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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
BDN
5576
PUT
Brandywine Realty Trust
BDN
$524M
| $82K | ﹤0.01% |
15,300
-4,500
| -23% | -$19.7K |
|
5577
Celsius Holdings
CELH
$7.47B
| $82K | ﹤0.01% |
+1,519
| New | +$81.1K |
|
5578
PUT
DNOW Inc
DNOW
$2.58B
| $82K | ﹤0.01% |
7,300
+5,500
| +306% | +$60.3K |
|
5579
PUT
Fidus Investment
FDUS
$749M
| $82K | ﹤0.01% |
4,200
+3,700
| +740% | +$70.6K |
|
5580
PUT
Monte Rosa Therapeutics
GLUE
$1.4B
| $82K | ﹤0.01% |
+14,600
| New | +$57.3K |
|
5581
CALL
iShares S&P GSCI Commodity-Indexed Trust
GSG
$998M
| $82K | ﹤0.01% |
4,100
+3,200
| +356% | +$67.4K |
|
5582
CALL
IAMGOLD
IAG
$8.2B
| $82K | ﹤0.01% |
32,600
-27,600
| -46% | -$66.1K |
|
5583
KLX Energy Services
KLXE
$45M
| $82K | ﹤0.01% |
7,351
+805
| +12% | +$8.15K |
|
5584
PUT
Lindblad Expeditions
LIND
$1.94B
| $82K | ﹤0.01% |
7,300
+7,000
| +2,333% | +$54.2K |
|
5585
Lexicon Pharmaceuticals
LXRX
$1.03B
| $82K | ﹤0.01% |
+54,248
| New | +$64.5K |
|
|
NOAH
5586
Noah Holdings
NOAH
$580M
| $82K | ﹤0.01% |
5,967
+5,869
| +5,989% | +$74.2K |
|
|
OLPX
5587
DELISTED
Olaplex Holdings
OLPX
| $82K | ﹤0.01% |
32,473
+31,713
| +4,173% | +$62.6K |
|
|
PNNT
5588
CALL
Pennant Park Investment Corp
PNNT
$215M
| $82K | ﹤0.01% |
12,000
-200
| -2% | -$1.29K |
|
5589
PUT
UroGen Pharma
URGN
$1.86B
| $82K | ﹤0.01% |
5,500
-1,400
| -20% | -$18.2K |
|
5590
Viavi Solutions
VIAV
$9.12B
| $82K | ﹤0.01% |
8,182
+8,136
| +17,687% | +$68.3K |
|
|
HTLF
5591
PUT
DELISTED
Heartland Financial USA, Inc.
HTLF
| $82K | ﹤0.01% |
2,200
+700
| +47% | +$22.1K |
|
|
MRSN
5592
PUT
DELISTED
Mersana Therapeutics
MRSN
| $81K | ﹤0.01% |
+1,404
| New | +$56.5K |
|
5593
PUT
MSC Industrial Direct
MSM
$6.89B
| $81K | ﹤0.01% |
800
-19,200
| -96% | -$1.9M |
|
5594
PUT
Richardson Electronics
RELL
$267M
| $81K | ﹤0.01% |
6,100
+2,000
| +49% | +$23.9K |
|
5595
CALL
RPC Inc
RES
$1.24B
| $81K | ﹤0.01% |
11,200
+700
| +7% | +$5.48K |
|
5596
Sabesp
SBS
$19.1B
| $81K | ﹤0.01% |
27,701
+16,749
| +153% | +$42.5K |
|
5597
Universal Technical Institute
UTI
$2.16B
| $81K | ﹤0.01% |
+6,544
| New | +$66.4K |
|
5598
Vishay Intertechnology
VSH
$5.25B
| $81K | ﹤0.01% |
+3,412
| New | +$79.1K |
|
|
TGR
5599
CALL
DELISTED
ISHARES TARGET DATE RETIREMENT INCOME ETF
TGR
| $81K | ﹤0.01% |
2,700
-13,300
| -83% | -$399K |
|
5600
AMN Healthcare
AMN
$1.3B
| $80K | ﹤0.01% |
1,074
-157
| -13% | -$11.2K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.