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 | |
|---|---|---|---|---|---|---|
3601
PUT
Metropolitan Bank Holding Corp
MCB
$1.14B
| $413K | ﹤0.01% |
11,400
-74,500
| -87% | -$3.05M |
|
3602
CALL
Viasat
VSAT
$10.1B
| $413K | ﹤0.01% |
22,400
+9,900
| +79% | +$283K |
|
3603
Amylyx Pharmaceuticals
AMLX
$2.17B
| $412K | ﹤0.01% |
22,552
-20,503
| -48% | -$434K |
|
3604
PUT
Invesco CurrencyShares Canadian Dollar Trust
FXC
$72.7M
| $411K | ﹤0.01% |
5,700
-14,600
| -72% | -$1.06M |
|
3605
NETGEAR
NTGR
$663M
| $411K | ﹤0.01% |
32,679
+30,247
| +1,244% | +$401K |
|
3606
CALL
Brunswick
BC
$5.33B
| $410K | ﹤0.01% |
5,200
-2,600
| -33% | -$214K |
|
|
VISN
3607
CALL
Vistance Networks Inc
VISN
$2.67B
| $409K | ﹤0.01% |
121,800
+87,400
| +254% | +$358K |
|
3608
Carriage Services
CSV
$648M
| $409K | ﹤0.01% |
14,492
-24,649
| -63% | -$777K |
|
3609
CALL
DocGo
DCGO
$62.4M
| $408K | ﹤0.01% |
76,700
+48,200
| +169% | +$391K |
|
3610
Entergy
ETR
$52.4B
| $408K | ﹤0.01% |
+8,828
| New | +$431K |
|
|
BLUE
3611
CALL
DELISTED
bluebird bio
BLUE
| $407K | ﹤0.01% |
6,885
+5,075
| +280% | +$356K |
|
3612
Flowserve
FLS
$9.38B
| $406K | ﹤0.01% |
10,224
-6,815
| -40% | -$263K |
|
3613
PUT
HighPeak Energy
HPK
$811M
| $406K | ﹤0.01% |
24,100
+17,700
| +277% | +$257K |
|
|
HUYA
3614
Huya Inc
HUYA
$561M
| $406K | ﹤0.01% |
143,276
+91,437
| +176% | +$264K |
|
3615
Realty Income
O
$61.3B
| $406K | ﹤0.01% |
8,139
-7,356
| -47% | -$423K |
|
3616
PUT
Ubiquiti
UI
$32.4B
| $406K | ﹤0.01% |
2,800
-2,400
| -46% | -$403K |
|
3617
PUT
1-800-Flowers.com
FLWS
$254M
| $405K | ﹤0.01% |
57,900
+44,500
| +332% | +$334K |
|
3618
CALL
BRC Group Holdings
RILY
$270M
| $405K | ﹤0.01% |
9,900
-3,100
| -24% | -$153K |
|
3619
Companhia Siderúrgica Nacional
SID
$1.46B
| $404K | ﹤0.01% |
+169,171
| New | +$433K |
|
3620
Trump Media & Technology Group
DJT
$2.74B
| $404K | ﹤0.01% |
24,659
-22,130
| -47% | -$345K |
|
3621
CALL
Clean Energy Fuels
CLNE
$421M
| $403K | ﹤0.01% |
105,300
-48,000
| -31% | -$214K |
|
3622
PUT
G-III Apparel Group
GIII
$1.55B
| $403K | ﹤0.01% |
16,200
-9,800
| -38% | -$209K |
|
3623
CALL
Heron Therapeutics
HRTX
$92M
| $402K | ﹤0.01% |
+391,000
| New | +$556K |
|
3624
PUT
Howmet Aerospace
HWM
$114B
| $402K | ﹤0.01% |
8,700
-6,300
| -42% | -$307K |
|
3625
PUT
indie Semiconductor
INDI
$678M
| $402K | ﹤0.01% |
63,900
-18,900
| -23% | -$146K |
|
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.