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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
476
CALL
Pan American Silver
PAAS
$19.1B
| $31.7M | 0.02% |
818,200
+361,700
| +79% | +$11.6M |
|
|
ZVOL
477
PUT
Volatility Premium Plus ETF
ZVOL
$13.1M
| $31.4M | 0.02% |
472,700
+177,700
| +60% | +$2.2M |
|
478
PUT
Synopsys
SNPS
$72.3B
| $31.4M | 0.02% |
63,600
+38,300
| +151% | +$21.7M |
|
479
CALL
Futu Holdings
FUTU
$14.9B
| $31.4M | 0.02% |
180,300
-42,000
| -19% | -$6.98M |
|
480
CALL
Kroger
KR
$35.3B
| $31.2M | 0.02% |
462,300
+39,500
| +9% | +$2.75M |
|
481
PUT
RTX Corp
RTX
$262B
| $31.2M | 0.02% |
186,200
-66,500
| -26% | -$10.3M |
|
482
CALL
Estee Lauder
EL
$29.9B
| $31M | 0.02% |
351,600
-48,500
| -12% | -$4.32M |
|
483
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$22B
| $30.7M | 0.02% |
881,942
+365,982
| +71% | +$10.2M |
|
484
PUT
3M
MMM
$89.1B
| $30.5M | 0.02% |
258,700
+13,900
| +6% | +$2.14M |
|
485
PUT
Celsius Holdings
CELH
$7.28B
| $30.3M | 0.02% |
527,300
-348,800
| -40% | -$18.2M |
|
486
CALL
Gilead Sciences
GILD
$162B
| $30.1M | 0.02% |
271,100
-41,700
| -13% | -$4.74M |
|
487
CALL
T-Mobile US
TMUS
$207B
| $29.9M | 0.02% |
125,100
-124,200
| -50% | -$30.1M |
|
488
PUT
EQT Corp
EQT
$33.8B
| $29.9M | 0.02% |
548,900
+252,500
| +85% | +$13.3M |
|
489
PUT
Corning
GLW
$133B
| $29.8M | 0.02% |
363,700
+200,300
| +123% | +$13.1M |
|
|
490
PUT
T-Mobile US
TMUS
$207B
| $29.8M | 0.02% |
124,300
-38,600
| -24% | -$9.34M |
|
491
PUT
Sunrun
RUN
$2.61B
| $29.4M | 0.02% |
1,701,400
-827,700
| -33% | -$11.1M |
|
492
CALL
Amgen
AMGN
$198B
| $29.4M | 0.02% |
104,100
-5,900
| -5% | -$1.71M |
|
493
CALL
Oscar Health
OSCR
$8.89B
| $29.3M | 0.02% |
1,546,900
+688,100
| +80% | +$11.3M |
|
494
PUT
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$135M
| $29.2M | 0.02% |
623,600
+194,300
| +45% | +$4.13M |
|
495
PUT
Halliburton
HAL
$27.6B
| $29M | 0.01% |
1,178,400
+147,400
| +14% | +$3.26M |
|
496
CALL
XPeng
XPEV
$12.3B
| $29M | 0.01% |
1,237,200
-147,300
| -11% | -$2.96M |
|
497
CALL
Vanguard Consumer Discretionary ETF
VCR
$6.07B
| $28.9M | 0.01% |
40,200
+7,100
| +21% | +$2.7M |
|
498
CALL
KKR & Co
KKR
$85.8B
| $28.7M | 0.01% |
221,200
+41,700
| +23% | +$5.92M |
|
499
PUT
Proshares UltraShort Technology
REW
$3.3M
| $28.7M | 0.01% |
424,275
+72,000
| +20% | +$1.95M |
|
500
CALL
Take-Two Interactive
TTWO
$43.4B
| $28.7M | 0.01% |
110,900
+19,200
| +21% | +$4.54M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.