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 | |
|---|---|---|---|---|---|---|
1451
CALL
Zoetis
ZTS
$31.6B
| $5.03M | ﹤0.01% |
34,400
+14,200
| +70% | +$2.15M |
|
1452
PUT
Coeur Mining
CDE
$15.6B
| $5.02M | ﹤0.01% |
267,400
+126,200
| +89% | +$1.54M |
|
1453
NRG Energy
NRG
$29.8B
| $5M | ﹤0.01% |
30,856
-27,099
| -47% | -$4.22M |
|
1454
CALL
Enovix
ENVX
$862M
| $4.98M | ﹤0.01% |
499,700
-371,957
| -43% | -$4.12M |
|
1455
Vanguard Real Estate ETF
VNQ
$39.9B
| $4.98M | ﹤0.01% |
54,486
+27,709
| +103% | +$2.51M |
|
1456
CALL
Textron
TXT
$16.6B
| $4.98M | ﹤0.01% |
58,900
+43,300
| +278% | +$3.53M |
|
1457
PUT
SharkNinja
SN
$21B
| $4.97M | ﹤0.01% |
48,200
+4,600
| +11% | +$525K |
|
1458
CALL
Hawaiian Electric Industries
HE
$2.33B
| $4.97M | ﹤0.01% |
549,900
+437,000
| +387% | +$4.98M |
|
1459
PUT
T. Rowe Price
TROW
$25B
| $4.97M | ﹤0.01% |
48,400
+1,300
| +3% | +$137K |
|
1460
PUT
iShares Convertible Bond ETF
ICVT
$7.23B
| $4.97M | ﹤0.01% |
133,100
-40,100
| -23% | -$3.77M |
|
1461
PUT
Scorpio Tankers
STNG
$3.96B
| $4.97M | ﹤0.01% |
88,600
-13,600
| -13% | -$671K |
|
|
TGNA
1462
PUT
DELISTED
TEGNA Inc
TGNA
| $4.96M | ﹤0.01% |
244,200
+2,000
| +0.8% | +$38.1K |
|
1463
PUT
Canadian Pacific Kansas City
CP
$82B
| $4.96M | ﹤0.01% |
66,600
+13,900
| +26% | +$1.06M |
|
1464
CALL
Travere Therapeutics
TVTX
$5.33B
| $4.96M | ﹤0.01% |
207,500
+95,600
| +85% | +$1.8M |
|
1465
PUT
Ionis Pharmaceuticals
IONS
$9.35B
| $4.94M | ﹤0.01% |
75,500
+40,900
| +118% | +$2M |
|
1466
CALL
IQVIA
IQV
$34.7B
| $4.94M | ﹤0.01% |
26,000
-17,500
| -40% | -$3.18M |
|
1467
CALL
NextDecade
NEXT
$1.85B
| $4.93M | ﹤0.01% |
726,700
+651,300
| +864% | +$6.3M |
|
1468
PUT
Dynatrace
DT
$12.1B
| $4.93M | ﹤0.01% |
101,800
+10,600
| +12% | +$536K |
|
1469
CALL
Sysco
SYY
$39.7B
| $4.93M | ﹤0.01% |
59,900
-23,200
| -28% | -$1.86M |
|
1470
PUT
Arthur J. Gallagher & Co
AJG
$63.7B
| $4.92M | ﹤0.01% |
15,900
-300
| -2% | -$90.4K |
|
1471
PUT
GeneDx Holdings
WGS
$1.75B
| $4.92M | ﹤0.01% |
45,700
-48,300
| -51% | -$5.26M |
|
1472
CALL
Akamai
AKAM
$16.8B
| $4.92M | ﹤0.01% |
64,900
-109,600
| -63% | -$8.45M |
|
1473
CALL
Regions Financial
RF
$26.3B
| $4.92M | ﹤0.01% |
186,400
-25,900
| -12% | -$673K |
|
1474
PUT
SSR Mining
SSRM
$5.57B
| $4.92M | ﹤0.01% |
201,300
+22,800
| +13% | +$386K |
|
1475
CALL
Leidos
LDOS
$14.1B
| $4.91M | ﹤0.01% |
26,000
-28,800
| -53% | -$5.01M |
|
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.