Warrants in 13Fs: OXY/WS, BAC Warrants Reading

Warrants periodically appear in 13F filings as separate line items distinct from underlying common stock. MFN Partners holds Occidental Petroleum warrants (OXY/WS) at $244 million and 5.11% portfolio weight. Berkshire Hathaway historically held Bank of America warrants from the 2011 $5 billion financing transaction, exercising them at substantial profit before 2017. Warrants in 13F filings represent long-dated leveraged equity exposure with distinctive structural characteristics that differ meaningfully from common stock positions. Reading warrant positions correctly requires understanding the original-financing context plus the long-dated optionality embedded in the security.

What are warrants in 13F context?

Warrants are long-dated equity-purchase rights typically issued by a company in connection with debt financing, preferred-stock issuance, or M&A consideration. The warrant gives the holder the right (but not the obligation) to purchase common stock at a specified strike price within a defined exercise window (often 5-10+ years). Three structural features distinguish warrants from common stock:

1. Leveraged exposure. Warrant value swings dramatically with underlying-stock price changes — gains and losses amplified versus direct common-stock ownership.
2. Time-decay sensitivity. Warrants lose value as expiration approaches if the underlying stock remains below strike. The optionality has decay similar to long-dated call options.
3. No dividend rights. Warrant holders don't receive dividends from the underlying common stock until they exercise.

Major warrant positions in US 13Fs

Occidental Petroleum warrants (OXY/WS)

Occidental warrants trace to Berkshire Hathaway's 2019 $10 billion convertible-preferred-stock financing for OXY's Anadarko acquisition. The warrants gave Berkshire the right to purchase 83.86 million OXY common shares at $59.62 strike with 2027 expiration. Various institutional holders also took position via OXY warrants in subsequent secondary-market activity. MFN Partners' 5.11% OXY/WS concentration reflects long-dated leveraged Occidental exposure with optionality on continued Berkshire support.

Bank of America warrants (historical)

Berkshire's 2011 $5 billion preferred-stock financing of Bank of America included warrants to purchase 700 million BAC common shares at $7.14 strike, expiring 2021. Berkshire exercised the warrants in 2017 at substantial profit, converting into the continuing common-stock position that now represents 10.38% of Berkshire's $274 billion portfolio. The transaction is the canonical example of warrant-leveraged value creation through bank-stress-cycle financing.

Other warrant structures

Various smaller-scale warrant positions appear across 13F filings reflecting:

• SPAC sponsor warrants: Sponsor-related equity-purchase rights from de-SPAC transactions.
• Distressed-debt-conversion warrants: Issued in bankruptcy emergence transactions.
• Strategic-investment warrants: Issued by acquired companies as part of M&A consideration.

How to identify warrants in 13F filings

Five fingerprints:

1. Ticker contains '/WS' or 'WS' suffix. Most US-listed warrants append '/WS' (warrants) to the underlying ticker (OXY/WS, BAC/WS historical).
2. Position appears alongside underlying common stock at the same filer. Warrant holders often also hold the underlying common stock; both lines appear in the 13F.
3. Position size correlates with original-financing transaction. Warrant positions trace back to specific debt-or-preferred-stock financings; the original transaction is identifiable.
4. Position has expiration date driving urgency. Approaching warrant expiration drives exercise-or-monetization decisions visible in 13F changes.
5. Concentrated position weight on warrant relative to common. When a filer holds the warrant at higher portfolio weight than the underlying common, the leveraged-exposure thesis is structural.

How to read warrant positions in 13Fs

Three rules:

Rule 1: Trace the warrant back to the original financing

Each warrant has an origin transaction (debt financing, preferred-stock issuance, M&A consideration). Reading the warrant position requires understanding the original financing — strike price, expiration date, anti-dilution provisions, exercise mechanics.

Rule 2: Watch for exercise vs hold decisions

Within 1-2 years of warrant expiration, institutional holders face exercise-or-monetization decisions. Watch for cross-position changes (warrant decline + common-stock increase = exercise; warrant decline alone = monetization).

Rule 3: Read warrant-and-common-stock as integrated exposureWhen a filer holds both the warrant and the underlying common stock, the combined exposure represents integrated leveraged equity positioning. MFN Partners holds OXY/WS at 5.11% portfolio plus presumably some OXY common stock — combined Occidental exposure is meaningfully larger than the warrant line alone.

What warrants reveal about institutional positioning

1. Original financing relationship. Warrants indicate the holder participated in a specific past financing transaction with the issuer, often signaling continued strategic alignment.
2. Long-dated leveraged exposure conviction. Concentrated warrant positions signal multi-year conviction in the underlying-stock-price trajectory.
3. Capital-allocation flexibility. Warrant exercise requires deploying additional capital to acquire common shares; the decision to exercise versus monetize signals the holder's capital-allocation flexibility plus equity-vs-cash preference.

For real-time tracking of warrant 13F positioning, see the institutional signals feed. For related reading on Berkshire's Bank of America position evolution, see our Berkshire compounder decoder.