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 | |
|---|---|---|---|---|---|---|
276
PUT
iShares Silver Trust
SLV
$28.8B
| $62.5M | 0.04% |
2,868,500
+726,500
| +34% | +$15.5M |
|
277
CALL
PNC Financial Services
PNC
$101B
| $62.4M | 0.04% |
402,700
+102,400
| +34% | +$13.3M |
|
278
PUT
Baidu
BIDU
$36.6B
| $62M | 0.04% |
520,500
+205,700
| +65% | +$23.8M |
|
279
PUT
Lennar Class A
LEN
$19.8B
| $61.3M | 0.04% |
424,976
+91,937
| +28% | +$11.1M |
|
280
PUT
Merck
MRK
$315B
| $61.2M | 0.04% |
561,000
-56,400
| -9% | -$5.85M |
|
281
PUT
Rivian
RIVN
$24.9B
| $61.1M | 0.04% |
2,605,200
-33,900
| -1% | -$637K |
|
282
CALL
Intuit
INTU
$77.8B
| $61M | 0.04% |
97,600
-15,200
| -13% | -$8.38M |
|
283
CALL
Cytokinetics
CYTK
$11.2B
| $61M | 0.04% |
730,600
+631,100
| +634% | +$22.9M |
|
284
PUT
Lowe's Companies
LOW
$115B
| $61M | 0.04% |
274,000
+7,200
| +3% | +$1.46M |
|
285
PUT
Blackrock
BLK
$164B
| $60.9M | 0.04% |
75,000
+3,100
| +4% | +$2.16M |
|
286
CALL
DexCom
DXCM
$27.6B
| $60.8M | 0.04% |
489,900
+137,700
| +39% | +$14.1M |
|
287
PUT
DraftKings
DKNG
$11.3B
| $60.4M | 0.04% |
1,714,500
-11,100
| -0.6% | -$371K |
|
288
CALL
First Solar
FSLR
$22.4B
| $60.3M | 0.04% |
350,000
-279,000
| -44% | -$42.7M |
|
289
CALL
RTX Corp
RTX
$262B
| $60.1M | 0.04% |
714,700
-403,200
| -36% | -$31.9M |
|
290
JD.com
JD
$40.7B
| $59.9M | 0.04% |
2,074,246
+1,033,637
| +99% | +$28M |
|
291
CALL
Snap
SNAP
$7.52B
| $59.5M | 0.04% |
3,515,900
+1,418,400
| +68% | +$17.4M |
|
292
CALL
Albemarle
ALB
$13.9B
| $59.3M | 0.04% |
410,400
+276,300
| +206% | +$37.9M |
|
293
CALL
Elevance Health
ELV
$84.4B
| $59.2M | 0.04% |
125,600
-1,200
| -0.9% | -$555K |
|
294
CALL
Upstart Holdings
UPST
$2.74B
| $59M | 0.04% |
1,442,900
+421,700
| +41% | +$12.8M |
|
295
PUT
NextEra Energy
NEE
$186B
| $58.6M | 0.04% |
1,161,600
+504,600
| +77% | +$28.8M |
|
296
CALL
Verizon
VZ
$185B
| $58.6M | 0.04% |
1,553,500
-258,800
| -14% | -$9.16M |
|
|
297
CALL
Merck
MRK
$315B
| $58.5M | 0.04% |
536,600
+27,500
| +5% | +$2.85M |
|
|
WBA
298
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $58.3M | 0.04% |
2,233,300
+1,220,800
| +121% | +$27.3M |
|
299
PUT
Sea Limited
SE
$64.2B
| $57.9M | 0.04% |
1,428,900
+441,800
| +45% | +$18M |
|
300
PUT
SLB Ltd
SLB
$71.3B
| $57.8M | 0.04% |
1,110,500
+159,100
| +17% | +$8.65M |
|
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.