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 | |
|---|---|---|---|---|---|---|
3551
PUT
Onto Innovation
ONTO
$13B
| $518K | ﹤0.01% |
2,500
+700
| +39% | +$141K |
|
3552
ProShares UltraShort QQQ
QID
$288M
| $517K | ﹤0.01% |
14,300
+5,482
| +62% | +$215K |
|
3553
CALL
Yext
YEXT
$554M
| $517K | ﹤0.01% |
74,800
-4,700
| -6% | -$26.1K |
|
3554
CALL
Alphatec Holdings
ATEC
$1.33B
| $516K | ﹤0.01% |
92,900
+30,600
| +49% | +$235K |
|
|
BRFS
3555
CALL
DELISTED
BRF SA
BRFS
| $516K | ﹤0.01% |
118,200
+103,300
| +693% | +$437K |
|
3556
CALL
OGE Energy
OGE
$10.2B
| $516K | ﹤0.01% |
12,600
+5,500
| +77% | +$213K |
|
3557
CALL
Energy Fuels
UUUU
$2.93B
| $516K | ﹤0.01% |
94,000
-78,800
| -46% | -$410K |
|
|
SGI
3558
Somnigroup International
SGI
$15.3B
| $516K | ﹤0.01% |
9,463
-68,877
| -88% | -$3.5M |
|
3559
CALL
Principal Financial Group
PFG
$24B
| $515K | ﹤0.01% |
6,000
-4,500
| -43% | -$363K |
|
3560
dLocal
DLO
$4.4B
| $514K | ﹤0.01% |
64,303
-6,630
| -9% | -$53.7K |
|
3561
CALL
EverQuote
EVER
$929M
| $514K | ﹤0.01% |
24,400
-20,100
| -45% | -$459K |
|
3562
Honeywell
HON
$77.9B
| $514K | ﹤0.01% |
2,642
-2,240
| -46% | -$434K |
|
3563
PUT
LegalZoom.com
LZ
$1.3B
| $514K | ﹤0.01% |
81,100
-27,800
| -26% | -$182K |
|
|
OPI
3564
PUT
DELISTED
Office Properties Income Trust
OPI
| $514K | ﹤0.01% |
236,000
+165,300
| +234% | +$375K |
|
3565
Tronox
TROX
$973M
| $514K | ﹤0.01% |
+35,174
| New | +$501K |
|
3566
PUT
Woodward
WWD
$25B
| $514K | ﹤0.01% |
3,000
+1,900
| +173% | +$316K |
|
3567
iShares MSCI Australia ETF
EWA
$1.37B
| $513K | ﹤0.01% |
+18,930
| New | +$479K |
|
3568
CALL
RadNet
RDNT
$4.84B
| $513K | ﹤0.01% |
7,400
-6,200
| -46% | -$391K |
|
3569
CALL
Appian
APPN
$1.88B
| $512K | ﹤0.01% |
15,000
+8,400
| +127% | +$272K |
|
3570
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$161M
| $512K | ﹤0.01% |
10,325
-9,123
| -47% | -$446K |
|
3571
CALL
Perimeter Solutions
PRM
$5.44B
| $511K | ﹤0.01% |
38,000
+35,800
| +1,627% | +$371K |
|
3572
Sportradar
SRAD
$4.34B
| $510K | ﹤0.01% |
42,132
+17,217
| +69% | +$197K |
|
|
QXO
3573
PUT
QXO Inc
QXO
$14.7B
| $510K | ﹤0.01% |
+32,400
| New | +$945K |
|
3574
Gaotu Techedu
GOTU
$374M
| $509K | ﹤0.01% |
129,849
+82,154
| +172% | +$336K |
|
|
DFTX
3575
CALL
Definium Therapeutics
DFTX
$5.66B
| $509K | ﹤0.01% |
89,500
+35,700
| +66% | +$248K |
|
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.