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 | |
|---|---|---|---|---|---|---|
626
AbbVie
ABBV
$452B
| $18.5M | 0.01% |
124,252
+69,611
| +127% | +$10.2M |
|
627
CALL
Alcoa
AA
$12B
| $18.5M | 0.01% |
636,300
+280,500
| +79% | +$8.79M |
|
628
Alphabet (Google) Class A
GOOGL
$3.88T
| $18.4M | 0.01% |
140,996
+88,276
| +167% | +$11.4M |
|
629
CALL
ProShares UltraShort Health Care
RXD
$3.33M
| $18.4M | 0.01% |
519,500
-131,950
| -20% | -$3.31M |
|
|
SGEN
630
PUT
DELISTED
Seagen Inc. Common Stock
SGEN
| $18.3M | 0.01% |
86,400
+53,500
| +163% | +$10.7M |
|
631
PUT
Idexx Laboratories
IDXX
$42.6B
| $18.3M | 0.01% |
41,900
+32,900
| +366% | +$16.4M |
|
632
CALL
Boston Scientific
BSX
$64.1B
| $18.3M | 0.01% |
346,800
-27,400
| -7% | -$1.44M |
|
633
CALL
Toronto Dominion Bank
TD
$197B
| $18.3M | 0.01% |
303,100
+3,800
| +1% | +$237K |
|
634
PUT
DuPont de Nemours
DD
$18.6B
| $18.2M | 0.01% |
194,227
+60,068
| +45% | +$5.64M |
|
635
CALL
Seagate
STX
$209B
| $18.1M | 0.01% |
274,100
-10,200
| -4% | -$657K |
|
636
CALL
Novartis
NVS
$293B
| $18M | 0.01% |
177,200
-177,500
| -50% | -$18M |
|
637
Nike
NKE
$61.1B
| $18M | 0.01% |
188,394
+90,336
| +92% | +$9.29M |
|
638
CALL
Futu Holdings
FUTU
$14.1B
| $18M | 0.01% |
311,400
+31,800
| +11% | +$1.7M |
|
639
CALL
HP
HPQ
$22.9B
| $18M | 0.01% |
700,400
+356,800
| +104% | +$10.9M |
|
640
PUT
American Tower
AMT
$77.9B
| $18M | 0.01% |
109,400
+68,900
| +170% | +$12.6M |
|
641
CALL
HubSpot
HUBS
$10.1B
| $17.9M | 0.01% |
36,400
-2,100
| -5% | -$1.1M |
|
642
CALL
Generac Holdings
GNRC
$12.6B
| $17.8M | 0.01% |
163,500
+8,100
| +5% | +$1M |
|
643
CALL
Moody's
MCO
$82.9B
| $17.8M | 0.01% |
56,200
+38,800
| +223% | +$13.2M |
|
644
Sea Limited
SE
$62.7B
| $17.7M | 0.01% |
403,313
+381,230
| +1,726% | +$18.6M |
|
645
CALL
CME Group
CME
$91.6B
| $17.7M | 0.01% |
88,500
+24,100
| +37% | +$4.79M |
|
646
PUT
LyondellBasell Industries
LYB
$20.4B
| $17.7M | 0.01% |
187,000
+95,000
| +103% | +$9.13M |
|
647
NIO
NIO
$11.7B
| $17.7M | 0.01% |
1,956,782
+1,277,047
| +188% | +$14.2M |
|
648
PUT
Snap
SNAP
$7.28B
| $17.7M | 0.01% |
1,984,900
-2,170,600
| -52% | -$22.7M |
|
649
CALL
Western Digital
WDC
$192B
| $17.7M | 0.01% |
512,133
+50,803
| +11% | +$1.6M |
|
650
CALL
MGM Resorts International
MGM
$11.5B
| $17.6M | 0.01% |
477,900
+195,300
| +69% | +$8.63M |
|
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.