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 | |
|---|---|---|---|---|---|---|
5526
PUT
iShares S&P GSCI Commodity-Indexed Trust
GSG
$998M
| $73K | ﹤0.01% |
3,500
-4,600
| -57% | -$97.5K |
|
5527
PUT
Ryan Specialty Holdings
RYAN
$5.72B
| $73K | ﹤0.01% |
1,100
+500
| +83% | +$31.2K |
|
5528
CALL
Standex International
SXI
$3.59B
| $73K | ﹤0.01% |
400
-1,000
| -71% | -$174K |
|
5529
CALL
Takeda Pharmaceutical
TAK
$54.6B
| $73K | ﹤0.01% |
5,200
+2,600
| +100% | +$36.9K |
|
|
LUCK
5530
CALL
Lucky Strike Entertainment
LUCK
$914M
| $73K | ﹤0.01% |
6,300
-32,600
| -84% | -$396K |
|
5531
PUT
Bally's
BALY
$682M
| $72K | ﹤0.01% |
4,200
+800
| +24% | +$12.8K |
|
5532
Camden Property Trust
CPT
$11B
| $72K | ﹤0.01% |
585
-238
| -29% | -$28.1K |
|
|
CSGS
5533
PUT
DELISTED
CSG Systems International
CSGS
| $72K | ﹤0.01% |
1,500
-2,300
| -61% | -$105K |
|
5534
PUT
CryoPort
CYRX
$761M
| $72K | ﹤0.01% |
9,000
+4,000
| +80% | +$32.7K |
|
5535
CALL
Haemonetics
HAE
$3.89B
| $72K | ﹤0.01% |
900
-7,800
| -90% | -$630K |
|
5536
CALL
Kennametal
KMT
$2.59B
| $72K | ﹤0.01% |
2,800
-3,200
| -53% | -$79.6K |
|
5537
PUT
MediWound
MDWD
$181M
| $72K | ﹤0.01% |
4,000
+2,200
| +122% | +$40.2K |
|
|
NINE
5538
DELISTED
Nine Energy Service
NINE
| $72K | ﹤0.01% |
64,239
-60,420
| -48% | -$86.1K |
|
5539
Omeros
OMER
$857M
| $72K | ﹤0.01% |
18,144
-15,929
| -47% | -$68K |
|
5540
PUT
QuidelOrtho
QDEL
$1.14B
| $72K | ﹤0.01% |
1,600
-11,500
| -88% | -$465K |
|
|
SEMR
5541
DELISTED
Semrush
SEMR
| $72K | ﹤0.01% |
4,645
-1,958
| -30% | -$27.3K |
|
5542
SiteOne Landscape Supply
SITE
$4.12B
| $72K | ﹤0.01% |
+481
| New | +$65.9K |
|
5543
PUT
Cambria Tail Risk ETF
TAIL
$147M
| $72K | ﹤0.01% |
1,000
-1,200
| -55% | -$14.4K |
|
5544
GraniteShares 2x Long MSFT Daily ETF
MSFL
$169M
| $72K | ﹤0.01% |
2,892
+2,822
| +4,031% | +$70.7K |
|
5545
CALL
AAR Corp
AIR
$5.59B
| $71K | ﹤0.01% |
1,100
-7,500
| -87% | -$496K |
|
5546
CALL
Barrett Business Services
BBSI
$959M
| $71K | ﹤0.01% |
+1,900
| New | +$66.9K |
|
5547
FuelCell Energy
FCEL
$1.73B
| $71K | ﹤0.01% |
6,314
+393
| +7% | +$5.82K |
|
5548
CALL
GrowGeneration
GRWG
$86.5M
| $71K | ﹤0.01% |
33,500
-74,700
| -69% | -$160K |
|
5549
PUT
Lightwave Logic
LWLG
$995M
| $71K | ﹤0.01% |
25,900
+800
| +3% | +$2.4K |
|
5550
PUT
Q2 Holdings
QTWO
$3.8B
| $71K | ﹤0.01% |
900
-600
| -40% | -$42.3K |
|
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.