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 | |
|---|---|---|---|---|---|---|
5276
Littelfuse
LFUS
$11.3B
| $83K | ﹤0.01% |
+336
| New | +$91K |
|
5277
Pitney Bowes
PBI
$2.43B
| $83K | ﹤0.01% |
27,638
-6,977
| -20% | -$23.9K |
|
5278
Outdoor Holding Co
POWW
$250M
| $83K | ﹤0.01% |
41,360
-25,866
| -38% | -$54.3K |
|
5279
CALL
LiveRamp
RAMP
$2.3B
| $83K | ﹤0.01% |
2,900
+2,500
| +625% | +$73.8K |
|
|
RGLS
5280
CALL
DELISTED
Regulus Therapeutics
RGLS
| $83K | ﹤0.01% |
60,200
+5,100
| +9% | +$7.39K |
|
5281
RCI Hospitality Holdings
RICK
$200M
| $83K | ﹤0.01% |
1,384
-1,818
| -57% | -$122K |
|
5282
CALL
SK Telecom
SKM
$12.1B
| $83K | ﹤0.01% |
+3,900
| New | +$78.1K |
|
|
IRD
5283
CALL
Opus Genetics
IRD
$308M
| $83K | ﹤0.01% |
25,000
-3,800
| -13% | -$15.3K |
|
|
ATSG
5284
DELISTED
Air Transport Services Group
ATSG
| $83K | ﹤0.01% |
+4,008
| New | +$83.5K |
|
|
CIR
5285
PUT
DELISTED
CIRCOR International, Inc
CIR
| $83K | ﹤0.01% |
1,500
-500
| -25% | -$27.9K |
|
5286
Biomea Fusion
BMEA
$88.2M
| $82K | ﹤0.01% |
+6,001
| New | +$108K |
|
5287
iShares International Select Dividend ETF
IDV
$8.39B
| $82K | ﹤0.01% |
3,264
+2,263
| +226% | +$60K |
|
|
ADAM
5288
CALL
Adamas Trust
ADAM
$835M
| $82K | ﹤0.01% |
9,700
| – | – |
|
5289
Prosperity Bancshares
PB
$9.01B
| $82K | ﹤0.01% |
1,510
-197
| -12% | -$11.4K |
|
5290
Park Hotels & Resorts
PK
$3.06B
| $82K | ﹤0.01% |
6,727
+4,999
| +289% | +$64.6K |
|
5291
PUT
UDR
UDR
$12.2B
| $82K | ﹤0.01% |
2,300
-2,600
| -53% | -$104K |
|
5292
Veracyte
VCYT
$3.64B
| $82K | ﹤0.01% |
3,677
+2,842
| +340% | +$73.1K |
|
|
SEI
5293
PUT
Solaris Energy Infrastructure
SEI
$3.26B
| $82K | ﹤0.01% |
7,700
-100
| -1% | -$1.02K |
|
|
QVCGA
5294
DELISTED
QVC Group Inc Series A
QVCGA
| $82K | ﹤0.01% |
2,734
-554
| -17% | -$23.4K |
|
|
CMLS
5295
DELISTED
Cumulus Media Inc. Class A Common Stock
CMLS
| $82K | ﹤0.01% |
16,112
-12,860
| -44% | -$61K |
|
|
MDRX
5296
DELISTED
Veradigm Inc. Common Stock
MDRX
| $82K | ﹤0.01% |
6,296
+3,269
| +108% | +$42.9K |
|
5297
PUT
Arcturus Therapeutics
ARCT
$168M
| $81K | ﹤0.01% |
3,200
-4,500
| -58% | -$139K |
|
|
CCRN
5298
CALL
DELISTED
Cross Country Healthcare
CCRN
| $81K | ﹤0.01% |
3,300
-2,400
| -42% | -$60.4K |
|
5299
PUT
Clarus
CLAR
$123M
| $81K | ﹤0.01% |
10,800
+7,200
| +200% | +$57.7K |
|
5300
PUT
Cellebrite
CLBT
$3.67B
| $81K | ﹤0.01% |
10,700
-3,100
| -22% | -$23.3K |
|
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.