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 | |
|---|---|---|---|---|---|---|
3451
PagerDuty
PD
$753M
| $635K | ﹤0.01% |
27,450
+24,919
| +985% | +$539K |
|
3452
Arcos Dorados Holdings
ARCO
$1.75B
| $634K | ﹤0.01% |
+50,025
| New | +$536K |
|
3453
Okta
OKTA
$23.9B
| $633K | ﹤0.01% |
+6,997
| New | +$534K |
|
3454
ProShares Ultra Semiconductors
USD
$2.48B
| $633K | ﹤0.01% |
46,580
+6,744
| +17% | +$73.6K |
|
3455
CALL
AvePoint
AVPT
$2.72B
| $632K | ﹤0.01% |
77,100
-1,800
| -2% | -$14.1K |
|
3456
Cipher Digital
CIFR
$8.86B
| $632K | ﹤0.01% |
153,207
+28,538
| +23% | +$86.9K |
|
3457
Molina Healthcare
MOH
$10.4B
| $631K | ﹤0.01% |
1,747
+230
| +15% | +$81.1K |
|
3458
New Fortress Energy
NFE
$96.4M
| $631K | ﹤0.01% |
16,731
+14,620
| +693% | +$504K |
|
3459
CALL
AAR Corp
AIR
$5.46B
| $630K | ﹤0.01% |
10,100
+8,300
| +461% | +$533K |
|
3460
CALL
Asbury Automotive
ABG
$4.22B
| $629K | ﹤0.01% |
2,800
-32,800
| -92% | -$6.93M |
|
3461
PUT
Algoma Steel
ASTL
$463M
| $629K | ﹤0.01% |
62,800
-57,400
| -48% | -$444K |
|
3462
Moody's
MCO
$84.2B
| $629K | ﹤0.01% |
1,612
+264
| +20% | +$91.8K |
|
|
FIRY
3463
PUT
Firy Inc
FIRY
$130M
| $629K | ﹤0.01% |
100,900
-5,300
| -5% | -$29.6K |
|
3464
CALL
Atossa Therapeutics
ATOS
$23.5M
| $627K | ﹤0.01% |
47,520
-573
| -1% | -$6.18K |
|
3465
CALL
Pembina Pipeline
PBA
$29B
| $626K | ﹤0.01% |
18,200
+9,900
| +119% | +$317K |
|
3466
Plug Power
PLUG
$2.87B
| $625K | ﹤0.01% |
138,895
+32,492
| +31% | +$170K |
|
3467
PUT
Ero Copper
ERO
$2.73B
| $623K | ﹤0.01% |
39,500
+38,300
| +3,192% | +$538K |
|
3468
CALL
Schneider National
SNDR
$6.44B
| $623K | ﹤0.01% |
24,500
+24,300
| +12,150% | +$600K |
|
3469
Wheaton Precious Metals
WPM
$50.9B
| $623K | ﹤0.01% |
12,636
-21,386
| -63% | -$968K |
|
3470
CALL
Fidelity National Financial
FNF
$14B
| $622K | ﹤0.01% |
12,200
-100
| -0.8% | -$4.35K |
|
3471
PUT
Teradata
TDC
$2.8B
| $622K | ﹤0.01% |
14,300
+10,200
| +249% | +$459K |
|
3472
Coca-Cola Europacific Partners
CCEP
$48.1B
| $621K | ﹤0.01% |
9,317
+7,597
| +442% | +$465K |
|
|
KLG
3473
CALL
DELISTED
WK Kellogg Co
KLG
| $621K | ﹤0.01% |
+47,300
| New | +$532K |
|
3474
CALL
Nabors Industries
NBR
$1.16B
| $620K | ﹤0.01% |
7,600
-3,600
| -32% | -$349K |
|
|
COOP
3475
DELISTED
Mr. Cooper
COOP
| $617K | ﹤0.01% |
9,488
-6,964
| -42% | -$412K |
|
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.