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 | |
|---|---|---|---|---|---|---|
3476
CALL
Remitly
RELY
$4.83B
| $471K | ﹤0.01% |
18,700
+2,900
| +18% | +$65.4K |
|
|
ENV
3477
CALL
DELISTED
ENVESTNET, INC.
ENV
| $471K | ﹤0.01% |
+10,700
| New | +$588K |
|
3478
CALL
Bit Digital
BTBT
$452M
| $470K | ﹤0.01% |
219,800
-54,500
| -20% | -$171K |
|
3479
Establishment Labs
ESTA
$2.77B
| $470K | ﹤0.01% |
+9,596
| New | +$574K |
|
3480
CALL
Flowers Foods
FLO
$1.66B
| $470K | ﹤0.01% |
21,200
+19,300
| +1,016% | +$462K |
|
3481
CALL
Denison Mines
DNN
$2.5B
| $469K | ﹤0.01% |
284,800
+43,700
| +18% | +$60.5K |
|
3482
CALL
GXO Logistics
GXO
$6.16B
| $469K | ﹤0.01% |
8,000
+200
| +3% | +$12.5K |
|
3483
CALL
Lear
LEA
$7.48B
| $469K | ﹤0.01% |
3,500
-2,200
| -39% | -$318K |
|
|
ZYXI
3484
PUT
DELISTED
Zynex
ZYXI
| $468K | ﹤0.01% |
58,600
+45,600
| +351% | +$382K |
|
3485
Allegro MicroSystems
ALGM
$8.08B
| $467K | ﹤0.01% |
14,623
+3,690
| +34% | +$150K |
|
3486
CALL
United States Copper Index Fund
CPER
$743M
| $467K | ﹤0.01% |
20,300
-2,700
| -12% | -$63.2K |
|
3487
CALL
Telus
TU
$16.7B
| $467K | ﹤0.01% |
28,600
+24,100
| +536% | +$425K |
|
|
JWN
3488
DELISTED
Nordstrom
JWN
| $466K | ﹤0.01% |
31,199
-55,834
| -64% | -$1.02M |
|
|
CUK
3489
CALL
DELISTED
Carnival PLC
CUK
| $465K | ﹤0.01% |
38,000
+25,500
| +204% | +$382K |
|
3490
CALL
Zeta Global
ZETA
$5.28B
| $465K | ﹤0.01% |
55,700
+8,300
| +18% | +$68.5K |
|
3491
CALL
Brighthouse Financial
BHF
$3.68B
| $464K | ﹤0.01% |
9,500
+8,300
| +692% | +$412K |
|
3492
CALL
Natera
NTRA
$36.3B
| $464K | ﹤0.01% |
10,500
+8,600
| +453% | +$439K |
|
|
CMBT
3493
CALL
CMB.TECH NV
CMBT
$4.47B
| $464K | ﹤0.01% |
28,300
+28,000
| +9,333% | +$461K |
|
3494
PUT
Ethan Allen Interiors
ETD
$610M
| $463K | ﹤0.01% |
15,500
+1,500
| +11% | +$46.4K |
|
3495
PUT
Ameresco
AMRC
$1.02B
| $462K | ﹤0.01% |
12,000
+2,800
| +30% | +$135K |
|
3496
HF Sinclair
DINO
$16.1B
| $462K | ﹤0.01% |
8,121
+6,442
| +384% | +$350K |
|
3497
dLocal
DLO
$4.42B
| $462K | ﹤0.01% |
24,146
-556
| -2% | -$9.46K |
|
|
SBOW
3498
CALL
DELISTED
SilverBow Resources, Inc.
SBOW
| $461K | ﹤0.01% |
12,900
+5,000
| +63% | +$182K |
|
|
ITOS
3499
PUT
DELISTED
iTeos Therapeutics
ITOS
| $460K | ﹤0.01% |
42,100
+40,600
| +2,707% | +$519K |
|
3500
PUT
Magnolia Oil & Gas
MGY
$5.68B
| $460K | ﹤0.01% |
20,100
+1,300
| +7% | +$29K |
|
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.