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 | |
|---|---|---|---|---|---|---|
|
VTNR
3426
DELISTED
Vertex Energy, Inc
VTNR
| $488K | ﹤0.01% |
109,683
+51,792
| +89% | +$266K |
|
3427
CALL
Loews
L
$24.8B
| $487K | ﹤0.01% |
7,700
-3,600
| -32% | -$224K |
|
3428
CALL
United States Gasoline Fund
UGA
$144M
| $487K | ﹤0.01% |
7,200
+4,900
| +213% | +$345K |
|
3429
PUT
Pagaya Technologies
PGY
$1.33B
| $486K | ﹤0.01% |
25,683
+6,766
| +36% | +$164K |
|
3430
CALL
Century Aluminum
CENX
$4.39B
| $485K | ﹤0.01% |
67,500
+7,900
| +13% | +$63.6K |
|
3431
WisdomTree Japan Hedged Equity Fund
DXJ
$7.1B
| $485K | ﹤0.01% |
5,502
+859
| +19% | +$73.2K |
|
3432
CALL
indie Semiconductor
INDI
$670M
| $485K | ﹤0.01% |
77,000
+12,100
| +19% | +$93.6K |
|
|
NUVL
3433
DELISTED
Nuvalent
NUVL
| $485K | ﹤0.01% |
+10,561
| New | +$469K |
|
3434
PUT
Virtu Financial
VIRT
$5.12B
| $485K | ﹤0.01% |
28,100
+23,400
| +498% | +$425K |
|
|
AMWD
3435
CALL
DELISTED
American Woodmark
AMWD
| $483K | ﹤0.01% |
6,400
+4,000
| +167% | +$301K |
|
3436
HEICO Corp
HEI
$50B
| $483K | ﹤0.01% |
+2,987
| New | +$507K |
|
3437
CALL
SIGA Technologies
SIGA
$219M
| $483K | ﹤0.01% |
92,000
+32,400
| +54% | +$160K |
|
|
LICY
3438
CALL
DELISTED
Li-Cycle Holdings Corp.
LICY
| $483K | ﹤0.01% |
17,013
+7,338
| +76% | +$293K |
|
3439
Sprouts Farmers Market
SFM
$7.31B
| $482K | ﹤0.01% |
11,268
+10,944
| +3,378% | +$429K |
|
|
DRRX
3440
CALL
DELISTED
DURECT Corp
DRRX
| $481K | ﹤0.01% |
193,500
+181,700
| +1,540% | +$619K |
|
3441
CALL
Gogo Inc
GOGO
$541M
| $481K | ﹤0.01% |
40,400
-34,100
| -46% | -$471K |
|
3442
PUT
LCI Industries
LCII
$2.6B
| $481K | ﹤0.01% |
4,100
+3,400
| +486% | +$426K |
|
|
RVNC
3443
PUT
DELISTED
Revance Therapeutics, Inc.
RVNC
| $481K | ﹤0.01% |
42,000
+25,700
| +158% | +$494K |
|
|
ACB
3444
CALL
Aurora Cannabis
ACB
$170M
| $480K | ﹤0.01% |
82,190
+12,550
| +18% | +$73K |
|
|
SA
3445
Seabridge Gold
SA
$2.68B
| $480K | ﹤0.01% |
45,592
+28,277
| +163% | +$335K |
|
3446
PUT
Talos Energy
TALO
$2.37B
| $480K | ﹤0.01% |
29,200
+17,600
| +152% | +$283K |
|
3447
Aldeyra Therapeutics
ALDX
$91.7M
| $478K | ﹤0.01% |
+71,639
| New | +$532K |
|
3448
CALL
Phathom Pharmaceuticals
PHAT
$964M
| $478K | ﹤0.01% |
46,100
+11,100
| +32% | +$152K |
|
|
SA
3449
PUT
Seabridge Gold
SA
$2.68B
| $478K | ﹤0.01% |
45,400
+34,500
| +317% | +$409K |
|
3450
CALL
Sprout Social
SPT
$521M
| $478K | ﹤0.01% |
9,600
-3,200
| -25% | -$160K |
|
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.