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 | |
|---|---|---|---|---|---|---|
5301
INmune Bio
INMB
$45.7M
| $81K | ﹤0.01% |
12,089
+9,299
| +333% | +$77.1K |
|
|
JFIN
5302
CALL
Jiayin Group
JFIN
$114M
| $81K | ﹤0.01% |
15,100
+2,900
| +24% | +$16.5K |
|
5303
Lindsay Corp
LNN
$1.13B
| $81K | ﹤0.01% |
696
+679
| +3,994% | +$83.9K |
|
5304
PUT
D-Wave Quantum Inc. Common Stock
QBTS
$6.68B
| $81K | ﹤0.01% |
84,100
+10,200
| +14% | +$16.3K |
|
5305
PUT
Teledyne Technologies
TDY
$30.4B
| $81K | ﹤0.01% |
200
-1,200
| -86% | -$487K |
|
5306
CALL
Zurn Elkay Water Solutions
ZWS
$8.35B
| $81K | ﹤0.01% |
+2,900
| New | +$82.9K |
|
|
SUM
5307
DELISTED
Summit Materials, Inc. Class A Common Stock
SUM
| $81K | ﹤0.01% |
2,625
-158
| -6% | -$5.62K |
|
5308
PUT
Amprius Technologies
AMPX
$1.33B
| $80K | ﹤0.01% |
16,900
-6,000
| -26% | -$35.3K |
|
5309
CALL
2x Bitcoin ETF
BITX
$858M
| $80K | ﹤0.01% |
+7,600
| New | +$93K |
|
5310
CALL
Clarus
CLAR
$123M
| $80K | ﹤0.01% |
10,600
+4,700
| +80% | +$37.7K |
|
|
HIMX
5311
CALL
Himax Technologies
HIMX
$2.17B
| $80K | ﹤0.01% |
13,700
+9,200
| +204% | +$59K |
|
5312
Harmonic Inc
HLIT
$1.24B
| $80K | ﹤0.01% |
8,396
+7,931
| +1,706% | +$94.6K |
|
5313
CALL
Phreesia
PHR
$652M
| $80K | ﹤0.01% |
4,300
-3,300
| -43% | -$88.8K |
|
|
PNNT
5314
CALL
Pennant Park Investment Corp
PNNT
$215M
| $80K | ﹤0.01% |
12,200
+7,500
| +160% | +$48.6K |
|
|
SHCO
5315
DELISTED
Soho House & Co
SHCO
| $80K | ﹤0.01% |
11,629
+8,971
| +338% | +$57.6K |
|
5316
PUT
Timken Company
TKR
$9.5B
| $80K | ﹤0.01% |
1,100
+900
| +450% | +$73K |
|
|
TMHC
5317
CALL
DELISTED
Taylor Morrison
TMHC
| $80K | ﹤0.01% |
1,900
-2,100
| -53% | -$98.8K |
|
5318
Verra Mobility
VRRM
$772M
| $80K | ﹤0.01% |
+4,307
| New | +$83.5K |
|
|
ESMT
5319
PUT
DELISTED
EngageSmart, Inc.
ESMT
| $80K | ﹤0.01% |
4,500
+4,400
| +4,400% | +$78.5K |
|
5320
PUT
Alarm.com
ALRM
$2.68B
| $79K | ﹤0.01% |
1,300
+800
| +160% | +$45.2K |
|
|
GOLD
5321
PUT
Gold.com Inc
GOLD
$1.19B
| $79K | ﹤0.01% |
2,700
+200
| +8% | +$7.22K |
|
5322
Axalta
AXTA
$7.66B
| $79K | ﹤0.01% |
2,957
-1,412
| -32% | -$41.4K |
|
5323
CALL
Brookfield Infrastructure Partners
BIP
$19.2B
| $79K | ﹤0.01% |
2,700
-5,600
| -67% | -$185K |
|
5324
Vanguard Total Bond Market
BND
$157B
| $79K | ﹤0.01% |
+1,142
| New | +$81.5K |
|
5325
PUT
Barnes & Noble Education
BNED
$429M
| $79K | ﹤0.01% |
725
+615
| +559% | +$83.2K |
|
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.