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 | |
|---|---|---|---|---|---|---|
3026
Invesco DB Base Metals Fund
DBB
$308M
| $710K | ﹤0.01% |
+37,062
| New | +$681K |
|
3027
CALL
PTC Therapeutics
PTCT
$6.29B
| $710K | ﹤0.01% |
31,700
+15,600
| +97% | +$580K |
|
|
LSXMK
3028
DELISTED
Liberty Media Corporation Series C Liberty SiriusXM Common Stock
LSXMK
| $710K | ﹤0.01% |
27,926
+24,608
| +742% | +$598K |
|
3029
Q2 Holdings
QTWO
$3.64B
| $709K | ﹤0.01% |
+21,977
| New | +$728K |
|
3030
CALL
IQVIA
IQV
$35.6B
| $708K | ﹤0.01% |
3,600
-9,700
| -73% | -$2.11M |
|
3031
PUT
The RealReal
REAL
$1.4B
| $708K | ﹤0.01% |
335,600
+316,200
| +1,630% | +$771K |
|
3032
Herbalife
HLF
$1.26B
| $706K | ﹤0.01% |
50,508
+35,334
| +233% | +$534K |
|
3033
CALL
Evolv Technologies
EVLV
$980M
| $705K | ﹤0.01% |
145,100
-25,900
| -15% | -$160K |
|
3034
Ross Stores
ROST
$78.1B
| $705K | ﹤0.01% |
+6,245
| New | +$716K |
|
3035
CALL
Vaalco Energy
EGY
$552M
| $702K | ﹤0.01% |
160,100
-49,300
| -24% | -$214K |
|
|
HUYA
3036
PUT
Huya Inc
HUYA
$558M
| $702K | ﹤0.01% |
247,300
+199,400
| +416% | +$575K |
|
3037
PUT
Atkore
ATKR
$2.54B
| $701K | ﹤0.01% |
4,700
+3,900
| +488% | +$589K |
|
|
HAPN
3038
PUT
Happen Inc
HAPN
$2.16B
| $700K | ﹤0.01% |
114,800
+87,900
| +327% | +$683K |
|
3039
Mativ Holdings
MATV
$455M
| $700K | ﹤0.01% |
49,124
+48,086
| +4,633% | +$769K |
|
3040
PUT
Halozyme
HALO
$9.66B
| $699K | ﹤0.01% |
18,300
+11,400
| +165% | +$467K |
|
3041
PUT
Repligen
RGEN
$7.39B
| $699K | ﹤0.01% |
4,400
-3,300
| -43% | -$539K |
|
3042
CALL
Hamilton Lane
HLNE
$3.83B
| $696K | ﹤0.01% |
7,700
+5,100
| +196% | +$454K |
|
3043
PUT
iShares Gold Trust
IAU
$63.4B
| $696K | ﹤0.01% |
19,900
+800
| +4% | +$29.2K |
|
3044
Perrigo
PRGO
$1.4B
| $693K | ﹤0.01% |
21,720
+9,789
| +82% | +$345K |
|
3045
CALL
MKS Inc
MKSI
$21.3B
| $692K | ﹤0.01% |
8,000
+3,800
| +90% | +$371K |
|
|
MACK
3046
CALL
DELISTED
Merrimack Pharmaceuticals, Inc.
MACK
| $692K | ﹤0.01% |
56,200
+40,200
| +251% | +$487K |
|
3047
CALL
Eldorado Gold
EGO
$8.48B
| $691K | ﹤0.01% |
77,600
+35,700
| +85% | +$348K |
|
3048
CALL
Globus Medical
GMED
$10.6B
| $690K | ﹤0.01% |
13,900
+9,700
| +231% | +$542K |
|
3049
Eagle Materials
EXP
$6.69B
| $687K | ﹤0.01% |
+4,130
| New | +$750K |
|
3050
Lightspeed Commerce
LSPD
$1.35B
| $687K | ﹤0.01% |
48,970
+5,171
| +12% | +$83.6K |
|
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.