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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3376
W.W. Grainger
GWW
$66B
| $575K | ﹤0.01% |
546
+105
| +24% | +$118K |
|
3377
CALL
Surgery Partners
SGRY
$1.98B
| $575K | ﹤0.01% |
27,200
+23,800
| +700% | +$625K |
|
3378
Birkenstock
BIRK
$7.64B
| $574K | ﹤0.01% |
+10,134
| New | +$514K |
|
3379
PUT
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $574K | ﹤0.01% |
10,100
-31,700
| -76% | -$1.58M |
|
|
ANSS
3380
PUT
DELISTED
Ansys
ANSS
| $573K | ﹤0.01% |
1,700
-1,000
| -37% | -$335K |
|
3381
PUT
Fox Class B
FOX
$21.3B
| $573K | ﹤0.01% |
11,800
-87,200
| -88% | -$3.67M |
|
3382
PUT
SLM Corp
SLM
$4.78B
| $573K | ﹤0.01% |
20,800
+400
| +2% | +$9.89K |
|
3383
PUT
Allot
ALLT
$373M
| $572K | ﹤0.01% |
96,200
-39,800
| -29% | -$161K |
|
3384
CALL
Badger Meter
BMI
$3.71B
| $572K | ﹤0.01% |
2,700
+600
| +29% | +$131K |
|
3385
HF Sinclair
DINO
$16.4B
| $571K | ﹤0.01% |
16,293
+4,191
| +35% | +$171K |
|
3386
PUT
Manulife Financial
MFC
$73.2B
| $571K | ﹤0.01% |
18,600
-800
| -4% | -$24.8K |
|
3387
CALL
Apple Hospitality REIT
APLE
$3.98B
| $569K | ﹤0.01% |
37,100
-36,700
| -50% | -$569K |
|
3388
CALL
SES AI
SES
$205M
| $569K | ﹤0.01% |
+260,000
| New | +$148K |
|
3389
Jackson Financial
JXN
$8.44B
| $568K | ﹤0.01% |
6,528
+2,419
| +59% | +$236K |
|
3390
CALL
Curtiss-Wright
CW
$27.5B
| $567K | ﹤0.01% |
1,600
+500
| +45% | +$180K |
|
3391
CALL
Fidelity National Financial
FNF
$14B
| $567K | ﹤0.01% |
10,100
+5,100
| +102% | +$307K |
|
3392
Global X Silver Miners ETF NEW
SIL
$4.09B
| $566K | ﹤0.01% |
17,818
-20,457
| -53% | -$751K |
|
3393
CALL
TransUnion
TRU
$14.9B
| $565K | ﹤0.01% |
6,100
-8,200
| -57% | -$831K |
|
3394
PUT
Harmony Gold Mining
HMY
$9.92B
| $564K | ﹤0.01% |
68,700
-96,800
| -58% | -$940K |
|
3395
Inspire Medical Systems
INSP
$1.47B
| $563K | ﹤0.01% |
+3,039
| New | +$590K |
|
|
NNDM
3396
CALL
Nano Dimension
NNDM
$312M
| $563K | ﹤0.01% |
227,300
-15,800
| -6% | -$36.4K |
|
3397
iShares Russell 1000 Value ETF
IWD
$81.5B
| $562K | ﹤0.01% |
+3,040
| New | +$583K |
|
3398
CALL
Avery Dennison
AVY
$12.5B
| $561K | ﹤0.01% |
3,000
+2,100
| +233% | +$429K |
|
3399
CALL
Bio-Techne
TECH
$11.2B
| $561K | ﹤0.01% |
7,800
-2,400
| -24% | -$176K |
|
|
ETNB
3400
CALL
DELISTED
89bio
ETNB
| $560K | ﹤0.01% |
71,700
+12,300
| +21% | +$101K |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.