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 | |
|---|---|---|---|---|---|---|
5376
CALL
Strategic Education
STRA
$1.85B
| $101K | ﹤0.01% |
1,100
-12,000
| -92% | -$1.04M |
|
5377
iShares MSCI ACWI ETF
ACWI
$32.9B
| $100K | ﹤0.01% |
+986
| New | +$94.3K |
|
|
CVSA
5378
PUT
Covista Inc
CVSA
$4.25B
| $100K | ﹤0.01% |
1,700
-600
| -26% | -$32K |
|
5379
Bitwise Crypto Industry Innovators ETF
BITQ
$379M
| $100K | ﹤0.01% |
8,708
+1,497
| +21% | +$12.3K |
|
|
BRFS
5380
CALL
DELISTED
BRF SA
BRFS
| $100K | ﹤0.01% |
36,300
+34,400
| +1,811% | +$86.1K |
|
5381
PUT
Emergent Biosolutions
EBS
$373M
| $100K | ﹤0.01% |
42,000
+21,800
| +108% | +$51.2K |
|
|
GAMB
5382
CALL
DELISTED
Gambling.com
GAMB
| $100K | ﹤0.01% |
10,300
+7,400
| +255% | +$86.1K |
|
5383
CALL
HNI Corp
HNI
$3.24B
| $100K | ﹤0.01% |
2,400
+2,000
| +500% | +$76.1K |
|
5384
PUT
PAR Technology
PAR
$699M
| $100K | ﹤0.01% |
2,300
-300
| -12% | -$11.3K |
|
|
PPSI
5385
Pioneer Power Solutions
PPSI
$32.3M
| $100K | ﹤0.01% |
14,755
-20,114
| -58% | -$119K |
|
5386
CALL
Protagonist Therapeutics
PTGX
$8.79B
| $100K | ﹤0.01% |
4,400
-1,900
| -30% | -$33.2K |
|
5387
RingCentral
RNG
$4.66B
| $100K | ﹤0.01% |
+2,972
| New | +$88.8K |
|
5388
PUT
Root
ROOT
$857M
| $100K | ﹤0.01% |
17,900
+6,500
| +57% | +$64.5K |
|
5389
CALL
RXO
RXO
$3.34B
| $100K | ﹤0.01% |
4,300
-13,400
| -76% | -$270K |
|
5390
Veeco
VECO
$3.05B
| $100K | ﹤0.01% |
3,240
-16,680
| -84% | -$465K |
|
|
AEL
5391
CALL
DELISTED
American Equity Investment Life Holding Company
AEL
| $100K | ﹤0.01% |
1,800
-1,000
| -36% | -$54.4K |
|
|
AEL
5392
PUT
DELISTED
American Equity Investment Life Holding Company
AEL
| $100K | ﹤0.01% |
1,800
-4,700
| -72% | -$255K |
|
5393
Applied Industrial Technologies
AIT
$12.8B
| $99K | ﹤0.01% |
+575
| New | +$93.1K |
|
|
ARBK
5394
PUT
Argo Blockchain
ARBK
$41.9M
| $99K | ﹤0.01% |
124
+34
| +38% | +$11K |
|
5395
Caribou Biosciences
CRBU
$145M
| $99K | ﹤0.01% |
17,313
+12,691
| +275% | +$62.7K |
|
5396
Amplify CWP Enhanced Dividend Income ETF
DIVO
$7.5B
| $99K | ﹤0.01% |
+2,722
| New | +$95.8K |
|
5397
CALL
Viant Technology
DSP
$236M
| $99K | ﹤0.01% |
14,400
-30,800
| -68% | -$185K |
|
5398
CALL
DTE Energy
DTE
$29.5B
| $99K | ﹤0.01% |
900
+700
| +350% | +$71.7K |
|
5399
PUT
Liberty Global Class C
LBTYK
$3.53B
| $99K | ﹤0.01% |
5,400
-29,800
| -85% | -$516K |
|
5400
PUT
Ligand Pharmaceuticals
LGND
$5.76B
| $99K | ﹤0.01% |
+1,400
| New | +$82.6K |
|
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.