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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3201
CALL
Grocery Outlet
GO
$930M
| $742K | ﹤0.01% |
42,300
+2,000
| +5% | +$37.8K |
|
3202
PUT
iRhythm Holdings
IRTC
$3.75B
| $742K | ﹤0.01% |
10,000
+900
| +10% | +$71.7K |
|
3203
TG Therapeutics
TGTX
$8.53B
| $742K | ﹤0.01% |
31,759
-116,349
| -79% | -$2.54M |
|
|
CRON
3204
PUT
Cronos Group
CRON
$1.06B
| $741K | ﹤0.01% |
338,500
-195,400
| -37% | -$447K |
|
3205
PUT
Silicon Motion
SIMO
$8.28B
| $741K | ﹤0.01% |
12,200
-16,400
| -57% | -$1.08M |
|
3206
PUT
Magnite
MGNI
$2.77B
| $740K | ﹤0.01% |
53,500
-47,000
| -47% | -$640K |
|
3207
PUT
New York Times
NYT
$11.9B
| $740K | ﹤0.01% |
13,300
-1,600
| -11% | -$86.1K |
|
3208
Vera Bradley
VRA
$107M
| $740K | ﹤0.01% |
135,685
+135,222
| +29,206% | +$799K |
|
|
METD
3209
PUT
Direxion Daily META Bear 1X ETF
METD
$8.5M
| $740K | ﹤0.01% |
14,600
+3,800
| +35% | +$87.5K |
|
3210
CALL
Harmony Gold Mining
HMY
$9.9B
| $739K | ﹤0.01% |
72,700
+9,700
| +15% | +$94.6K |
|
3211
PUT
MKS Inc
MKSI
$20.6B
| $739K | ﹤0.01% |
6,800
-4,700
| -41% | -$558K |
|
|
SWTX
3212
DELISTED
SpringWorks Therapeutics
SWTX
| $739K | ﹤0.01% |
23,074
+1,981
| +9% | +$74K |
|
3213
Sibanye-Stillwater
SBSW
$6.04B
| $738K | ﹤0.01% |
179,646
-279,857
| -61% | -$1.19M |
|
3214
PUT
Uranium Energy
UEC
$4.88B
| $738K | ﹤0.01% |
119,000
-18,400
| -13% | -$99.8K |
|
3215
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.16B
| $737K | ﹤0.01% |
7,100
+3,000
| +73% | +$194K |
|
3216
Biohaven
BHVN
$2.2B
| $736K | ﹤0.01% |
+14,737
| New | +$573K |
|
3217
CALL
Legacy Housing
LEGH
$634M
| $735K | ﹤0.01% |
26,900
-43,400
| -62% | -$1.14M |
|
3218
Aspen Aerogels
ASPN
$387M
| $733K | ﹤0.01% |
26,481
-7,493
| -22% | -$187K |
|
3219
CALL
Crane Co
CR
$13B
| $728K | ﹤0.01% |
4,600
+200
| +5% | +$30.1K |
|
3220
CALL
BRC Group Holdings
RILY
$271M
| $728K | ﹤0.01% |
138,700
+96,800
| +231% | +$1.07M |
|
3221
Community Health Systems
CYH
$390M
| $727K | ﹤0.01% |
119,913
-18,803
| -14% | -$92.2K |
|
3222
PUT
Energy Fuels
UUUU
$2.9B
| $727K | ﹤0.01% |
132,600
+58,600
| +79% | +$305K |
|
|
WOW
3223
CALL
DELISTED
WideOpenWest
WOW
| $727K | ﹤0.01% |
138,500
+109,900
| +384% | +$586K |
|
3224
CALL
Delek Logistics
DKL
$3.04B
| $725K | ﹤0.01% |
16,600
+12,500
| +305% | +$511K |
|
3225
CALL
Fox Class B
FOX
$21.7B
| $725K | ﹤0.01% |
17,600
-268,800
| -94% | -$9.69M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.