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 | |
|---|---|---|---|---|---|---|
5676
CALL
Horizon Technology Finance
HRZN
$295M
| $57K | ﹤0.01% |
4,800
-6,800
| -59% | -$83.4K |
|
|
LSEA
5677
DELISTED
Landsea Homes
LSEA
| $57K | ﹤0.01% |
+6,376
| New | +$63.9K |
|
5678
CALL
MACOM Technology Solutions
MTSI
$19.2B
| $57K | ﹤0.01% |
700
-24,000
| -97% | -$1.78M |
|
5679
NextNav
NN
$1.79B
| $57K | ﹤0.01% |
+11,284
| New | +$45.5K |
|
5680
CALL
Navitas Semiconductor
NVTS
$2.84B
| $57K | ﹤0.01% |
8,300
+3,600
| +77% | +$31.9K |
|
5681
PUT
Ribbon Communications
RBBN
$377M
| $57K | ﹤0.01% |
21,300
-100
| -0.5% | -$292 |
|
5682
Sabre
SABR
$731M
| $57K | ﹤0.01% |
+12,750
| New | +$57.9K |
|
5683
PUT
Southside Bancshares
SBSI
$967M
| $57K | ﹤0.01% |
+2,000
| New | +$59.6K |
|
|
SPTN
5684
PUT
DELISTED
SpartanNash
SPTN
| $57K | ﹤0.01% |
2,600
+1,100
| +73% | +$24.3K |
|
5685
CALL
TherapeuticsMD
TXMD
$23.5M
| $57K | ﹤0.01% |
19,000
+100
| +0.5% | +$378 |
|
5686
PUT
Vitesse Energy
VTS
$651M
| $57K | ﹤0.01% |
2,500
+1,700
| +213% | +$39.9K |
|
5687
Vanguard Russell 2000 ETF
VTWO
$17.3B
| $57K | ﹤0.01% |
804
-1,910
| -70% | -$145K |
|
|
MRNS
5688
PUT
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $57K | ﹤0.01% |
7,100
-4,600
| -39% | -$38.3K |
|
|
TCN
5689
CALL
DELISTED
Tricon Residential Inc.
TCN
| $57K | ﹤0.01% |
7,800
+6,300
| +420% | +$54.3K |
|
|
LUNA
5690
CALL
DELISTED
Luna Innovations Incorporated
LUNA
| $57K | ﹤0.01% |
9,800
-13,100
| -57% | -$99.2K |
|
5691
CALL
Alector
ALEC
$168M
| $56K | ﹤0.01% |
8,700
+3,900
| +81% | +$25.2K |
|
5692
PUT
InfraCap MLP ETF
AMZA
$470M
| $56K | ﹤0.01% |
2,200
-3,200
| -59% | -$110K |
|
5693
Booz Allen Hamilton
BAH
$8.39B
| $56K | ﹤0.01% |
521
+140
| +37% | +$16.1K |
|
5694
CALL
Cytek Biosciences
CTKB
$545M
| $56K | ﹤0.01% |
10,200
-37,900
| -79% | -$304K |
|
5695
1-800-Flowers.com
FLWS
$250M
| $56K | ﹤0.01% |
8,057
+4,443
| +123% | +$33.4K |
|
5696
CALL
Fortis
FTS
$29B
| $56K | ﹤0.01% |
1,500
-600
| -29% | -$24.5K |
|
|
IMMP
5697
CALL
Immutep
IMMP
$56.3M
| $56K | ﹤0.01% |
29,700
+13,000
| +78% | +$26.4K |
|
5698
CALL
Bank of N.T. Butterfield & Son
NTB
$2.43B
| $56K | ﹤0.01% |
2,100
+1,900
| +950% | +$55.3K |
|
|
OLO
5699
CALL
DELISTED
Olo Inc
OLO
| $56K | ﹤0.01% |
9,400
+9,000
| +2,250% | +$58.8K |
|
5700
PAR Technology
PAR
$699M
| $56K | ﹤0.01% |
+1,462
| New | +$55.3K |
|
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.