
15,700
-1,100
| -7% | -$35.2K |
|
3400
PUT
Synaptics
SYNA
$4.55B
| $500K | ﹤0.01% |
5,600
-5,900
| -51% | -$518K |
|
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.