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 | |
|---|---|---|---|---|---|---|
3001
CALL
RPM International
RPM
$13.8B
| $730K | ﹤0.01% |
7,700
+3,100
| +67% | +$302K |
|
3002
PUT
Vanguard Dividend Appreciation ETF
VIG
$111B
| $730K | ﹤0.01% |
4,700
+2,700
| +135% | +$438K |
|
|
BPMC
3003
CALL
DELISTED
Blueprint Medicines
BPMC
| $728K | ﹤0.01% |
14,500
+11,500
| +383% | +$615K |
|
3004
CALL
Freedom Holding
FRHC
$9.71B
| $728K | ﹤0.01% |
+8,600
| New | +$728K |
|
3005
PUT
SoundHound AI
SOUN
$2.77B
| $728K | ﹤0.01% |
362,200
+211,600
| +141% | +$538K |
|
|
MAG
3006
CALL
DELISTED
MAG Silver
MAG
| $726K | ﹤0.01% |
70,100
+14,300
| +26% | +$159K |
|
3007
Monolithic Power Systems
MPWR
$64.6B
| $726K | ﹤0.01% |
1,573
-3,378
| -68% | -$1.73M |
|
|
SYRS
3008
CALL
DELISTED
Syros Pharmaceuticals, Inc. Common Stock
SYRS
| $723K | ﹤0.01% |
183,100
+900
| +0.5% | +$3.37K |
|
|
TUZ
3009
CALL
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $723K | ﹤0.01% |
13,700
+10,000
| +270% | +$528K |
|
|
QLTB
3010
PUT
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $723K | ﹤0.01% |
10,800
+9,500
| +731% | +$636K |
|
3011
Skywest
SKYW
$4.32B
| $722K | ﹤0.01% |
+17,229
| New | +$723K |
|
3012
Direxion Daily Homebuilders & Supplies Bull 3X ETF
NAIL
$592M
| $721K | ﹤0.01% |
13,139
+9,005
| +218% | +$654K |
|
3013
PUT
Assured Guaranty
AGO
$3.79B
| $720K | ﹤0.01% |
11,900
+6,000
| +102% | +$356K |
|
3014
CALL
NovoCure
NVCR
$2B
| $720K | ﹤0.01% |
44,600
-103,500
| -70% | -$2.98M |
|
3015
CALL
Vipshop
VIPS
$7.05B
| $720K | ﹤0.01% |
45,000
-15,500
| -26% | -$252K |
|
3016
CALL
Invesco CurrencyShares Australian Dollar Trust
FXA
$96.9M
| $719K | ﹤0.01% |
11,300
-200
| -2% | -$13K |
|
3017
PUT
Global E Online
GLBE
$6.38B
| $719K | ﹤0.01% |
18,100
-3,900
| -18% | -$157K |
|
3018
PUT
Healthcare Realty
HR
$7.5B
| $717K | ﹤0.01% |
47,000
+38,000
| +422% | +$674K |
|
3019
HighPeak Energy
HPK
$871M
| $716K | ﹤0.01% |
42,418
+35,151
| +484% | +$510K |
|
3020
CALL
Digital Turbine
APPS
$1.04B
| $715K | ﹤0.01% |
118,300
-50,200
| -30% | -$447K |
|
3021
CALL
Synaptics
SYNA
$4.44B
| $715K | ﹤0.01% |
8,000
+4,600
| +135% | +$404K |
|
3022
CALL
Tactile Systems Technology
TCMD
$626M
| $713K | ﹤0.01% |
50,800
+50,500
| +16,833% | +$988K |
|
3023
Fastly Inc
FSLY
$3.1B
| $712K | ﹤0.01% |
+37,174
| New | +$725K |
|
3024
CALL
Advanced Energy
AEIS
$11.4B
| $711K | ﹤0.01% |
6,900
+6,200
| +886% | +$694K |
|
3025
PUT
Ball Corp
BALL
$17.2B
| $711K | ﹤0.01% |
14,300
-25,300
| -64% | -$1.38M |
|
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.