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 | |
|---|---|---|---|---|---|---|
451
CALL
Zscaler
ZS
$23B
| $34.5M | 0.02% |
115,100
-30,000
| -21% | -$8.55M |
|
452
PUT
Amgen
AMGN
$198B
| $34.4M | 0.02% |
121,900
+4,000
| +3% | +$1.16M |
|
453
PUT
Cigna
CI
$75.4B
| $34.4M | 0.02% |
119,300
+30,500
| +34% | +$9.02M |
|
454
Target
TGT
$62.6B
| $34.3M | 0.02% |
381,939
+272,045
| +248% | +$26.8M |
|
455
PUT
Boston Scientific
BSX
$63.9B
| $34M | 0.02% |
347,900
-80,500
| -19% | -$8.34M |
|
456
CALL
SLB Ltd
SLB
$71.3B
| $33.9M | 0.02% |
986,500
-142,500
| -13% | -$4.96M |
|
457
PUT
NuScale Power
SMR
$3B
| $33.8M | 0.02% |
938,600
-52,500
| -5% | -$2.09M |
|
458
CALL
ConocoPhillips
COP
$145B
| $33.6M | 0.02% |
355,400
-86,000
| -19% | -$8.13M |
|
459
CALL
Eos Energy Enterprises
EOSE
$1.41B
| $33.5M | 0.02% |
2,941,100
+127,600
| +5% | +$873K |
|
460
CALL
Royal Caribbean
RCL
$76.7B
| $33.5M | 0.02% |
103,500
-41,000
| -28% | -$13.7M |
|
461
CALL
Eaton
ETN
$158B
| $33.2M | 0.02% |
88,800
-50,000
| -36% | -$18.2M |
|
462
PUT
Albemarle
ALB
$13.9B
| $33.2M | 0.02% |
409,200
+108,600
| +36% | +$8.38M |
|
463
CALL
D-Wave Quantum
QBTS
$6.43B
| $33.2M | 0.02% |
1,342,500
-261,700
| -16% | -$4.77M |
|
464
CALL
Lowe's Companies
LOW
$115B
| $33.1M | 0.02% |
131,600
+16,100
| +14% | +$3.96M |
|
|
NVO
465
Novo Nordisk
NVO
$213B
| $33M | 0.02% |
595,602
+290,365
| +95% | +$17M |
|
466
Pfizer
PFE
$141B
| $33M | 0.02% |
1,296,490
+1,262,307
| +3,693% | +$31.2M |
|
467
CALL
Hewlett Packard
HPE
$63.7B
| $32.7M | 0.02% |
1,332,200
+57,900
| +5% | +$1.28M |
|
468
TSMC
TSM
$2.18T
| $32.6M | 0.02% |
116,776
-162,150
| -58% | -$39.7M |
|
469
CALL
Microchip Technology
MCHP
$46.2B
| $32.5M | 0.02% |
505,800
-240,000
| -32% | -$16.3M |
|
470
PUT
Invesco Aerospace & Defense ETF
PPA
$8.03B
| $32.4M | 0.02% |
176,400
+25,900
| +17% | +$3.81M |
|
|
IPFF
471
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $32.2M | 0.02% |
564,700
-31,900
| -5% | -$1.82M |
|
472
PUT
Abbott
ABT
$175B
| $32.2M | 0.02% |
240,200
+46,200
| +24% | +$6.06M |
|
473
CALL
Duolingo
DUOL
$5.57B
| $31.9M | 0.02% |
99,100
+83,400
| +531% | +$27.9M |
|
474
CALL
Lennar Class A
LEN
$19.8B
| $31.9M | 0.02% |
307,900
+116,000
| +60% | +$14.4M |
|
475
CALL
EQT Corp
EQT
$33.8B
| $31.7M | 0.02% |
582,400
+342,200
| +142% | +$18.1M |
|
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.