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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
301
CALL
Cerebras Systems
CBRS
$21.9B
| $37.6M | 0.02% |
211,600
+15,900
| +8% | +$3.2M |
2026 Q2
1 quarter
|
|
302
PUT
Astera Labs
ALAB
$37.6B
| $37.5M | 0.02% |
105,400
-119,400
| -53% | -$38.4M |
2024 Q1
10 quarters
|
|
303
CALL
NextEra Energy
NEE
$181B
| $37.4M | 0.02% |
493,700
+12,600
| +3% | +$1.07M |
2014 Q4
47 quarters
|
|
304
PUT
Delta Air Lines
DAL
$60.6B
| $37.4M | 0.02% |
447,800
-121,500
| -21% | -$10.3M |
2021 Q2
21 quarters
|
|
305
CALL
Morgan Stanley
MS
$293B
| $37M | 0.02% |
196,900
+35,500
| +22% | +$7.54M |
2014 Q4
47 quarters
|
|
306
PUT
Merck
MRK
$363B
| $36.9M | 0.02% |
253,700
+16,100
| +7% | +$2.22M |
2021 Q1
22 quarters
|
|
307
PUT
Rivian
RIVN
$19.8B
| $36.8M | 0.02% |
2,462,100
-252,400
| -9% | -$4.09M |
2021 Q4
19 quarters
|
|
308
PUT
Target
TGT
$73.2B
| $36.6M | 0.02% |
233,600
-60,000
| -20% | -$9.02M |
2021 Q2
21 quarters
|
|
309
PUT
Direxion Daily META Bear 1X ETF
METD
$8.21M
| $36.5M | 0.02% |
1,313,700
+915,600
| +230% | +$14.2M |
2024 Q2
9 quarters
|
|
310
CALL
Valero Energy
VLO
$97.3B
| $36.5M | 0.02% |
94,200
+600
| +0.6% | +$203K |
2014 Q4
47 quarters
|
|
311
CALL
Airbnb
ABNB
$110B
| $36.3M | 0.02% |
225,900
+16,400
| +8% | +$2.69M |
2020 Q4
23 quarters
|
|
312
PUT
Cipher Digital
CIFR
$2.93B
| $36.1M | 0.02% |
2,278,200
+823,900
| +57% | +$15.3M |
2023 Q1
14 quarters
|
|
313
CALL
JD.com
JD
$38.2B
| $35.7M | 0.02% |
1,343,000
-207,900
| -13% | -$6.03M |
2014 Q4
47 quarters
|
|
314
CALL
Coherent
COHR
$42.4B
| $35.7M | 0.02% |
124,000
+12,800
| +12% | +$3.84M |
2020 Q1
26 quarters
|
|
315
CALL
Amgen
AMGN
$251B
| $35.7M | 0.02% |
84,600
+43,200
| +104% | +$17.2M |
2021 Q2
21 quarters
|
|
316
CALL
T-REX 2X Long CRWV Daily Target ETF
CRWU
$7.32M
| $35.4M | 0.02% |
+896,900
| New | +$34M |
2026 Q3
0 quarters
|
|
317
CALL
Tempus AI
TEM
$14.6B
| $35.2M | 0.02% |
429,400
+1,000
| +0.2% | +$60.4K |
2024 Q2
9 quarters
|
|
318
PUT
Okta
OKTA
$31.1B
| $34.9M | 0.02% |
166,900
+20,600
| +14% | +$3.26M |
2021 Q2
21 quarters
|
|
319
CALL
IonQ
IONQ
$16.1B
| $34.9M | 0.02% |
794,700
+172,800
| +28% | +$7M |
2021 Q1
22 quarters
|
|
320
CALL
Barrick Mining
B
$65.7B
| $34.6M | 0.02% |
851,800
+64,600
| +8% | +$2.65M |
2021 Q2
21 quarters
|
|
321
PUT
Boston Scientific
BSX
$64.7B
| $34.5M | 0.02% |
790,200
+434,000
| +122% | +$20.1M |
2017 Q2
37 quarters
|
|
|
322
PUT
Valero Energy
VLO
$97.3B
| $34.2M | 0.02% |
88,300
+48,700
| +123% | +$16.4M |
2014 Q4
47 quarters
|
|
323
PUT
GameStop
GME
$12.7B
| $33.8M | 0.02% |
1,729,100
+584,800
| +51% | +$12.2M |
2021 Q2
21 quarters
|
|
|
324
PUT
Airbnb
ABNB
$110B
| $33.7M | 0.02% |
210,000
+27,100
| +15% | +$4.44M |
2020 Q4
23 quarters
|
|
325
PUT
Adobe
ADBE
$91.6B
| $33.6M | 0.02% |
139,900
-33,700
| -19% | -$8.44M |
2015 Q3
44 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.