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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3351
Equifax
EFX
$20.8B
| $522K | ﹤0.01% |
+2,855
| New | +$583K |
|
3352
Kyndryl
KD
$2.81B
| $522K | ﹤0.01% |
+34,599
| New | +$513K |
|
3353
Macerich
MAC
$7.41B
| $522K | ﹤0.01% |
47,916
-10,970
| -19% | -$131K |
|
3354
CALL
MakeMyTrip
MMYT
$4.97B
| $522K | ﹤0.01% |
12,900
+10,500
| +438% | +$364K |
|
3355
FLEX LNG
FLNG
$1.65B
| $521K | ﹤0.01% |
17,284
-10,759
| -38% | -$332K |
|
3356
Agios Pharmaceuticals
AGIO
$2.2B
| $519K | ﹤0.01% |
21,006
+9,552
| +83% | +$253K |
|
3357
PUT
Brookfield
BN
$103B
| $518K | ﹤0.01% |
29,850
-1,650
| -5% | -$37.2K |
|
|
ARI
3358
CALL
Apollo Commercial Real Estate
ARI
$876M
| $517K | ﹤0.01% |
51,100
+22,200
| +77% | +$242K |
|
3359
Denison Mines
DNN
$2.64B
| $516K | ﹤0.01% |
313,266
+228,504
| +270% | +$316K |
|
3360
Mercado Libre
MELI
$92.3B
| $516K | ﹤0.01% |
407
-7,602
| -95% | -$9.67M |
|
3361
ARK Web x.0 ETF
ARKW
$1.65B
| $515K | ﹤0.01% |
9,518
+9,458
| +15,763% | +$561K |
|
|
DOO
3362
CALL
Bombardier Recreational Products
DOO
$4.53B
| $515K | ﹤0.01% |
+6,800
| New | +$550K |
|
3363
PUT
Fox Factory Holding Corp
FOXF
$779M
| $515K | ﹤0.01% |
5,200
+3,900
| +300% | +$417K |
|
3364
CALL
Gartner
IT
$9.87B
| $515K | ﹤0.01% |
1,500
+700
| +88% | +$244K |
|
3365
CALL
Companhia Siderúrgica Nacional
SID
$1.49B
| $515K | ﹤0.01% |
215,500
-225,900
| -51% | -$579K |
|
3366
PUT
Fresenius Medical Care
FMS
$13.4B
| $514K | ﹤0.01% |
23,900
-3,200
| -12% | -$77.7K |
|
3367
PUT
Biomea Fusion
BMEA
$91.1M
| $513K | ﹤0.01% |
37,300
-18,700
| -33% | -$337K |
|
3368
PUT
Ryder
R
$10.3B
| $513K | ﹤0.01% |
4,800
+3,200
| +200% | +$311K |
|
3369
CALL
Trinity Industries
TRN
$2.95B
| $513K | ﹤0.01% |
21,100
+20,500
| +3,417% | +$517K |
|
3370
Vanguard Energy ETF
VDE
$9.87B
| $513K | ﹤0.01% |
4,049
+3,949
| +3,949% | +$483K |
|
3371
The GEO Group
GEO
$4.13B
| $512K | ﹤0.01% |
+62,602
| New | +$458K |
|
3372
Nasdaq
NDAQ
$52.5B
| $511K | ﹤0.01% |
10,518
-6,974
| -40% | -$353K |
|
3373
Navitas Semiconductor
NVTS
$2.78B
| $511K | ﹤0.01% |
73,543
-81,940
| -53% | -$725K |
|
3374
CALL
abrdn Physical Gold Shares ETF
SGOL
$6.97B
| $511K | ﹤0.01% |
28,900
+27,400
| +1,827% | +$505K |
|
3375
Global X Silver Miners ETF NEW
SIL
$4.09B
| $511K | ﹤0.01% |
21,414
+21,204
| +10,097% | +$551K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.