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 |
NVIDIA
NVDA
|
+$93M |
| 2 |
Citigroup
C
|
+$74.8M |
| 3 |
Pinduoduo
PDD
|
+$50.7M |
| 4 |
Intel
INTC
|
+$47.1M |
| 5 |
Broadcom
AVGO
|
+$46.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$94.5M |
| 2 |
Pfizer
PFE
|
+$66.4M |
| 3 |
Boeing
BA
|
+$61.6M |
| 4 |
PayPal
PYPL
|
+$42.2M |
| 5 |
GE Aerospace
GE
|
+$42M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.53% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.21% |
| 4 | Financials | 0.2% |
| 5 | Materials | 0.12% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6526
CALL
Amdocs
DOX
$6.03B
| $31K | ﹤0.01% |
400
-300
| -43% | -$24.7K |
|
6527
PUT
Expensify
EXFY
$174M
| $31K | ﹤0.01% |
21,200
+1,000
| +5% | +$1.58K |
|
6528
PUT
First Financial Bancorp
FFBC
$3.55B
| $31K | ﹤0.01% |
1,400
-3,200
| -70% | -$70.7K |
|
6529
PUT
Gevo
GEVO
$353M
| $31K | ﹤0.01% |
57,100
-900
| -2% | -$603 |
|
6530
PUT
Goldman Sachs BDC
GSBD
$997M
| $31K | ﹤0.01% |
2,100
| – | – |
|
6531
Goosehead Insurance
GSHD
$2.51B
| $31K | ﹤0.01% |
552
-221
| -29% | -$13.3K |
|
6532
PUT
Independence Realty Trust
IRT
$3.98B
| $31K | ﹤0.01% |
1,700
| – | – |
|
|
NXDR
6533
Nextdoor Holdings
NXDR
$885M
| $31K | ﹤0.01% |
+11,434
| New | +$26.4K |
|
6534
Lindblad Expeditions
LIND
$1.95B
| $31K | ﹤0.01% |
3,311
+935
| +39% | +$7.24K |
|
|
LUXE
6535
PUT
LuxExperience B.V.
LUXE
$1.13B
| $31K | ﹤0.01% |
6,200
+4,600
| +288% | +$21.1K |
|
6536
NewtekOne
NEWT
$426M
| $31K | ﹤0.01% |
+2,519
| New | +$31K |
|
|
NINE
6537
CALL
DELISTED
Nine Energy Service
NINE
| $31K | ﹤0.01% |
18,600
+17,400
| +1,450% | +$35.2K |
|
6538
CALL
PDS Biotechnology
PDSB
$37.4M
| $31K | ﹤0.01% |
10,700
-800
| -7% | -$2.56K |
|
6539
PUT
PetMed Express
PETS
$42.3M
| $31K | ﹤0.01% |
7,700
+2,900
| +60% | +$12.4K |
|
6540
CALL
Quanterix
QTRX
$159M
| $31K | ﹤0.01% |
2,400
-4,900
| -67% | -$81.9K |
|
6541
PUT
Resideo Technologies
REZI
$5.4B
| $31K | ﹤0.01% |
1,600
+800
| +100% | +$16.6K |
|
6542
PUT
Rayonier
RYN
$6.67B
| $31K | ﹤0.01% |
+1,212
| New | +$33.3K |
|
6543
PUT
Tronox
TROX
$967M
| $31K | ﹤0.01% |
2,000
+200
| +11% | +$3.64K |
|
6544
PUT
TTEC Holdings
TTEC
$124M
| $31K | ﹤0.01% |
5,400
-900
| -14% | -$6.59K |
|
6545
PUT
Vuzix
VUZI
$178M
| $31K | ﹤0.01% |
23,700
-42,700
| -64% | -$58.8K |
|
6546
Voyager Therapeutics
VYGR
$181M
| $31K | ﹤0.01% |
3,972
-7,639
| -66% | -$64K |
|
6547
PUT
Weis Markets
WMK
$1.92B
| $31K | ﹤0.01% |
500
| – | – |
|
|
BCOV
6548
DELISTED
Brightcove, Inc.
BCOV
| $31K | ﹤0.01% |
+13,140
| New | +$25.8K |
|
|
GRTS
6549
CALL
DELISTED
Gritstone bio, Inc. Common Stock
GRTS
| $31K | ﹤0.01% |
51,300
-92,200
| -64% | -$77.9K |
|
|
KNGS
6550
PUT
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $31K | ﹤0.01% |
+700
| New | +$19.4K |
|
Similar funds
Simplex Trading's Q2 2024 Portfolio in Review
As of Q2 2024, Simplex Trading held 10,213 positions worth $162B, down 6.5% from $173B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading withdrew a net $19.2B in Q2 2024, closing 1,431 positions and reducing 4,061 holdings. Its most notable exit was Boeing, an estimated $61.6M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.53% of assets, up from 0.38% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Citigroup worth $77M.
- Simplex Trading's largest Q2 2024 buy was Citigroup: 1,213,247 shares worth $77M.
- Simplex Trading added most to NVIDIA in Q2 2024, an estimated $93M increase.
- Simplex Trading's biggest Q2 2024 reduction was State Street Energy Select Sector SPDR ETF, cutting an estimated $94.5M.
- Simplex Trading fully exited Boeing in Q2 2024, selling an estimated $61.6M.
- Simplex Trading's ten largest holdings make up 50% of its $162B portfolio in Q2 2024.
- Simplex Trading opened 1,358 new positions and closed 1,431 in Q2 2024.
- Simplex Trading's portfolio value fell 6.5% quarter-over-quarter to $162B.
Based on Simplex Trading's 13F filing for Q2 2024, filed 25 Jul 2024.