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 | |
|---|---|---|---|---|---|---|
3351
CALL
Kimco Realty
KIM
$17.8B
| $626K | ﹤0.01% |
27,000
+4,400
| +19% | +$97.1K |
|
|
SQSP
3352
CALL
DELISTED
Squarespace, Inc.
SQSP
| $626K | ﹤0.01% |
13,500
-16,800
| -55% | -$753K |
|
3353
PUT
Archer Aviation
ACHR
$3.78B
| $624K | ﹤0.01% |
206,000
-216,800
| -51% | -$828K |
|
3354
Charles River Laboratories
CRL
$10.8B
| $624K | ﹤0.01% |
+3,169
| New | +$659K |
|
3355
CALL
Burford Capital
BUR
$922M
| $623K | ﹤0.01% |
47,000
+9,900
| +27% | +$131K |
|
3356
CALL
Open Text
OTEX
$5.73B
| $622K | ﹤0.01% |
18,700
-17,000
| -48% | -$535K |
|
3357
CALL
Vista Energy
VIST
$7.42B
| $622K | ﹤0.01% |
14,100
-13,400
| -49% | -$629K |
|
3358
PUT
dLocal
DLO
$4.4B
| $621K | ﹤0.01% |
77,700
-8,800
| -10% | -$71.3K |
|
3359
CALL
Main Street Capital
MAIN
$5B
| $621K | ﹤0.01% |
12,400
-6,900
| -36% | -$345K |
|
3360
PUT
Powell Industries
POWL
$7.99B
| $621K | ﹤0.01% |
8,400
+2,100
| +33% | +$114K |
|
3361
PUT
Arthur J. Gallagher & Co
AJG
$65.1B
| $619K | ﹤0.01% |
2,200
-3,400
| -61% | -$959K |
|
3362
PUT
Innovative Industrial Properties
IIPR
$1.78B
| $619K | ﹤0.01% |
4,600
-12,700
| -73% | -$1.55M |
|
3363
CALL
Schrodinger
SDGR
$1.14B
| $619K | ﹤0.01% |
33,400
+12,300
| +58% | +$253K |
|
3364
Repligen
RGEN
$7.39B
| $618K | ﹤0.01% |
4,157
-2,864
| -41% | -$411K |
|
3365
PUT
Allegiant Air
ALGT
$2.66B
| $616K | ﹤0.01% |
11,200
+1,800
| +19% | +$81.1K |
|
3366
CALL
Paysafe
PSFE
$440M
| $616K | ﹤0.01% |
27,500
-17,000
| -38% | -$353K |
|
3367
TORM
TRMD
$3.05B
| $616K | ﹤0.01% |
+18,017
| New | +$661K |
|
3368
CALL
Danaos Corp
DAC
$2.55B
| $615K | ﹤0.01% |
7,100
-6,500
| -48% | -$543K |
|
|
SWTX
3369
PUT
DELISTED
SpringWorks Therapeutics
SWTX
| $615K | ﹤0.01% |
19,200
| – | – |
|
3370
DTE Energy
DTE
$30.6B
| $614K | ﹤0.01% |
+4,785
| New | +$577K |
|
3371
CALL
FTI Consulting
FCN
$4.88B
| $614K | ﹤0.01% |
2,700
-200
| -7% | -$44.4K |
|
3372
Ramaco Resources Class A
METC
$664M
| $614K | ﹤0.01% |
54,245
+21,268
| +64% | +$254K |
|
3373
PUT
Chord Energy
CHRD
$7.42B
| $612K | ﹤0.01% |
4,700
-15,900
| -77% | -$2.44M |
|
3374
CALL
Comtech Telecommunications
CMTL
$54.5M
| $612K | ﹤0.01% |
127,300
+120,700
| +1,829% | +$395K |
|
|
TEN
3375
PUT
Tsakos Energy Navigation Ltd
TEN
$1.18B
| $612K | ﹤0.01% |
24,400
-32,800
| -57% | -$833K |
|
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.