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 | |
|---|---|---|---|---|---|---|
3226
CALL
Mirum Pharmaceuticals
MIRM
$6.94B
| $725K | ﹤0.01% |
18,600
+2,100
| +13% | +$83.8K |
|
3227
CALL
Blink Charging
BLNK
$78.3M
| $721K | ﹤0.01% |
419,200
-119,700
| -22% | -$286K |
|
3228
CALL
Limbach Holdings
LMB
$868M
| $719K | ﹤0.01% |
9,500
+8,500
| +850% | +$541K |
|
3229
CALL
Moelis & Co
MC
$5.01B
| $719K | ﹤0.01% |
10,500
+6,000
| +133% | +$387K |
|
3230
CALL
PubMatic
PUBM
$600M
| $719K | ﹤0.01% |
48,400
-15,100
| -24% | -$262K |
|
3231
Eos Energy Enterprises
EOSE
$1.26B
| $718K | ﹤0.01% |
241,879
+177,220
| +274% | +$375K |
|
3232
CALL
Power Integrations
POWI
$3.43B
| $718K | ﹤0.01% |
11,200
+6,300
| +129% | +$416K |
|
3233
Frontline
FRO
$8.61B
| $716K | ﹤0.01% |
31,355
+13,976
| +80% | +$329K |
|
3234
CALL
Aldeyra Therapeutics
ALDX
$93.5M
| $714K | ﹤0.01% |
132,600
+30,600
| +30% | +$146K |
|
3235
PUT
Park Hotels & Resorts
PK
$3.04B
| $714K | ﹤0.01% |
50,700
+400
| +0.8% | +$5.82K |
|
3236
Praxis Precision Medicines
PRAX
$8.96B
| $714K | ﹤0.01% |
12,418
+10,857
| +696% | +$586K |
|
|
DAWN
3237
PUT
DELISTED
Day One Biopharmaceuticals
DAWN
| $713K | ﹤0.01% |
51,200
-1,100
| -2% | -$15.7K |
|
3238
PUT
Natural Resource Partners
NRP
$1.3B
| $713K | ﹤0.01% |
7,300
-1,100
| -13% | -$100K |
|
|
GRFS
3239
Grifois
GRFS
$5.28B
| $711K | ﹤0.01% |
80,082
-207,270
| -72% | -$1.69M |
|
3240
Humacyte
HUMA
$180M
| $711K | ﹤0.01% |
130,707
+61,690
| +89% | +$407K |
|
3241
PUT
Geron
GERN
$949M
| $710K | ﹤0.01% |
156,600
-125,300
| -44% | -$570K |
|
3242
CALL
Polestar Automotive Holding UK
PSNY
$2.08B
| $708K | ﹤0.01% |
13,740
+7,727
| +129% | +$250K |
|
3243
PUT
Treace Medical Concepts
TMCI
$267M
| $708K | ﹤0.01% |
122,200
+700
| +0.6% | +$4.5K |
|
3244
CALL
Corsair Gaming
CRSR
$1.09B
| $707K | ﹤0.01% |
101,600
-9,300
| -8% | -$69.5K |
|
3245
ACM Research
ACMR
$5.47B
| $706K | ﹤0.01% |
34,826
-15,439
| -31% | -$296K |
|
3246
Black Stone Minerals
BSM
$3.18B
| $706K | ﹤0.01% |
46,813
+23,107
| +97% | +$346K |
|
3247
PUT
Viasat
VSAT
$10.2B
| $706K | ﹤0.01% |
59,200
-45,000
| -43% | -$726K |
|
3248
PUT
Fulcrum Therapeutics
FULC
$251M
| $705K | ﹤0.01% |
197,500
+194,000
| +5,543% | +$1.44M |
|
3249
PUT
Kanzhun
BZ
$6.99B
| $704K | ﹤0.01% |
40,600
-10,700
| -21% | -$156K |
|
3250
PUT
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $704K | ﹤0.01% |
5,200
-34,300
| -87% | -$2.19M |
|
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.