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 | |
|---|---|---|---|---|---|---|
1276
PUT
Scotiabank
BNS
$106B
| $6.84M | ﹤0.01% |
125,500
-23,500
| -16% | -$1.14M |
|
1277
PUT
VeriSign
VRSN
$25.5B
| $6.84M | ﹤0.01% |
36,000
+4,400
| +14% | +$794K |
|
1278
PUT
LyondellBasell Industries
LYB
$19.5B
| $6.83M | ﹤0.01% |
71,200
-34,200
| -32% | -$3.28M |
|
1279
PUT
Papa John's
PZZA
$999M
| $6.79M | ﹤0.01% |
126,000
-33,600
| -21% | -$1.55M |
|
1280
CALL
Lumentum
LITE
$59.4B
| $6.78M | ﹤0.01% |
106,900
-78,000
| -42% | -$4.22M |
|
1281
PUT
First Majestic Silver
AG
$8.05B
| $6.77M | ﹤0.01% |
1,128,900
+24,000
| +2% | +$139K |
|
|
GAP
1282
CALL
The Gap Inc
GAP
$6.84B
| $6.77M | ﹤0.01% |
306,900
-575,600
| -65% | -$12.8M |
|
1283
CALL
Tyson Foods
TSN
$20.2B
| $6.75M | ﹤0.01% |
113,400
-82,200
| -42% | -$5.02M |
|
1284
PUT
ATI
ATI
$27B
| $6.74M | ﹤0.01% |
100,800
+40,600
| +67% | +$2.52M |
|
1285
CALL
Target Hospitality
TH
$1.61B
| $6.74M | ﹤0.01% |
866,400
+196,600
| +29% | +$1.84M |
|
1286
Lyft
LYFT
$5.39B
| $6.71M | ﹤0.01% |
+526,556
| New | +$6.29M |
|
1287
PUT
Alpha Metallurgical Resources
AMR
$1.82B
| $6.71M | ﹤0.01% |
28,400
-2,500
| -8% | -$639K |
|
1288
PUT
Celestica
CLS
$35.1B
| $6.71M | ﹤0.01% |
131,200
+14,000
| +12% | +$724K |
|
1289
PUT
Sweetgreen
SG
$713M
| $6.7M | ﹤0.01% |
189,000
-40,800
| -18% | -$1.24M |
|
1290
CALL
Inspire Medical Systems
INSP
$1.42B
| $6.69M | ﹤0.01% |
31,700
+21,200
| +202% | +$3.68M |
|
1291
CALL
Alexandria Real Estate Equities
ARE
$8.88B
| $6.68M | ﹤0.01% |
56,300
+45,800
| +436% | +$5.46M |
|
1292
CALL
Semtech
SMTC
$11.7B
| $6.68M | ﹤0.01% |
146,400
-147,000
| -50% | -$5.41M |
|
|
SPR
1293
CALL
DELISTED
Spirit AeroSystems
SPR
| $6.66M | ﹤0.01% |
205,000
-336,600
| -62% | -$11.5M |
|
1294
PUT
Public Storage
PSA
$60.2B
| $6.66M | ﹤0.01% |
18,300
+100
| +0.5% | +$32.5K |
|
|
ARCH
1295
CALL
DELISTED
Arch Resources, Inc.
ARCH
| $6.64M | ﹤0.01% |
48,100
-22,400
| -32% | -$3.09M |
|
1296
CALL
Regions Financial
RF
$26.3B
| $6.63M | ﹤0.01% |
284,200
+54,400
| +24% | +$1.19M |
|
1297
CALL
Freshpet
FRPT
$2.83B
| $6.62M | ﹤0.01% |
48,400
+3,900
| +9% | +$511K |
|
1298
CALL
Mine Safety
MSA
$6.74B
| $6.61M | ﹤0.01% |
37,300
+13,500
| +57% | +$2.45M |
|
|
CFLT
1299
CALL
DELISTED
Confluent
CFLT
| $6.61M | ﹤0.01% |
324,400
-119,700
| -27% | -$2.68M |
|
1300
PUT
Agilent Technologies
A
$39.1B
| $6.59M | ﹤0.01% |
44,400
-7,000
| -14% | -$958K |
|
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.