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 | |
|---|---|---|---|---|---|---|
|
301
Pinduoduo
PDD
$119B
| $61.3M | 0.03% |
+463,452
| New | +$54.9M |
|
|
B
302
PUT
Barrick Mining
B
$62.8B
| $60.6M | 0.03% |
1,848,600
-128,300
| -6% | -$3.25M |
|
303
PUT
Caterpillar
CAT
$410B
| $60M | 0.03% |
147,500
+50,800
| +53% | +$21.7M |
|
304
CALL
Core Scientific
CORZ
$7.51B
| $60M | 0.03% |
3,343,000
-27,300
| -0.8% | -$400K |
|
305
PUT
Occidental Petroleum
OXY
$57.2B
| $59.7M | 0.03% |
1,457,300
-46,700
| -3% | -$2.11M |
|
306
Tesla
TSLA
$1.4T
| $59.5M | 0.03% |
+133,826
| New | +$46.4M |
|
307
PUT
Coca-Cola
KO
$354B
| $59.2M | 0.03% |
893,300
-217,300
| -20% | -$15M |
|
308
CALL
GE Aerospace
GE
$354B
| $59.2M | 0.03% |
196,700
-69,100
| -26% | -$18.9M |
|
309
CALL
Lyft
LYFT
$5.57B
| $58.9M | 0.03% |
2,676,500
+1,797,300
| +204% | +$30.1M |
|
310
CALL
Accenture
ACN
$85.7B
| $58.9M | 0.03% |
238,700
+68,800
| +40% | +$17.9M |
|
311
CALL
Airbnb
ABNB
$83.1B
| $58.9M | 0.03% |
484,700
+45,000
| +10% | +$5.82M |
|
312
CALL
IonQ
IONQ
$12.9B
| $58.8M | 0.03% |
956,700
+100,100
| +12% | +$4.71M |
|
313
CALL
Mastercard
MA
$470B
| $58.8M | 0.03% |
103,300
-22,800
| -18% | -$13.1M |
|
|
314
PUT
Mastercard
MA
$470B
| $58.5M | 0.03% |
102,800
-78,700
| -43% | -$45.2M |
|
315
CALL
General Motors
GM
$74.1B
| $58.1M | 0.03% |
953,300
+159,400
| +20% | +$8.89M |
|
316
PUT
Starbucks
SBUX
$119B
| $57.7M | 0.03% |
681,500
-122,600
| -15% | -$11M |
|
317
CALL
Centene
CNC
$32.5B
| $57.6M | 0.03% |
1,615,600
+1,566,900
| +3,217% | +$47.3M |
|
318
PUT
Warner Bros
WBD
$64.8B
| $57.6M | 0.03% |
2,949,100
+1,269,200
| +76% | +$17.3M |
|
319
CALL
Texas Instruments
TXN
$268B
| $57.5M | 0.03% |
313,000
+89,300
| +40% | +$17.5M |
|
320
PUT
Hewlett Packard
HPE
$63.7B
| $57.3M | 0.03% |
2,333,500
+1,069,500
| +85% | +$23.6M |
|
321
CALL
McDonald's
MCD
$187B
| $57.3M | 0.03% |
188,500
-90,900
| -33% | -$27.7M |
|
322
CALL
NextEra Energy
NEE
$186B
| $57M | 0.03% |
755,400
-644,200
| -46% | -$47.1M |
|
323
CALL
TeraWulf
WULF
$9.66B
| $56.8M | 0.03% |
4,976,000
+2,737,000
| +122% | +$20.9M |
|
|
XYZ
324
PUT
Block Inc
XYZ
$46.1B
| $56.8M | 0.03% |
785,900
-364,900
| -32% | -$27.3M |
|
325
PUT
Royal Caribbean
RCL
$76.7B
| $56.5M | 0.03% |
174,500
-2,300
| -1% | -$768K |
|
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.