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 | |
|---|---|---|---|---|---|---|
|
BCYC
3151
Bicycle Therapeutics
BCYC
$276M
| $633K | ﹤0.01% |
31,534
-34,909
| -53% | -$798K |
|
3152
PUT
Genco Shipping & Trading
GNK
$1.09B
| $633K | ﹤0.01% |
45,300
+600
| +1% | +$8.27K |
|
3153
International Flavors & Fragrances
IFF
$19.5B
| $633K | ﹤0.01% |
+9,296
| New | +$679K |
|
3154
Ardelyx
ARDX
$1.25B
| $632K | ﹤0.01% |
154,971
+58,031
| +60% | +$226K |
|
3155
Autohome
ATHM
$2.46B
| $632K | ﹤0.01% |
20,839
+16,916
| +431% | +$509K |
|
3156
PUT
Edison International
EIX
$30.3B
| $632K | ﹤0.01% |
10,000
-2,500
| -20% | -$174K |
|
3157
CALL
United Therapeutics
UTHR
$26.3B
| $632K | ﹤0.01% |
2,800
-800
| -22% | -$184K |
|
3158
PUT
Emcor
EME
$33B
| $631K | ﹤0.01% |
+3,000
| New | +$628K |
|
|
SQSP
3159
CALL
DELISTED
Squarespace, Inc.
SQSP
| $631K | ﹤0.01% |
21,800
-18,100
| -45% | -$555K |
|
|
SII
3160
PUT
Sprott
SII
$2.7B
| $630K | ﹤0.01% |
20,700
+19,900
| +2,488% | +$654K |
|
3161
CALL
Towne Bank
TOWN
$3.45B
| $630K | ﹤0.01% |
27,500
+27,200
| +9,067% | +$655K |
|
3162
ARK Autonomous Technology & Robotics ETF
ARKQ
$1.9B
| $629K | ﹤0.01% |
11,992
+8,307
| +225% | +$458K |
|
3163
CALL
Matsons
MATX
$6.22B
| $629K | ﹤0.01% |
7,100
+4,800
| +209% | +$419K |
|
3164
PUT
A.O. Smith
AOS
$8.61B
| $628K | ﹤0.01% |
9,500
+7,700
| +428% | +$547K |
|
3165
PUT
Flex
FLEX
$42.5B
| $628K | ﹤0.01% |
30,919
-42,995
| -58% | -$871K |
|
3166
CALL
Golar LNG
GLNG
$4.99B
| $628K | ﹤0.01% |
25,900
-500
| -2% | -$11.5K |
|
3167
CALL
NeoGenomics
NEO
$1.71B
| $626K | ﹤0.01% |
50,900
-14,600
| -22% | -$217K |
|
3168
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $626K | ﹤0.01% |
12,900
+1,600
| +14% | +$77K |
|
3169
PUT
Sociedad Química y Minera de Chile
SQM
$19.6B
| $626K | ﹤0.01% |
10,500
-17,100
| -62% | -$1.15M |
|
3170
CALL
Magnolia Oil & Gas
MGY
$5.53B
| $625K | ﹤0.01% |
27,300
+16,500
| +153% | +$369K |
|
3171
Rocket Lab Corp
RKLB
$41.8B
| $623K | ﹤0.01% |
142,424
+25,717
| +22% | +$156K |
|
3172
CALL
Travere Therapeutics
TVTX
$5.27B
| $623K | ﹤0.01% |
69,700
+66,200
| +1,891% | +$934K |
|
3173
State Street Technology Select Sector SPDR ETF
XLK
$114B
| $621K | ﹤0.01% |
7,580
+4,380
| +137% | +$376K |
|
3174
PUT
BigBear.ai
BBAI
$1.36B
| $618K | ﹤0.01% |
409,600
-96,900
| -19% | -$168K |
|
3175
Valvoline
VVV
$5.05B
| $618K | ﹤0.01% |
19,181
+10,950
| +133% | +$385K |
|
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.