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 | |
|---|---|---|---|---|---|---|
351
CALL
Corning
GLW
$133B
| $50.3M | 0.03% |
613,600
+150,700
| +33% | +$9.85M |
|
352
CALL
Etsy
ETSY
$7.64B
| $50M | 0.03% |
753,500
+299,900
| +66% | +$17.9M |
|
353
CALL
Honeywell
HON
$73.8B
| $50M | 0.03% |
251,881
+55,172
| +28% | +$11.5M |
|
354
PUT
TeraWulf
WULF
$9.66B
| $49.6M | 0.03% |
4,342,400
+1,669,100
| +62% | +$12.8M |
|
355
CALL
ServiceNow
NOW
$98.4B
| $49.3M | 0.03% |
268,000
-96,500
| -26% | -$18M |
|
356
PUT
NextEra Energy
NEE
$186B
| $49.1M | 0.03% |
650,900
+36,500
| +6% | +$2.67M |
|
357
CALL
Nu Holdings
NU
$70.1B
| $49.1M | 0.03% |
3,066,900
+396,200
| +15% | +$5.53M |
|
358
PUT
AT&T
T
$160B
| $48.8M | 0.03% |
1,726,500
-835,000
| -33% | -$23.7M |
|
359
CALL
Kraft Heinz
KHC
$30.8B
| $48.7M | 0.03% |
1,872,100
+400,400
| +27% | +$10.9M |
|
360
PUT
Rivian
RIVN
$24.9B
| $48.4M | 0.02% |
3,300,200
-589,000
| -15% | -$7.89M |
|
|
SCHW
361
PUT
Charles Schwab
SCHW
$175B
| $48.3M | 0.02% |
505,800
-35,300
| -7% | -$3.35M |
|
362
CALL
Shell
SHEL
$243B
| $48M | 0.02% |
671,000
+41,200
| +7% | +$2.97M |
|
363
PUT
Opendoor
OPEN
$4.23B
| $47.9M | 0.02% |
6,211,987
+5,754,427
| +1,258% | +$23.3M |
|
364
PUT
Procter & Gamble
PG
$347B
| $47.7M | 0.02% |
458,800
+173,900
| +61% | +$27.2M |
|
365
CALL
Intuitive Surgical
ISRG
$121B
| $47.5M | 0.02% |
106,200
+36,000
| +51% | +$17.3M |
|
366
PUT
CVS Health
CVS
$138B
| $47.3M | 0.02% |
627,000
-420,900
| -40% | -$28.8M |
|
367
CALL
Electronic Arts
EA
$52.4B
| $47M | 0.02% |
232,900
+100,200
| +76% | +$16.6M |
|
368
PUT
Datadog
DDOG
$87.5B
| $46.9M | 0.02% |
365,600
+94,700
| +35% | +$13M |
|
369
CALL
Philip Morris
PM
$303B
| $46.6M | 0.02% |
287,100
-114,200
| -28% | -$19.2M |
|
370
CALL
Affirm
AFRM
$24.8B
| $46.5M | 0.02% |
636,900
-42,100
| -6% | -$3.2M |
|
|
SCHW
371
CALL
Charles Schwab
SCHW
$175B
| $46.2M | 0.02% |
484,000
-151,600
| -24% | -$14.4M |
|
372
CALL
American Airlines Group
AAL
$9.78B
| $46.1M | 0.02% |
4,100,400
+1,045,000
| +34% | +$12.9M |
|
373
PUT
Valero Energy
VLO
$92.3B
| $46M | 0.02% |
270,300
+150,500
| +126% | +$22.4M |
|
374
CALL
Boston Scientific
BSX
$63.9B
| $45.7M | 0.02% |
468,100
+186,500
| +66% | +$19.3M |
|
375
PUT
FedEx
FDX
$76.6B
| $45.6M | 0.02% |
193,500
-5,500
| -3% | -$1.27M |
|
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.